CN105891250A - Method for determining original water saturation of tight sandstone reservoir - Google Patents
Method for determining original water saturation of tight sandstone reservoir Download PDFInfo
- Publication number
- CN105891250A CN105891250A CN201610192192.XA CN201610192192A CN105891250A CN 105891250 A CN105891250 A CN 105891250A CN 201610192192 A CN201610192192 A CN 201610192192A CN 105891250 A CN105891250 A CN 105891250A
- Authority
- CN
- China
- Prior art keywords
- sample
- target detection
- saturation
- full diameter
- plunger piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 95
- 239000012530 fluid Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 46
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 101
- 239000007789 gas Substances 0.000 claims description 75
- 239000011148 porous material Substances 0.000 claims description 61
- 238000005259 measurement Methods 0.000 claims description 30
- 238000004821 distillation Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000001307 helium Substances 0.000 claims description 10
- 229910052734 helium Inorganic materials 0.000 claims description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 10
- 239000003755 preservative agent Substances 0.000 claims description 8
- 230000002335 preservative effect Effects 0.000 claims description 8
- 240000000249 Morus alba Species 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 6
- 239000008398 formation water Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 235000008708 Morus alba Nutrition 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000002655 kraft paper Substances 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 65
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 238000000605 extraction Methods 0.000 description 10
- 239000011435 rock Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000005311 nuclear magnetism Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000012173 sealing wax Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000000867 larynx Anatomy 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- -1 porosity Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/082—Measurement of solid, liquid or gas content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a method for determining the original water saturation of a tight sandstone reservoir, which comprises the following steps: acquiring a sampling size and a target echo interval; sampling according to the sampling size to obtain a target test sample; performing nuclear magnetic resonance processing on the target test sample through the target echo interval to obtain the original liquid fluid saturation of the target test sample; distilling and extracting a target test sample to obtain the original oil saturation of the target test sample; the original water saturation of the target test sample is accurately obtained according to the original liquid fluid saturation and the original oil saturation, and the original water saturation of the target test sample can reflect the state of the tight sandstone reservoir most, so that the original water saturation of the target test sample is the original water saturation of the tight sandstone reservoir, the purpose of accurately determining the original water saturation of the tight sandstone reservoir is achieved, and a basis is provided for oil and gas reservoir evaluation and the like.
Description
Technical field
The present invention relates to Oil/Gas Reservoir Assessment technical field, particularly relate to that a kind of Sandstone Gas Reservoir is original contains
The determination method of water saturation.
Background technology
In oilfield exploitation procedure, need oil and gas reservoir is evaluated.Oil/Gas Reservoir Assessment technology is
Utilize the data of geology, drilling well, well logging and experimental analysis, to physical property, the lithology of oil and gas reservoir, preserve
Property, the spatial distribution of oil gas water, porosity, pore structure, permeability and original water saturation etc. are entered
Row research comprehensively and evaluation.Wherein, the determination of the original water saturation of reservoir is important in evaluating reservoir
One of content, is not only the needs of well logging saturation interpretation model scale, is also objective evaluation oil-gas geology
Reserves scale, the key of rational developing value.
At present in determining the method for water saturation of reservoir, distillation-extraction technique can effectively measure crude oil and
Formation water, utilizes the method to determine that initial oil and original water saturation have become petroleum industry and commonly used
Method；The method specifically utilizes the water in toluene solvant extracting core sample and oil, and water is with steam shape
Formula is distilled out, then is condensed in condensing trapping device, and readable water outlet and oil volume, finally combine
The actual measurement porosity of core sample calculates the initial oil saturation of this core sample and original aqueous respectively
Saturation.
Compared with conventional sandstone reservoir, Sandstone Gas Reservoir has that substrate is fine and close, pore throat is tiny and irreducible water
The features such as saturation is high, according to China's Sandstone Gas Reservoir geologic assessment standard (SY/T6832-2011),
Sandstone Gas Reservoir general porosity ＜ 10%, effective permeability ＜ 0.1mD, throat radius ＜ 1 μm.Cause
, there is the fine pore throat of larger proportion in this in Sandstone Gas Reservoir, it is relative that the oil of intrusion occupies radius
Bigger pore throat space, utilizes above-mentioned distillation-extraction technique can determine this Sandstone Gas Reservoir accurately
The volume of oil in core sample, initial condition then occupies the fine pore throat space that radius is relatively small, and
The relatively small fine pore throat quantity of radius is more, and irreducible water in this pore throat space is more difficult to be extracted completely
Go out；Therefore, use that above-mentioned distillation-extraction technique can not accurately measure in above-mentioned Sandstone Gas Reservoir original contains
Water volume, i.e. uses the distillation-extraction technique can not the original water saturation of Accurate Determining Sandstone Gas Reservoir.
Summary of the invention
The present invention provides the determination method of the original water saturation of a kind of Sandstone Gas Reservoir, to realize cause
The original water saturation of close sandstone reservoir is accurately measured.
The determination method of the original water saturation of a kind of Sandstone Gas Reservoir that the present invention provides, including:
Obtain sampling size and target echo interval；
Sample according to described sampling size, obtain target detection sample；
By described target echo interval, described target detection sample is carried out nuclear magnetic resonance, NMR process, to obtain
The original fluid liquid saturation of described target detection sample；
Described target detection sample is carried out distillation extracting, contains obtaining described the original of target detection sample
Oil saturation；
According to described original fluid liquid saturation and described initial oil saturation, obtain described target and survey
The original water saturation of test agent.
Method as above, described acquisition sampling size, including:
Obtaining full diameter sample and N number of standard plunger piston sample, wherein, described N >=2, described N is integer；
Obtain described full diameter sample and the original water saturation of each described standard plunger piston sample and reality respectively
Gaging hole porosity；
Target criteria plunger sample, wherein, described target mark is determined in described N number of standard plunger piston sample
Quasi-plunger sample is original water saturation and described full diameter sample in described N number of standard plunger piston sample
The sample that the difference of original water saturation is minimum；
Determine a length of described sampling size of described target criteria plunger sample.
Method as above, the full diameter sample of described acquisition and N number of standard plunger piston sample, specifically include:
Under liquid nitrogen environment, obtain described full diameter sample and described N number of standard plunger piston sample.
