CN105547959A - Analysis method of natural gas storage and collection capability of matrix pores in dense bedrock - Google Patents
Analysis method of natural gas storage and collection capability of matrix pores in dense bedrock Download PDFInfo
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- CN105547959A CN105547959A CN201511019829.7A CN201511019829A CN105547959A CN 105547959 A CN105547959 A CN 105547959A CN 201511019829 A CN201511019829 A CN 201511019829A CN 105547959 A CN105547959 A CN 105547959A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The invention provides an analysis method of natural gas storage and collection capability of matrix pores in a dense bedrock. The analysis method comprises the following steps: measuring the gas porosity of a rock sample to be detected by using a helium method; calculating a total pore volume of the rock sample to be detected according to the volume and gas porosity of the rock sample to be detected; injecting a non-wet-phase liquid into the rock sample to be detected and gradually increasing injection pressure until the saturation degree of the non-wet-phase liquid is not increased along with the increasing of a pressure value, wherein the saturation degree is calculated by the total pore volume; carrying out data setting point drawing according to the pressure value and the corresponding saturation degree of the non-wet-phase liquid to obtain a capillary pressure curve of the rock sample to be detected; and reading a maximum value of the saturation degree of the non-wet-phase liquid on the capillary pressure curve and obtaining the percent of the volume of the matrix pores in the total pore volume of the rock sample to be detected according to the maximum value. With the adoption of the analysis method provided by the invention, the volume percent of the matrix pores in the whole block-shaped rock sample can be accurately calculated, so that the natural gas storage and collection capability of matrix pores is determined.
Description
Technical field
The present invention relates to the evaluating reservoir field in Natural Gas Geology exploration engineering, especially a kind of fine and close basement rock mesostroma hole preserves the analytical approach of rock gas ability.
Background technology
Reservoir assessment technology is one of most important technology in petroleum geology exploration field, in hydrocarbon zone, the ability of preserving of rock directly determines scale and the production capacity of hydrocarbon-bearing pool, wherein evaluation of physical property and pore configuration research are one of the important content in Oil/Gas Reservoir Assessment (National Energy Boards, SY/T6285-2011 Oil/Gas Reservoir Assessment method, p.1-15,2011; Sieve is stung the pore texture of pool and Wang Yuncheng, reservoir of oil and gas, Beijing, Science Press, 1986).
In recent years, explorationists have found huge natural gas pool in the fine and close basement rock in Caidamu Basin Dong Ping area, scholars are found by the basement rock gas reservoir of the land maximum-norm of this China of research, matrix pores (the Ma Feng etc. that a large amount of aperture is minimum are grown in its reservoir, Caidamu Basin Dong Ping area basement rock gas reservoir evaluation, Petroleum finance, v42, n3, p.266-273, 2015), the unapproachable matrix pores of these petroleum liquids is the good reservoir space of rock gas, this important achievement change over it is conventionally believed that " basement rock reservoir space based on fracture and derive from crack " viewpoint (YANXiang-binetal., OrdovicianBasementHydrocarbonReservoirsintheTarimBasin, China, ActaGeologicaSinca, v78, n3, p.676-683, 2004, AnirbidSircar, Hydrocarbonproductionfromfracturedbasementformations, Currentscience, v87, n2, p.147-151,2004) important factor for controlling of eastern level ground gas reservoir energy Sustainable high yield, stable yields, has also well been annotated.