Method as above, the full diameter sample of described acquisition and N number of standard plunger piston sample, including:
From Sandstone Gas Reservoir, core sample, wherein, described oil base mud is drilled through under the conditions of oil-base mud
In slurry, the mass ratio of oil and water is more than or equal to 80:20；
Utilize diesel oil that described core sample is carried out, is dried；
Core sample after drying carries out 6 layers of parcel the most successively, and described 6 layers of parcel include:
Ground floor parcel preservative film, second layer parcel mulberry paper, third layer parcel preservative film, the 4th layer of parcel Mulberry
Mulberry paper, layer 5 parcel masking foil, layer 6 parcel kraft paper；
Core sample after parcel is carried out encapsulation process；
To described carry out encapsulation process after core sample cut, with obtain described full diameter sample and
Described N number of standard plunger piston sample.
Method as above, described obtains described full diameter sample and each described standard plunger piston sample respectively
Original water saturation, including:
In preset duration, described full diameter sample and each described standard plunger piston sample are carried out distillation extracting,
To obtain described full diameter sample and the aqueous volume of each described standard plunger piston sample respectively；
Full diameter sample after described distillation extracting and each standard plunger piston sample are filled helium process, to divide
Do not obtain described full diameter sample and the total pore volume of each described standard plunger piston sample；
Aqueous volume and the total pore volume of described full diameter sample according to described full diameter sample obtain institute
State the original water saturation of full diameter sample；
Aqueous volume and the hole of each described standard plunger piston sample according to each described standard plunger piston sample are overall
The long-pending original water saturation obtaining each described standard plunger piston sample.
Method as above, described obtains described full diameter sample and each described standard plunger piston sample respectively
Actual measurement porosity, including:
Obtain described full diameter sample and the apparent volume of each described standard plunger piston sample；
Total pore volume according to described full diameter sample and the apparent volume of described full diameter sample, obtain
The actual measurement porosity of described full diameter sample；
Total pore volume according to each described standard plunger piston sample and the appearance body of each described standard plunger piston sample
Long-pending, obtain the actual measurement porosity of each described standard plunger piston sample.
Method as above, described acquisition target echo is spaced, including:
Determining M echo sounding to be selected, wherein, described M >=2, described M is integer；
It is utilized respectively each described echo sounding to be selected described target criteria plunger sample is carried out at nuclear magnetic resonance, NMR
Reason, to obtain described target criteria plunger sample M porosity under each described echo sounding to be selected；
In described M echo sounding to be selected, determine that target echo is spaced, wherein, described target criteria post
Fill in the actual measurement hole of sample porosity under described target echo is spaced and described target criteria plunger sample
The difference of degree, less than any one in addition to being spaced except described target echo of described target criteria plunger sample
The difference of the actual measurement porosity of the porosity under echo sounding to be selected and described target criteria plunger sample.
Method as above, described determine M echo sounding to be selected before, also include:
Described target criteria plunger sample is carried out saturated formation water process.
Method as above, described target detection sample is carried out by described interval by described target echo
Nuclear magnetic resonance, NMR processes, to obtain the original fluid liquid saturation of described target detection sample, including:
By described target echo interval, described target detection sample is carried out nuclear magnetic resonance, NMR process, obtain institute
State target detection sample hole in original fluid liquid volume；
In described target detection sample, inject helium, obtain in the hole of described target detection sample not by
The pore volume that described original fluid liquid is filled；
According to described original fluid liquid volume and the described pore-body do not filled by described original fluid liquid
Long-pending, obtain the total pore volume of described target detection sample；
According to described original fluid liquid volume and described total pore volume, obtain described target detection sample
Original fluid liquid saturation.
Method as above, described carry out described target detection sample distills extracting, described to obtain
The initial oil saturation of target detection sample, including:
Described target detection sample is carried out distillation extracting, obtains in the hole of described target detection sample
Oil volume；
According to described oil volume and the total pore volume of described target detection sample, determine described target detection
The initial oil saturation of sample.
The determination method of the original water saturation of Sandstone Gas Reservoir of the present invention, first obtains sampling size
And target echo interval, sample according to sampling size, obtain and can represent Sandstone Gas Reservoir state
Target detection sample；By the target echo interval obtained, target detection sample is carried out at nuclear magnetic resonance, NMR
Reason, obtains the original fluid liquid saturation of target detection sample；Target detection sample is carried out distillation take out
Carry, to obtain the initial oil saturation of target detection sample；Then according to original fluid liquid saturation
And initial oil saturation, thus accurately obtain the original water saturation of target detection sample；Due to profit
The oil content extracted in the Sandstone Gas Reservoir surveyed with distillation is accurately, the original liquid flow that will obtain
Body saturation and initial oil saturation are subtracted each other, and i.e. can get the original water saturation of target detection sample,
Can reflect the state of Sandstone Gas Reservoir due to target detection sample, therefore target detection sample is original
Water saturation is the original water saturation of Sandstone Gas Reservoir, it is achieved thereby that Accurate Determining is fine and close
The purpose of the original water saturation of sandstone reservoir, provides foundation for Oil/Gas Reservoir Assessment etc..
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that under,
Accompanying drawing during face describes is some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The determination embodiment of the method one of the original water saturation of Sandstone Gas Reservoir that Fig. 1 provides for the present invention
Schematic flow sheet；
The determination embodiment of the method two of the original water saturation of Sandstone Gas Reservoir that Fig. 2 provides for the present invention
Schematic flow sheet；
Fig. 3 shows for the structure of the full diameter sample provided in the embodiment of the present invention and three standard plunger piston samples
It is intended to；
Fig. 4 satisfies for three the standard plunger piston samples provided in the embodiment of the present invention and the aqueous of full diameter sample
Comparison diagram with degree；
Fig. 5 is carried out under different echo soundings for the target criteria plunger sample provided in the embodiment of the present invention
Nuclear magnetic resonance, NMR processes porosity and the target criteria plunger sample of T2 spectrogram comparison diagram and the acquisition obtained
Actual measurement porosity comparison diagram；
Fig. 6 uses different echo sounding for the 20 pieces of target criteria plunger samples provided in the embodiment of the present invention
Carry out the contrast that nuclear magnetic resonance, NMR processes the actual measurement porosity of porosity and the target criteria plunger sample obtained
Figure.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with this
Accompanying drawing in bright embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention,
Obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
In oilfield exploitation procedure, need oil and gas reservoir is evaluated.Wherein, oil and gas reservoir is former
Beginning water saturation is one of important content of evaluating reservoir.Distillation-extraction technique is for really in prior art
Initial oil and the common method of original water saturation in permanent rule sandstone reservoir.The method is the most sharp
With the water in the core sample of toluene solvant extracting conventional sandstone reservoir and oil, then by water therein to steam
Gas form is distilled out, then is condensed in condensing trapping device, and readable water outlet and oil volume, finally
Actual measurement porosity in conjunction with core sample calculates the initial oil saturation of this core sample and original respectively
Water saturation.
And compared with conventional sandstone reservoir, Sandstone Gas Reservoir has substrate densification, pore throat is tiny and fetters
The features such as water saturation is high, according to China's Sandstone Gas Reservoir geologic assessment standard (SY/T6832-2011),
Sandstone Gas Reservoir general porosity ＜ 10%, effective permeability ＜ 0.1mD, throat radius ＜ 1 μm.Cause
, there is the fine pore throat of larger proportion in this in Sandstone Gas Reservoir, it is relative that the oil of intrusion occupies radius
Bigger pore throat space, utilizes the distillation-extraction technique of prior art can determine this tight sand accurately
The volume of oil in the core sample of reservoir, it is empty that initial condition then occupies the relatively small fine pore throat of radius
Between, and the relatively small fine pore throat quantity of radius is more, the irreducible water in this pore throat space is more difficult completely
Extracted.Therefore, the distillation-extraction technique of prior art is used accurately not measure in Sandstone Gas Reservoir
Original aqueous volume, i.e. can not the original water saturation of Accurate Determining Sandstone Gas Reservoir.
In order to solve this problem, the present invention can represent the mesh of rock core original fluid liquid state by obtaining
Mapping test agent, and determine the target echo interval that can reflect rock core pore throat bulk, utilize nuclear-magnetism
Resonance processes, it is thus achieved that this target detection sample original fluid liquid saturation under this target echo is spaced.
Then the initial oil amount of this target detection sample is accurately obtained by distillation-extraction technique, to obtain this target
The initial oil saturation of test sample, by saturated for original fluid liquid saturation and the initial oil obtained
Degree subtracts each other the original water saturation that i.e. can determine that target detection sample, due to this target detection sample
The original fluid liquid state of Sandstone Gas Reservoir, therefore, the target detection sample obtained can be represented
Original water saturation is the original water saturation of this Sandstone Gas Reservoir, it is achieved thereby that the most true
Determine the purpose of the original water saturation of Sandstone Gas Reservoir.
The determination method of specific embodiment water saturation original to Sandstone Gas Reservoir is used to carry out below
Describe in detail.
The determination method of the original water saturation of Sandstone Gas Reservoir that Fig. 1 provides for the embodiment of the present invention
Schematic flow sheet.Referring to the drawings shown in 1, the method for the present embodiment includes:
S101, acquisition sampling size and target echo interval；
S102, sample according to sampling size, obtain target detection sample；
S103, by target echo interval target detection sample is carried out nuclear magnetic resonance, NMR process, to obtain mesh
The original fluid liquid saturation of mapping test agent；
S104, target detection sample is carried out distillation extracting, to obtain the initial oil of target detection sample
Saturation；
S105, according to original fluid liquid saturation and initial oil saturation, obtain target detection sample
Original water saturation.
Specifically, before reality is tested, from Sandstone Gas Reservoir, some core samples are drilled through, from those
The sample determining the original fluid liquid state that can represent this Sandstone Gas Reservoir in core sample is optimum
Sample, the length of this optimum sample is sampling size, such as, as a length of 4cm of optimum sample,
Sampling size is 4cm, can meet actual test equipment, test condition and manually-operated requirement,
The architectural feature such as the water saturation of reservoir core, fluid liquid saturation can be accurately reflected again.
Echo sounding is that core sample carries out nuclear magnetic resonance, NMR (Nuclear Magnetic Resonance, letter
Claim NMR) process time required setting test parameter.Owing to the internal pore throat of Sandstone Gas Reservoir rock core is thin
Little and anisotropism is very strong, causes the pore throat size distribution precision that different echo sounding tests obtains not
With.Target echo interval refer to the inner structural features of core sample that tests out under this echo sounding with
The actual prototype structure feature of Sandstone Gas Reservoir is closest.
When needing the original water saturation of certain Sandstone Gas Reservoir is measured, according to determine
Sampling size is sampled from this Sandstone Gas Reservoir, and what sampling obtained is target detection sample, will
This target detection sample carries out nuclear magnetic resonance, NMR process under target echo is spaced, thus obtains this target detection
The original fluid liquid saturation of sample, obtains this target detection sample by distillation-extraction technique the most again
Oil saturation.Specifically can be accomplished by: be spaced target detection sample by target echo
Product carry out nuclear magnetic resonance, NMR process, obtain target detection sample hole in original fluid liquid volume, so
Backward target detection sample injects helium, obtains in the hole of target detection sample not by original liquid flow
The pore volume that body is filled.According to original fluid liquid volume and the hole do not filled by original fluid liquid
Volume, obtains the total pore volume of target detection sample.Overall according to original fluid liquid volume and hole
Long-pending, obtain the original fluid liquid saturation of target detection sample.Target detection sample is carried out distillation take out
Carry, obtain the oil volume in the hole of target detection sample.According to oil volume and the hole of target detection sample
Gap cumulative volume, determines the initial oil saturation of target detection sample.By acquired original fluid liquid
Saturation deducts the original water saturation that initial oil saturation is exactly target detection sample, due to target
Test sample can represent the state of Sandstone Gas Reservoir, therefore, and this target detection sample original aqueous
Saturation is exactly the original water saturation of Sandstone Gas Reservoir.
The determination method of the original water saturation of Sandstone Gas Reservoir of the present embodiment, first obtains sampling chi
Very little and target echo interval, samples according to sampling size, obtains and can represent Sandstone Gas Reservoir shape
The target detection sample of state；By the target echo interval obtained, target detection sample is carried out nuclear magnetic resonance, NMR
Process, obtain the original fluid liquid saturation of target detection sample；Target detection sample is distilled
Extracting, to obtain the initial oil saturation of target detection sample；Then saturated according to original fluid liquid
Degree and initial oil saturation, thus accurately obtain the original water saturation of target detection sample；Due to
The oil content utilizing distillation to extract in the Sandstone Gas Reservoir surveyed is accurately, the original liquid that will obtain
Fluid saturation and initial oil saturation are subtracted each other, and i.e. can get the original containing water saturation of target detection sample
Degree, owing to target detection sample is the state that can reflect Sandstone Gas Reservoir, therefore target detection sample
Original water saturation be the original water saturation of Sandstone Gas Reservoir, it is achieved thereby that accurately survey
Determine the purpose of the original water saturation of Sandstone Gas Reservoir, provide foundation for Oil/Gas Reservoir Assessment etc..
On the basis of embodiment illustrated in fig. 1, sampling chi can be obtained by the most feasible implementation
Very little (S101 in embodiment illustrated in fig. 1), concrete, shown in Figure 2 embodiment.