The method that sand smellers adopt usually when measuring the factor of porosity of rock comprises: Archimedes's mercury immersion method, mercury displacement process, vernier caliper measurement method, Boyle's law two rooms method, (the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China such as fluid saturation method, Standardization Administration of China, GB/T29172-2012 core analysis method, p.78-102, 2012), the porosity data that these methods or combination or independent measurement go out has the implication of total pore size volume, but different aperture type cannot be distinguished (as matrix pores, dissolution porosity, crack etc.) respective shared number percent, especially the determination of matrix pores volume is particularly important, can its percentage composition directly determines rock gas continuously steady production or production declines rate.For the fine and close identification of basement rock mesostroma hole and the measurement of pore size, sand smellers adopt field emission scanning electron microscope method (China State Bureau of Quality and Technical Supervision usually, GB/T18295-2001 oil and gas reservoir sample of sandstone scanning electron microscope analysis method, p.1-8,2001) realize, it is very clear on instrument system scale after the pore size of single matrix pores is amplified by scanning electron microscope, but scanning electron microscope method cannot calculate these matrix pores percent by volume shared in whole rock sample block, and namely the ability of preserving of matrix pores is difficult to quantitative analysis.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the analytical approach that a kind of fine and close basement rock mesostroma hole preserves rock gas ability, described analytical approach comprises:
Helium method is utilized to measure the gaseous porosity of rock sample to be measured;
According to the volume of described rock sample to be measured and the total pore size volume of the described rock sample to be measured of described gaseous porosity calculating:
Inject non-wetted phase liquid to described rock sample to be measured, and increase injection pressure gradually, until the saturation degree of non-wetted phase liquid does not increase with the increase of force value, wherein, described saturation degree is calculated by described total pore size volume;
Saturation degree according to the non-wetted phase liquid of described force value and correspondence thereof carries out the mapping of data cultellation, obtains the capillary pressure curve of described rock sample to be measured;
Read the maximal value of the non-wetted phase liquid saturation on described capillary pressure curve, the volume obtaining matrix pores according to described maximal value accounts for the number percent of the total pore size volume of described rock sample to be measured;
Wherein, V
pfor the total pore size volume of rock sample to be measured; V
bfor the volume of rock sample to be measured;
for the gaseous porosity of rock sample to be measured.
In one embodiment, utilize helium method to measure the gaseous porosity of rock sample to be measured, comprising:
Described rock sample to be measured is put into sample chamber, and helium is inputted reference cell, make the pressure in reference cell reach preset pressure P
1, be communicated with described reference cell and sample chamber, after the pressure equilibrium of reference cell and sample chamber, measure the pressure P in reference cell
2;
According to volume, the volume of sample chamber, the preset pressure P of described reference cell
1and pressure P
2calculate the volume of particle in rock sample to be measured;
Gaseous porosity according to the volume of particle in described rock sample to be measured and the volume computing rock sample to be measured of rock sample to be measured:
Wherein,
for the gaseous porosity of rock sample to be measured; V
gfor the volume of particle in rock sample to be measured.
In one embodiment, according to volume, the volume of sample chamber, the preset pressure P of described reference cell
1, pressure P
2calculate the volume of particle in rock sample to be measured, comprising:
By the volume of described reference cell, preset pressure P
1and pressure P
2substitute into Boyle formula, calculate intermediate volume variable;
According to the volume of described sample chamber, the volume of reference cell and described intermediate volume variable, calculate the volume of particle in rock sample to be measured.
In one embodiment, described predetermined pressure P
1span be [690kPa, 1380kPa].
In one embodiment, the volume obtaining matrix pores according to described maximal value accounts for the number percent of the total pore size volume of described rock sample to be measured, comprise: poor with described maximal value with 100%, the volume obtaining matrix pores accounts for the number percent of the total pore size volume of described rock sample to be measured.
In one embodiment, described analytical approach also comprises:
Obtain the physical dimension of rock sample to be measured, and calculate the volume of described rock sample to be measured according to described physical dimension.
In one embodiment, before the physical dimension obtaining rock sample to be measured, described analytical approach also comprises: cleaned up by rock sample to be measured and dry to constant weight.
In one embodiment, described non-wetted phase liquid is mercury.
Only can measure the pore size of matrix pores for scanning electron microscope method and the difficult problem of the percent by volume of matrix pores cannot be calculated, the present invention adopts helium method and mercury intrusion method to combine can to accurately calculate the percent by volume shared by whole block rock sample mesostroma hole, thus determines that matrix pores preserves the ability of rock gas.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet that the embodiment of the present invention fine and close basement rock mesostroma hole preserves the analytical approach of rock gas ability;
Fig. 2 is that the embodiment of the present invention utilizes helium method to measure the schematic flow sheet of the gaseous porosity of rock sample to be measured;
Fig. 3 is the capillary pressure curve of embodiment of the present invention Caidamu Basin Dong Ping 105 well four basement rock samples.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the schematic flow sheet that the embodiment of the present invention fine and close basement rock mesostroma hole preserves the analytical approach of rock gas ability.As shown in Figure 1, this analytical approach mainly comprises the following steps:
Step S1, helium method is utilized to measure the gaseous porosity of rock sample to be measured.