S201, obtain full diameter sample and N number of standard plunger piston sample；Wherein, N >=2, N is integer；
S202, obtain full diameter sample and the original water saturation of each standard plunger piston sample and actual measurement respectively
Porosity；
S203, in N number of standard plunger piston sample, determine target criteria plunger sample；
Wherein, the original water saturation of target criteria plunger sample is satisfied with the original aqueous of full diameter sample
With degree difference, less than in N number of standard plunger piston sample except target criteria plunger sample in addition to any one mark
The original water saturation of quasi-plunger sample and the difference of the original water saturation of full diameter sample；Namely
Saying, target criteria plunger sample is original water saturation and full diameter sample in N number of standard plunger piston sample
The minimum sample of the difference of original water saturation；
S204, determine a length of sampling size of target criteria plunger sample.
In S201, under the conditions of oil-base mud, from Sandstone Gas Reservoir, drill through core sample, oil base mud
In slurry, the mass ratio of oil and water is more than or equal to 80:20.Utilize diesel oil that core sample is carried out, wipe
Dry.Then core sample after drying carries out 6 layers of parcel the most successively, and 6 layers of parcel include:
Ground floor parcel preservative film, second layer parcel mulberry paper, third layer parcel preservative film, the 4th layer of parcel Mulberry
Mulberry paper, layer 5 parcel masking foil, layer 6 parcel kraft paper.And the core sample after parcel is carried out
Encapsulation process.By the core sample after carrying out encapsulation process is cut, full diameter sample just can be obtained
Product and N number of standard plunger piston sample.Such as, one piece of above-mentioned processed good core sample is cut into from centre
Two sections, wherein one section can be understood as full diameter sample.To another section then according to petroleum industry specification, from
The outer surface of another section is to quickly drilling through N number of sample inside it, and this N number of sample is standard plunger piston sample.
Optionally, obtain full diameter sample and N number of standard plunger piston sample is all carried out under liquid nitrogen environment.
In S202, full diameter sample and standard plunger piston sample can be obtained by the most feasible implementation
The original water saturation of product is concrete:
In preset duration, the full diameter sample obtained and each standard plunger piston sample are carried out distillation extracting, with
Obtain full diameter sample and the aqueous volume of each standard plunger piston sample respectively.Preset duration herein refers to
Required time, example all can be proposed water in the hole of full diameter sample and standard plunger piston sample
As, this preset duration is two weeks.Full diameter sample after distillation extracting and each standard plunger piston sample are carried out
Washing oil, the desalinization of soil by flooding or leaching and drying and processing.Then full diameter sample and each standard plunger piston sample fill helium process,
To obtain full diameter sample and the total pore volume of each standard plunger piston sample respectively.Thus according to full diameter sample
The aqueous volume of product and the total pore volume of full diameter sample obtain the original containing water saturation of full diameter sample
Degree, obtains each according to the aqueous volume of each standard plunger piston sample and the total pore volume of each standard plunger piston sample
The original water saturation of standard plunger piston sample.
The original water saturation of each standard plunger piston sample obtained and the original aqueous of full diameter sample are satisfied
Comparing with degree, in each standard plunger piston sample, which original water saturation and full diameter sample is former
Beginning water saturation is closest, then this corresponding standard plunger piston sample is defined as target criteria plunger sample.
Further, in S202, can by the most feasible implementation obtain full diameter sample and
The actual measurement porosity of standard plunger piston sample, concrete:
First full diameter sample and the apparent volume of each standard plunger piston sample are obtained, such as by slide calliper rule method pair
Full diameter sample and each standard plunger piston sample measure the apparent volume obtaining each sample.Then according to complete
The apparent volume of diameter sample and the total pore volume of the full diameter sample of above-mentioned acquisition, obtain full diameter sample
The actual measurement porosity of product.Apparent volume according to each standard plunger piston sample and each standard plunger piston of above-mentioned acquisition
The total pore volume of sample, obtains the actual measurement porosity of each standard plunger piston sample.
In this kind of feasible implementation, accordingly, can be determined by the most feasible implementation
Target echo interval in S101, concrete:
The target criteria plunger sample determined is carried out saturated formation water process.Determine between M echo to be selected
Every, wherein M >=2, M is integer.After determining echo sounding to be selected, it is utilized respectively between each echo to be selected
Every target criteria plunger sample is carried out nuclear magnetic resonance, NMR process, respectively treating obtaining target criteria plunger sample
Select M porosity under echo sounding, in M echo sounding to be selected, determine that target echo is spaced,
Wherein, this target criteria plunger sample porosity under described target echo is spaced and described target criteria
The difference of the actual measurement porosity of plunger sample, less than described target criteria plunger sample except described target echo
Porosity under any one outside interval echo sounding to be selected and the reality of described target criteria plunger sample
The difference of gaging hole porosity.It is to say, by M porosity obtaining one by one with this target mark of above-mentioned acquisition
The actual measurement porosity that quasi-plunger sample is corresponding contrasts, which porosity and the reality of target criteria plunger sample
Gaging hole porosity is closest, determines that the echo sounding that this porosity is corresponding is target echo interval.
Below, by a concrete example, the method shown in Fig. 1-Fig. 2 embodiment is described in detail.
Exemplary, as a example by A gas field, A gas field belongs to inverse thrust-faulted anticline type dry gas reservoir, and gas reservoir has
Multiple fault blocks form, and single gas reservoir amplitude is big, typically at 400m-600m.A gas field reservoir belongs to fine and close
Sandstone reservoir, its origin cause of formation belongs to braided river delta front sand body, belongs to buried type low hole Fractured fine and close
Sandstone reservoir, this Sandstone Gas Reservoir buried depth is big, and about at 6500m-8000m, thickness is huge, about
At 300m-320m, substrate is fine and close, and porosity is 3～7%, matrix permeability ＜ 0.1mD, A gas field
The porosity type of reservoir has intergranular corrosion hole, remaining intergranular pore and micropore etc., has macropore by size
Gap and fine pore, above-mentioned macrovoid and fine pore proportion are close, and the venturi type of A gas field reservoir is
Narrow lamellar throat, throat radius ＜ 0.5 μm.
Existing equipment is used to drill through representative under the conditions of oil-base mud from the reservoir of above-mentioned A gas field
Some core samples, wherein, in oil-base mud, the mass ratio of oil and water is more than or equal to 80:20, uses this ratio
The oil-base mud of example, reaches the impact reducing secondary water as far as possible to the initial moisture content of core sample, will
Core barrel takes to ground, for preventing from causing mud to penetrate in core sample due to capillary force effect, this
Time removal of core sample carry out pretreatment at once: rapid diesel oil is clean by the surface clean of core sample,
And dry rapidly the surface of each core sample, it is to avoid above-mentioned core sample is exposed to mud or air for a long time
In, it is ensured that core sample keeps original fluid state, makes core sample can represent the truth on stratum.
Core sample after drying wraps up, and initially with preservative film, core sample is carried out ground floor parcel,
Use mulberry paper to carry out second layer parcel again, then use preservative film to carry out third layer parcel, then use Cortex Mori
Paper carries out the 4th layer of parcel, then uses masking foil to carry out layer 5, finally uses kraft paper to carry out layer 6
Parcel.Evaporation loss and the liquid that can reduce fluid liquid in core sample is processed by above-mentioned six layers of parcel
Mobile.Then keep sealing by the core sample wrapped, such as, the core sample wrapped is carried out
Sealing wax processes.The core sample sealed is positioned over low temperature environment preserve to guarantee that core sample sealing wax does not melts
Changing, moisture does not evaporates, and keeps the original fluid state of core sample.Above-mentioned core sample pretreatment is tied
Shu Hou, preserves stand-by.
Fluid in above-mentioned core sample mainly has three classes, and a class can keep original underground state relatively
Original aqueous, another two classes are owing to drilling through core sample and pretreatment core sample under the conditions of oil-base mud
Time be contaminated and the oil that invades and gas, above-mentioned oil is gentle owing to being that Final pollution thing is brought into, not
Original underground fluid state can be reflected；Therefore, the oil that the present embodiment is only paid close attention to invade is gentle occupied
Space proportion, whether oil gentle can reflect that rock core underground fluid state does not affect this experimentation.
From the core sample that above-mentioned preservation is stand-by, select 20 pieces of representative core samples, mark respectively
It is designated as F1-F20, takes F1 therein, under liquid nitrogen environment, remove the wrappage of F1, F1 is truncated into two sections,
It is respectively labeled as FD1 and FD2, according to petroleum industry specification from the outer surface of FD1 to its internal quick drill
Taking length and be respectively the standard plunger piston sample of 2cm, 3cm and 4cm the most 3., Fig. 3 is the embodiment of the present invention
The full diameter sample of middle offer and the structural representation of three standard plunger piston samples, referring to the drawings shown in 3,
The length of the standard plunger piston sample drilled through can be determined according to the diameter of rock core and practical experience, it is possible to choosing
Length 1cm or 5,6cm.Closer to the length of core diameter, the original fluid state of rock core more can be embodied,
The present embodiment according to the diameter of rock core, test equipment, test request and practical experience, select to drill through 2cm,
The standard plunger piston sample of 3cm and 4cm.The FD2 of another section maintains rock as full diameter sample, FD2
The original fluid state of heart sample, is used for the original fluid shape being had with above three standard plunger piston sample
State contrasts.
Owing to A gas field reservoir belongs to tight sand, its pore throat is tiny, and original aqueous tax to there is radius inclined
In little pore throat, it is difficult to clean for water extracting in the short time, therefore, diameter sample complete to FD2 and above-mentioned
Three standard plunger piston samples carry out the distillation extractive process of two weeks by a definite date respectively, utilize toluene solvant gradually will
Water in core sample extracts, and obtains water content in relatively accurate each sample, reads FD2 the most straight
Footpath sample and the aqueous volume of three standard plunger piston samples.
Then diameter sample complete to the FD2 losing water and three standard plunger piston samples carry out washing oil, the desalinization of soil by flooding or leaching
And drying and processing.Now, in the hole of the full diameter sample of FD2 and three standard plunger piston sample interior without
Fluid liquid, hole is in " empty " state, injects appropriate helium to the full diameter sample of FD2, by
There is equipment to record the total pore volume of the full diameter sample of FD2, record the full diameter sample of FD2 by slide calliper rule method
Apparent volume, by being calculated the actual measurement porosity of the full diameter sample of FD2.Equally, to three marks
Quasi-plunger sample carries out aforesaid operations respectively, respectively obtain three standard plunger piston samples total pore volume and
Actual measurement porosity, does not calculate the full diameter sample of FD2 and three according to total pore volume and water content integration
The original water saturation of standard plunger piston sample.Other core samples F2-F20 uses the behaviour identical with F1
Record respective original water saturation, and record data, by FD2 corresponding for 20 parts of core samples
The original water saturation of full diameter sample and three standard plunger piston samples makes block diagram contrast.Fig. 4 is
Three the standard plunger piston samples provided in the embodiment of the present invention and the contrast of the water saturation of full diameter sample
Figure.Referring to the drawings shown in 4, existing only with the original water saturation according to core sample F1, F2 and F3
Illustrate as a example by block diagram prepared by data, it is evident that length in core sample F1, F2 and F3
Test result for the standard plunger piston sample test result diameter sample complete with FD2 3. of 4cm more connects
Closely, relative error is less than 3%.And the standard plunger piston sample of 2cm and 3cm and the full diameter sample of FD2
Water saturation deviation is relatively big, and relative error is more than 20%.The survey of other 17 pieces of full-hole core samples
Examination process is identical with above-mentioned test process, and test result is close, not shown in figure.From above-mentioned contrast,
Actual test equipment, test condition can be met as a length of 4cm of standard plunger piston sample and manually grasp
The requirement made, again closest to the original fluid state of full-hole core sample.The above-mentioned 4cm's filtered out
Standard plunger piston sample actual measurement porosity 3. is 5.4%, and the sample with this sampling size can accurately reflect out
The architectural features such as the water saturation of A gas field reservoir core, fluid liquid saturation and porosity.Therefore,
Using this standard plunger piston sample 3. as target criteria plunger sample, using this length 4cm as sampling size.