Fine and close basement rock taken from by rock sample to be measured, it comprises larger other hole of the minimum matrix pores in aperture and aperture, wherein, the minimum matrix pores in above-mentioned aperture is mainly used in preserving rock gas, want to know that rock sample to be measured preserves the ability of rock gas, the volume of the volume or matrix pores that need obtain matrix pores accounts for the number percent of rock sample total pore size volume to be measured.
Total pore size volume due to rock sample to be measured comprises the volume of voids of matrix pores, also the volume of other larger type hole is comprised, due to the little and stable chemical nature of helium atom radius, the minimum matrix pores in aperture can be entered under a certain pressure, therefore adopt helium method to measure the gaseous porosity of cylindric rock sample.When measuring, for obtaining higher degree of accuracy, can average based on duplicate measurements.
Step S2, the gaseous porosity obtained according to volume and the step S1 of rock sample to be measured calculate the total pore size volume of rock sample to be measured:
In formula (1), V
pfor the total pore size volume of rock sample to be measured; V
bfor the volume of rock sample to be measured;
for the gaseous porosity of rock sample to be measured.
Step S3, inject non-wetted phase liquid to rock sample to be measured, and increase injection pressure gradually, until the saturation degree of non-wetted phase liquid does not increase with the increase of force value, wherein, above-mentioned saturation degree is calculated by described total pore size volume.
In the present invention, only with non-wetted phase liquid for mercury is described, but not as limit.
In rock sample to be measured, inject mercury, and increase injection pressure gradually, record pressure is by P
irise to P
i+1time enter mercury quantity B
iand B
i+1, and according to formula (2), the total pore size volume in conjunction with rock sample to be measured calculates corresponding mercury saturation increment Delta S
hg, until mercury saturation does not increase with the increase of pressure.
ΔS
Hg＝[(B
i+1-B
i)－(K
i+1-K
i)×α]/V
p×100％(2)
S
Hg＝∑ΔS
Hg(3)
Wherein, Δ S
hgfor mercury saturation increment; B
iand B
i+1be respectively as pressure is by P
irise to P
i+1time enter mercury quantity, mL; K
iand K
i+1be pressure be respectively P
iand P
i+1time the measured value of blank assay volume, mL; α is the volume constant of instrument, the volume change namely representated by mercury injection apparatus unit measure; S
hgfor accumulative mercury saturation.
Step S4, carry out the mapping of data cultellation according to the non-wetted phase liquid saturation of described force value and correspondence thereof, obtain the capillary pressure curve of described rock sample to be measured.
During concrete enforcement, the mapping of data cultellation is carried out according to each force value above-mentioned and accumulative mercury saturation corresponding to this force value, with accumulative mercury saturation for horizontal ordinate (being by 0 to 100% from right to left), with the logarithm of force value for ordinate, semilog plot is drawn out the relation curve of capillary pressure and mercury saturation, i.e. capillary pressure curve.Owing to injecting mercury until mercury saturation does not increase with the increase of force value in step S3 in rock sample to be measured, therefore, the capillary pressure curve obtained in step S4 can be vertical propradation.
The maximal value of step S5, the non-wetted phase liquid saturation read on described capillary pressure curve, the volume obtaining matrix pores according to described maximal value accounts for the number percent of the total pore size volume of described rock sample to be measured.
The present invention adopts helium method and mercury intrusion method to combine can to accurately calculate the percent by volume shared by whole block rock sample mesostroma hole, thus determines that matrix pores preserves the ability of rock gas.
In step sl, when utilizing helium method to measure the gaseous porosity of rock sample to be measured, the physical dimension of rock sample to be measured need be obtained in advance, and calculate the volume of rock sample to be measured according to its physical dimension.During concrete enforcement, usually getting and drilling through diameter is 2.50cm, it is highly the cylindric rock sample of 3.00 ~ 8.00cm, weigh with physical balance and obtain the quality W (unit: g) of rock sample, its physical dimension is accurately measured with vernier caliper, average based on more than 5 times duplicate measurementss, calculate the volume V of rock sample
b(unit: mL).
Usually, before the physical dimension obtaining rock sample to be measured, in order to obtain the size of rock sample to be measured more accurately, rock sample to be measured need be dried to constant weight, then measure the physical parameter such as size of rock sample to be measured.