The optimum sample that above-mentioned hole is " empty " state is carried out saturated formation water, makes target plunger sample
Hole in again filled by water and reach saturation to carry out nuclear magnetic resonance scanning.To above-mentioned the heaviest
The most saturated target criteria plunger sample carries out nuclear magnetic resonance scanning, and the echo sounding of employing is 0.2ms, surveys
The porosity obtaining target criteria plunger sample is 5.5%, with the actual measurement porosity of target criteria plunger sample
5.4% difference 0.1.Using echo sounding again is that 0.6ms carries out nuclear magnetic resonance, NMR to target criteria plunger sample and sweeps
Retouching, the porosity recording target criteria plunger sample is 4.5%, differs 0.9 with gaging hole porosity in fact.With
Reason, using echo sounding is that to record the porosity of target criteria plunger sample be 4.2% to 1.2ms, with actual measurement
Porosity difference 1.2.Fig. 5 for the target criteria plunger sample that provides in the embodiment of the present invention between different echoes
Carry out nuclear magnetic resonance, NMR under every and process the T2 spectrogram comparison diagram and the porosity of acquisition and target criteria obtained
The comparison diagram of the actual measurement porosity of plunger sample.Referring to the drawings shown in 5, from T2 spectrogram it can be seen that
0.6ms with 1.2ms spectrogram is more or less the same, but both are relatively big with 0.2ms spectrum form difference, due to
Nuclear-magnetism relaxation time has good dependency, therefore from 0.2ms and 0.6ms with the pore throat size of rock core
Spectrogram difference it can be seen that the echo sounding of more than 0.6ms can not preferably reflect target criteria plunger
Sample part is less than the fine of 1ms relaxation time less than the fine pore throat in 10ms relaxation time and major part
Pore throat, result in more than 0.6ms echo sounding mensuration nuclear-magnetism porosity less than normal than actual measurement porosity.Other
The target criteria plunger sample selected in sample is also adopted by same test process, obtains similar conclusion, in figure
Not shown.Fig. 6 uses different echo for the 20 pieces of target criteria plunger samples provided in the embodiment of the present invention
What interval carried out that nuclear magnetic resonance, NMR processes the porosity and the target criteria plunger sample that obtain surveys the right of porosity
Than figure, referring to the drawings shown in 6, it can be seen that 0.2ms echo sounding measures porosity and actual measurement porosity
Being more or less the same, it is less than normal compared with actual measurement porosity that 0.6ms and 1.2ms echo sounding measures porosity.
Wherein, echo sounding can be set by practical situation and requirement, it is also possible to be 0.4ms, 0.8ms and
1.0ms etc., the present embodiment have selected according to the architectural feature of actual rock core and the practical situation of experimental facilities
0.2ms, 0.6ms and 1.2ms.Therefore, as seen from the above comparison, be 0.2ms using echo sounding as
The target echo of nuclear magnetic resonance scanning can reflect when being spaced that the pore throat of A gas field reservoir core is empty more accurately
Between size, in order to the architectural features such as the porosity of core sample and water saturation are accurately measured.
The sampling of the core sample that can represent A gas field reservoir original fluid state has been obtained by above-mentioned experimentation
Size and the target echo interval used time it is carried out nuclear magnetic resonance scanning.
Then under the conditions of liquid nitrogen, according to petroleum industry specification, sealing is preserved stand-by core sample the fastest
Speed drills through new core sample, using the standard plunger piston sample of freshly prepd for weight 20 a length of 4cm as
Target detection sample, utilizes target echo interval 0.2ms that above-mentioned 20 target detection samples are carried out nuclear-magnetism
Resonance scan, records original fluid liquid volume in the hole of all target detection samples, then by appropriate
Helium injects in above-mentioned target detection sample, records in the hole of above-mentioned target detection sample not by above-mentioned former
The pore volume that beginning fluid liquid is filled, by above-mentioned original fluid liquid volume and above-mentioned not by original liquid
The pore volume of fluid filled is added the total pore volume obtaining target detection sample, by above-mentioned original liquid
Fluid volume compares the original fluid liquid saturation obtaining target detection sample with above-mentioned total pore volume.
After above-mentioned nuclear magnetic resonance, NMR and helium injection process terminate, use toluene solvant to same target detection sample
Carry out distillation extracting, by toluene solvant by the water in above-mentioned target detection sample and the oil (oil in sample
It is due to when carrying out oil-base coreing, during partly oil has invaded core sample) extract, by
Occupying large hole larynx space in hole in the oil invaded, utilization distillation extracting can be accurately by above-mentioned target
Out, but water occupies pore throat space less in hole in oil extraction in test sample, and above-mentioned target
There is more fine pore in test sample, present in this fine pore, more irreducible water cannot be by steaming
Evaporating method for extracting to be extracted completely, therefore, the water yield now extracted is relative to the measurement essence of oil mass
Degree is relatively coarse, and the water volume of this process i.e. cannot be utilized accurately to calculate above-mentioned target detection sample
Water saturation.But can be compared with above-mentioned total pore volume by the oil volume measured and obtain above-mentioned target
The oil saturation of test sample, deducts above-mentioned oil saturation by above-mentioned original fluid liquid saturation
Obtaining water saturation, i.e. obtain the original water saturation of above-mentioned target detection sample, each sample measures
Original water saturation value be mainly distributed between 40%-63%.Owing to above-mentioned target detection sample can
Represent the original fluid liquid state of A gas field reservoir core, thus the above-mentioned original water saturation recorded
It it is exactly the original water saturation of A gas field reservoir core.
Original fluid liquid volume and not by liquid in the hole of the target detection sample recorded at above-described embodiment
During the fluid-filled pore volume of state, also record the outer surface cumulative volume of above-mentioned target detection sample, pass through
Above-mentioned total pore volume than above-mentioned outer surface cumulative volume obtain above-mentioned target detection sample total porosity divide
Cloth measures above-mentioned target detection sample in 3.7%-7.1%, recycling helium injection method or other existing methods
Total porosity be distributed in 3.9%-7.2%, the above-mentioned target detection sample that above two method is recorded
Total porosity compare, the relative difference of the total porosity finding to use two kinds of methods to measure all less than
3%, illustrate that the target detection sample using the method choice of the present embodiment is suitable, use side of the present invention
The total porosity of the target detection sample that method records also is accurately.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than right
It limits；Although the present invention being described in detail with reference to foregoing embodiments, this area common
Skilled artisans appreciate that the technical scheme described in foregoing embodiments still can be modified by it,
Or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, and
The essence not making appropriate technical solution departs from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the determination method of the original water saturation of Sandstone Gas Reservoir, it is characterised in that including:
Obtain sampling size and target echo interval；
Sample according to described sampling size, obtain target detection sample；
By described target echo interval, described target detection sample is carried out nuclear magnetic resonance, NMR process, to obtain
The original fluid liquid saturation of described target detection sample；
Described target detection sample is carried out distillation extracting, contains obtaining described the original of target detection sample
Oil saturation；
According to described original fluid liquid saturation and described initial oil saturation, obtain described target and survey
The original water saturation of test agent.
Method the most according to claim 1, it is characterised in that described acquisition sampling size, including:
Obtaining full diameter sample and N number of standard plunger piston sample, wherein, described N >=2, described N is integer；
Obtain described full diameter sample and the original water saturation of each described standard plunger piston sample and reality respectively
Gaging hole porosity；
Target criteria plunger sample, wherein, described target mark is determined in described N number of standard plunger piston sample
Quasi-plunger sample is original water saturation and described full diameter sample in described N number of standard plunger piston sample
The sample that the difference of original water saturation is minimum；
Determine a length of described sampling size of described target criteria plunger sample.
Method the most according to claim 2, it is characterised in that the full diameter sample of described acquisition and N
Individual standard plunger piston sample, specifically includes:
Under liquid nitrogen environment, obtain described full diameter sample and described N number of standard plunger piston sample.
Method the most according to claim 2, it is characterised in that the full diameter sample of described acquisition and N
Individual standard plunger piston sample, including:
From Sandstone Gas Reservoir, core sample, wherein, described oil base mud is drilled through under the conditions of oil-base mud
In slurry, the mass ratio of oil and water is more than or equal to 80:20；
Utilize diesel oil that described core sample is carried out, is dried；
Core sample after drying carries out 6 layers of parcel the most successively, and described 6 layers of parcel include:
Ground floor parcel preservative film, second layer parcel mulberry paper, third layer parcel preservative film, the 4th layer of parcel Mulberry
Mulberry paper, layer 5 parcel masking foil, layer 6 parcel kraft paper；
Core sample after parcel is carried out encapsulation process；
To described carry out encapsulation process after core sample cut, with obtain described full diameter sample and
Described N number of standard plunger piston sample.
Method the most according to claim 2, it is characterised in that described obtain described full diameter respectively
Sample and the original water saturation of each described standard plunger piston sample, including:
In preset duration, described full diameter sample and each described standard plunger piston sample are carried out distillation extracting,
To obtain described full diameter sample and the aqueous volume of each described standard plunger piston sample respectively；
Full diameter sample after described distillation extracting and each standard plunger piston sample are filled helium process, to divide
Do not obtain described full diameter sample and the total pore volume of each described standard plunger piston sample；
Aqueous volume and the total pore volume of described full diameter sample according to described full diameter sample obtain institute
State the original water saturation of full diameter sample；
Aqueous volume and the hole of each described standard plunger piston sample according to each described standard plunger piston sample are overall
The long-pending original water saturation obtaining each described standard plunger piston sample.
Method the most according to claim 5, it is characterised in that described obtain described full diameter respectively
Sample and the actual measurement porosity of each described standard plunger piston sample, including:
Obtain described full diameter sample and the apparent volume of each described standard plunger piston sample；
Total pore volume according to described full diameter sample and the apparent volume of described full diameter sample, obtain
The actual measurement porosity of described full diameter sample；
Total pore volume according to each described standard plunger piston sample and the appearance body of each described standard plunger piston sample
Long-pending, obtain the actual measurement porosity of each described standard plunger piston sample.
Method the most according to claim 2, it is characterised in that described acquisition target echo is spaced,
Including:
Determining M echo sounding to be selected, wherein, described M >=2, described M is integer；
It is utilized respectively each described echo sounding to be selected described target criteria plunger sample is carried out at nuclear magnetic resonance, NMR
Reason, to obtain described target criteria plunger sample M porosity under each described echo sounding to be selected；
In described M echo sounding to be selected, determine that target echo is spaced, wherein, described target criteria post
Fill in the actual measurement hole of sample porosity under described target echo is spaced and described target criteria plunger sample
The difference of degree, less than any one in addition to being spaced except described target echo of described target criteria plunger sample
The difference of the actual measurement porosity of the porosity under echo sounding to be selected and described target criteria plunger sample.
Method the most according to claim 7, it is characterised in that described determine M echo to be selected
Before interval, also include:
Described target criteria plunger sample is carried out saturated formation water process.
9. according to the method described in any one of claim 1 to 8, it is characterised in that described by described
Target echo interval carries out nuclear magnetic resonance, NMR process to described target detection sample, to obtain described target detection
The original fluid liquid saturation of sample, including:
By described target echo interval, described target detection sample is carried out nuclear magnetic resonance, NMR process, obtain institute
State target detection sample hole in original fluid liquid volume；
In described target detection sample, inject helium, obtain in the hole of described target detection sample not by
The pore volume that described original fluid liquid is filled；
According to described original fluid liquid volume and the described pore-body do not filled by described original fluid liquid
Long-pending, obtain the total pore volume of described target detection sample；
According to described original fluid liquid volume and described total pore volume, obtain described target detection sample
Original fluid liquid saturation.
Method the most according to claim 9, it is characterised in that described to described target detection sample
Product carry out distillation extracting, to obtain the initial oil saturation of described target detection sample, including:
Described target detection sample is carried out distillation extracting, obtains in the hole of described target detection sample
Oil volume；
According to described oil volume and the total pore volume of described target detection sample, determine described target detection
The initial oil saturation of sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192192.XA CN105891250B (en) | 2016-03-30 | 2016-03-30 | Method for determining original water saturation of tight sandstone reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192192.XA CN105891250B (en) | 2016-03-30 | 2016-03-30 | Method for determining original water saturation of tight sandstone reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105891250A true CN105891250A (en) | 2016-08-24 |
| CN105891250B CN105891250B (en) | 2017-12-19 |
Family