Measuring after obtaining the physical parameters such as the size of rock sample to be measured, when utilizing step S1 to measure the gaseous porosity of rock sample to be measured, can carry out according to step shown in Fig. 2:
S11, rock sample to be measured is put into sample chamber (now the pressure of sample chamber equals atmospheric pressure), and correspondence arranges a reference cell, and in reference cell, pass into helium, until the pressure in reference cell reaches the pressure value P preset
1.Then, be communicated with reference cell and sample chamber, the helium now in reference cell expands and enters sample chamber, waits for a period of time, and measures the pressure P in reference cell after the pressure equilibrium of reference cell and sample chamber
2.
Step S12, the volume according to reference cell, the volume of sample chamber, preset pressure P
1and pressure P
2calculate the volume V of particle in rock sample to be measured
g.
Step S13, volume V according to particle in rock sample to be measured
gand the volume V of rock sample to be measured
bcalculate the gaseous porosity of rock sample to be measured:
In formula,
for the gaseous porosity of rock sample to be measured; V
gfor the volume of particle in rock sample to be measured.
In step s 12, can first by the volume of described reference cell, preset pressure P
1and pressure P
2substitute into Boyle formula, calculate an intermediate volume variable V
2:
P
1V
1＝P
2V
2(5)
In formula, V
1for reference cell volume; P
1for preset pressure; I.e. reference cell original pressure; P
2for reference cell be communicated with sample chamber after pressure, after reference cell is communicated with sample chamber, the pressure in the matrix pores of sample chamber, reference cell and rock sample to be measured is equal, all equals P
2; V
2for intermediate volume variable, V
2=V
1+ V
c-V
g, i.e. V
2for reference cell volume adds the volume that sample chamber volume deducts particle in rock sample to be measured, V
cfor sample chamber volume.
The volume of room, the volume of reference cell and above-mentioned intermediate volume variable, calculate the volume V of particle in rock sample to be measured per sample
g, i.e. V
g=V
1+ V
c-V
2.
Under normal circumstances, the predetermined pressure P reached when passing into helium in reference cell
1general in [690kPa, 1380kPa] interior value.
The capillary pressure curve that step S4 obtains can directly read the maximal value of mercury saturation, and poor with this maximal value with 100%, the volume that can obtain matrix pores accounts for the number percent of the total pore size volume of rock sample to be measured.
The present invention adopts helium method and mercury intrusion method to combine can to accurately calculate the percent by volume shared by whole block rock sample mesostroma hole, thus determines that matrix pores preserves the ability of rock gas.
Preserving analytical approach and the beneficial effect thereof of rock gas ability in order to understand fine and close basement rock mesostroma hole of the present invention better, being described below in conjunction with concrete example.
For Caidamu Basin Dong Ping 105 well, in this well, drill through diameter is 2.54cm, is highly that the cylindric rock sample of 3.00 ~ 8.00cm amounts to four samples, is cleaned up by these rock samples and dries to horizontal heavy, accurately measuring its physical dimension with vernier caliper.Then, utilize helium method accurately to measure No. 1 sample, the total porosity of No. 2 samples, No. 3 samples and No. 4 samples is respectively 4.3%, 2%, 2.7% and 4.8%, recycling step S2 ~ S4 obtains the capillary pressure curve of each rock sample respectively, as shown in Figure 3.Can read from Fig. 3 each sample maximum enter mercury saturation be respectively 61.7%, 59.3%, 54.1% and 50.7%, calculate the number percent that the matrix pores in each sample accounts for total pore size volume at rock sample thus and be respectively 38.3%, 40.7%, 45.9% and 49.3%.
Only can measure the pore size of matrix pores for scanning electron microscope method and the difficult problem of the percent by volume of matrix pores cannot be calculated, the inventive method adopts helium method and mercury intrusion method to combine the percent by volume that can accurately calculate shared by whole block rock sample mesostroma hole, thus determines that matrix pores preserves the ability of rock gas.This achievement in research shows matrix pores and play key player in the Gas Fields reservoir space type of eastern level ground, predicts eastern level ground Gas Fields energy continuously steady production thus, plays directive function to formulation development plan.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. fine and close basement rock mesostroma hole preserves an analytical approach for rock gas ability, and it is characterized in that, described analytical approach comprises:
Helium method is utilized to measure the gaseous porosity of rock sample to be measured;
According to the volume of described rock sample to be measured and the total pore size volume of the described rock sample to be measured of described gaseous porosity calculating:
Inject non-wetted phase liquid to described rock sample to be measured, and increase injection pressure gradually, until the saturation degree of non-wetted phase liquid does not increase with the increase of force value, wherein, described saturation degree is calculated by described total pore size volume;
Saturation degree according to the non-wetted phase liquid of described force value and correspondence thereof carries out the mapping of data cultellation, obtains the capillary pressure curve of described rock sample to be measured;
Read the maximal value of the non-wetted phase liquid saturation on described capillary pressure curve, the volume obtaining matrix pores according to described maximal value accounts for the number percent of the total pore size volume of described rock sample to be measured;
Wherein, V
pfor the total pore size volume of rock sample to be measured; V
bfor the volume of rock sample to be measured;
for the gaseous porosity of rock sample to be measured.
2. fine and close basement rock mesostroma hole according to claim 1 preserves the analytical approach of rock gas ability, it is characterized in that, utilizes helium method to measure the gaseous porosity of rock sample to be measured, comprising:
Described rock sample to be measured is put into sample chamber, and helium is inputted reference cell, make the pressure in reference cell reach preset pressure P
1, be communicated with described reference cell and sample chamber, after the pressure equilibrium of reference cell and sample chamber, measure the pressure P in reference cell
2;
According to volume, the volume of sample chamber, the preset pressure P of described reference cell
1and pressure P
2calculate the volume of particle in rock sample to be measured;
Gaseous porosity according to the volume of particle in described rock sample to be measured and the volume computing rock sample to be measured of rock sample to be measured:
Wherein,
for the gaseous porosity of rock sample to be measured; V
gfor the volume of particle in rock sample to be measured.
3. fine and close basement rock mesostroma hole according to claim 2 preserves the analytical approach of rock gas ability, it is characterized in that, according to volume, the volume of sample chamber, the preset pressure P of described reference cell
1, pressure P
2calculate the volume of particle in rock sample to be measured, comprising:
By the volume of described reference cell, preset pressure P
1and pressure P
2substitute into Boyle formula, calculate intermediate volume variable;
According to the volume of described sample chamber, the volume of reference cell and described intermediate volume variable, calculate the volume of particle in rock sample to be measured.
4. fine and close basement rock mesostroma hole according to claim 2 preserves the analytical approach of rock gas ability, it is characterized in that, described predetermined pressure P
1span be [690kPa, 1380kPa].
5. fine and close basement rock mesostroma hole according to claim 1 preserves the analytical approach of rock gas ability, it is characterized in that, the volume obtaining matrix pores according to described maximal value accounts for the number percent of the total pore size volume of described rock sample to be measured, comprise: poor with described maximal value with 100%, the volume obtaining matrix pores accounts for the number percent of the total pore size volume of described rock sample to be measured.
6. fine and close basement rock mesostroma hole according to claim 1 preserves the analytical approach of rock gas ability, and it is characterized in that, described analytical approach also comprises:
Obtain the physical dimension of rock sample to be measured, and calculate the volume of described rock sample to be measured according to described physical dimension.
7. fine and close basement rock mesostroma hole according to claim 6 preserves the analytical approach of rock gas ability, it is characterized in that, before the physical dimension obtaining rock sample to be measured, described analytical approach also comprises: cleaned up by rock sample to be measured and dry to constant weight.
8. the fine and close basement rock mesostroma hole according to any one of claim 1-7 preserves the analytical approach of rock gas ability, it is characterized in that, described non-wetted phase liquid is mercury.
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| CN106908371A (en) * | 2017-04-05 | 2017-06-30 | 中国石油化工股份有限公司石油勘探开发研究院 | A kind of shale storage and collection performance measurement apparatus and method |
| CN108896462A (en) * | 2018-05-16 | 2018-11-27 | 中国石油天然气股份有限公司 | A kind of conglomerate porosity determination method |
| CN108956422A (en) * | 2018-07-18 | 2018-12-07 | 中国石油大学(华东) | A kind of porosity experimental measurement method of compact reservoir |
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| CN105547959B (en) | 2019-01-18 |
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