ID=57014918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610192192.XA Active CN105891250B (en) | 2016-03-30 | 2016-03-30 | Method for determining original water saturation of tight sandstone reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105891250B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442044A (en) * | 2016-08-29 | 2017-02-22 | 中国石油天然气股份有限公司 | Method for manufacturing unconventional tight sandstone oil quantitative simulation experiment sample |
| CN106706686A (en) * | 2016-12-06 | 2017-05-24 | 东北大学 | Method for determining water saturation degree and hydration damage relation of organic matter-enriched shale |
| CN107655922A (en) * | 2017-09-05 | 2018-02-02 | 中国石油天然气股份有限公司 | Nuclear magnetic resonance-based nondestructive testing method for water content of hydrocarbon source rock |
| CN111007096A (en) * | 2019-11-29 | 2020-04-14 | 同济大学 | Method for measuring water content of sand |
| CN111852465A (en) * | 2020-08-27 | 2020-10-30 | 中国石油大学(华东) | Method for evaluating original water content of shale reservoir core obtained by water-based mud drilling |
| CN111983182A (en) * | 2019-05-23 | 2020-11-24 | 中国石油化工股份有限公司 | Method for testing original water saturation of shale gas reservoir |
| CN114112841A (en) * | 2021-11-19 | 2022-03-01 | 中国石油大学(华东) | Calculation method for saturation of bound water of tight sandstone reservoir |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769602A (en) * | 1986-07-02 | 1988-09-06 | Shell Oil Company | Determining multiphase saturations by NMR imaging of multiple nuclides |
| US20030107374A1 (en) * | 2001-11-06 | 2003-06-12 | Baker Hughes Incorporated | Objective oriented methods for NMR log acquisitions for estimating earth formation and fluid properties |
| CN1763563A (en) * | 2004-10-21 | 2006-04-26 | 北京大学 | Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal |
| CA2782731A1 (en) * | 2009-12-16 | 2011-06-23 | Bp Exploration Operating Company Limited | Method for measuring rock wettability |
| CN104215652A (en) * | 2014-08-21 | 2014-12-17 | 中国石油天然气股份有限公司 | Method and device for determining oil and gas saturation |
| CN104777181A (en) * | 2014-12-31 | 2015-07-15 | 中国石油天然气股份有限公司 | Nuclear magnetic resonance T of dense oil2Cutoff value and fluid saturation determination method and device |
-
2016
- 2016-03-30 CN CN201610192192.XA patent/CN105891250B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769602A (en) * | 1986-07-02 | 1988-09-06 | Shell Oil Company | Determining multiphase saturations by NMR imaging of multiple nuclides |
| US20030107374A1 (en) * | 2001-11-06 | 2003-06-12 | Baker Hughes Incorporated | Objective oriented methods for NMR log acquisitions for estimating earth formation and fluid properties |
| CN1763563A (en) * | 2004-10-21 | 2006-04-26 | 北京大学 | Apparatus and method for measuring stratum rock physical property by rock NMR relaxation signal |
| CA2782731A1 (en) * | 2009-12-16 | 2011-06-23 | Bp Exploration Operating Company Limited | Method for measuring rock wettability |
| CN104215652A (en) * | 2014-08-21 | 2014-12-17 | 中国石油天然气股份有限公司 | Method and device for determining oil and gas saturation |
| CN104777181A (en) * | 2014-12-31 | 2015-07-15 | 中国石油天然气股份有限公司 | Nuclear magnetic resonance T of dense oil2Cutoff value and fluid saturation determination method and device |
Non-Patent Citations (2)
| Title |
|---|
| J.J. HOWARD: "WETTABILITY AND FLUID SATURATIONS DETERMINED FROM NMR Tl DISTRIBUTIONS", 《MAGNETIC RESONANCE IMAGING》 * |
| 郎东江 等: "致密砂岩储层流体参数核磁共振实验研究", 《CT 理论与应用研究》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442044A (en) * | 2016-08-29 | 2017-02-22 | 中国石油天然气股份有限公司 | Method for manufacturing unconventional tight sandstone oil quantitative simulation experiment sample |
| CN106442044B (en) * | 2016-08-29 | 2019-03-05 | 中国石油天然气股份有限公司 | Method for manufacturing unconventional tight sandstone oil quantitative simulation experiment sample |
| CN106706686A (en) * | 2016-12-06 | 2017-05-24 | 东北大学 | Method for determining water saturation degree and hydration damage relation of organic matter-enriched shale |
| CN107655922A (en) * | 2017-09-05 | 2018-02-02 | 中国石油天然气股份有限公司 | Nuclear magnetic resonance-based nondestructive testing method for water content of hydrocarbon source rock |
| CN111983182A (en) * | 2019-05-23 | 2020-11-24 | 中国石油化工股份有限公司 | Method for testing original water saturation of shale gas reservoir |
| CN111007096A (en) * | 2019-11-29 | 2020-04-14 | 同济大学 | Method for measuring water content of sand |
| CN111852465A (en) * | 2020-08-27 | 2020-10-30 | 中国石油大学(华东) | Method for evaluating original water content of shale reservoir core obtained by water-based mud drilling |
| CN114112841A (en) * | 2021-11-19 | 2022-03-01 | 中国石油大学(华东) | Calculation method for saturation of bound water of tight sandstone reservoir |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105891250B (en) | 2017-12-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105891250B (en) | Method for determining original water saturation of tight sandstone reservoir | |
| Hardie et al. | Determining the frequency, depth and velocity of preferential flow by high frequency soil moisture monitoring | |
| CN1272640C (en) | Determination of oil reservoir wettability using nuclear magnetic resonance testing of shaft | |
| CN106501144A (en) | A kind of tight sand calculation of permeability based on the double cutoffs of nuclear magnetic resonance | |
| CN106153662A (en) | The measuring method of rock core stress sensitivity | |
| CN104697915A (en) | Shale micropore size and fluid distribution analysis method | |
| EA023601B1 (en) | Method for measuring rock wettability | |
| US9176251B2 (en) | Asphaltene evaluation based on NMR measurements and temperature / pressure cycling | |
| Xin et al. | Pore structure evaluation in ultra-deep tight sandstones using NMR measurements and fractal analysis | |
| CN104075959A (en) | Accurate shale oil-water saturation testing method | |
| CN108827999A (en) | The evaluation method of low porosity permeability sandstone reservoir moveable oil ratio and moveable oil stock number | |
| CN106323835B (en) | Method for determining cementing index of heterogeneous carbonate reservoir | |
| Wang et al. | Microscope dynamic characterization of oil charging in tight sandstone using a physical simulation experiment | |
| CN106290103A (en) | The assay method of clay micropore degree in a kind of shale gas reservoir | |
| Nelson | An approach to evaluating fractured reservoirs | |
| CN110231268B (en) | Method for analyzing oil-water occurrence pore size distribution of rock of tight reservoir | |
| Woodhouse | Accurate reservoir water saturations from oil-mud cores: Questions and answers from Prudhoe Bay and beyond | |
| CN107218969A (en) | A kind of phase time for determining oil-gas migration, time, the method in power and direction | |
| Al Sayari | The influence of wettability and carbon dioxide injection on hydrocarbon recovery | |
| CN107941840B (en) | A kind of formation water salinity test method based on nuclear magnetic resonance technique | |
| Fleury et al. | Petrophysical measurements for CO2 storage: Application to the Ketzin site | |
| RU2780988C1 (en) | Method for determining the total porosity of naturally saturated rock samples using the nmr method | |
| Simonsen et al. | Permeability of a stiff fissured very high plasticity palaeogene clay-direct and indirect measurement methods and scale effects | |
| SU934422A1 (en) | Method of evaluating degree of mud injection into drilled rocks | |
| Lawrence et al. | Macro and micro fabrics in chalk identified using the Bushinsky Oil Technique: an updated method and new applications for an old experimental technique |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |