CN107843531A - The nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis - Google Patents
The nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 72
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003921 oil Substances 0.000 claims abstract description 91
- 239000011435 rock Substances 0.000 claims abstract description 53
- 238000009826 distribution Methods 0.000 claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 238000011160 research Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000002474 experimental method Methods 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 238000000844 transformation Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 8
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 7
- 229910052753 mercury Inorganic materials 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 241001269238 Data Species 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000000205 computational method Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 5
- 230000005311 nuclear magnetism Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- 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
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Abstract
The present invention provides a kind of nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis, including：Analyzed by nuclear magnetic resonance experiment under the different low viscous oils of true core saturation, obtain the rock core NMR relaxation time T of saturation different viscosities oil2Distribution；By the pore Structure Analysis of true core, the pore throat radius r distributions of rock core are obtained；Establish relaxation time T2The benchmark model converted between value and pore throat radius r；Establish conversion factorMWith rock core T under fluid viscosity and the fluid2Relation between geometrical mean, determines conversion factorM；Benchmark model is combined with conversion factor to obtain General transformations model, and then obtains the plan capillary pressure curve and pore structure distribution and characteristic parameter of reservoir.This method can obtain continuous, quantitative RESERVOIR PORE STRUCTURE parameter from Nuclear Magnetic Resonance Logging, to carry out evaluating reservoir research, for LOW PERMEABILITY RESERVOIR reasonable, effective exploitation provide more comprehensively, more accurately reservoir data.
Description
Technical field
The present invention relates to oil field development technical field, especially relates to a kind of low viscous oil oil reservoir pore structure of hyposmosis
Nuclear magnetic resonance parameter characterizing method.
Background technology
Advanced technology of the nuclear magnetic resonance technique as core analysis, using response of the atomic nucleus in magnetic field, pass through saturation
Or absorption realizes the description and evaluation to media interior structure and microscopic pattern in the characteristic nmr of medium Fluid in Pore,
With multiple superiority such as lossless, nontoxic, harmless, quick, a variety of detectable objects.
The subject matter that LOW PERMEABILITY RESERVOIR exploitation faces is how to utilize oil in NMR logging data progress reservoir
The pore configuration research of layer segment, because the oil, water NMR response between blowhole are different, and existing utilization nuclear-magnetism is surveyed
The method of well source investigation RESERVOIR PORE STRUCTURE is only suitable for water layer, can not be applied in the Nuclear Magnetic Resonance Logging of oil layer section.It is low
It is fine to ooze reservoir pore throat, the contained most viscosity of crude oil is relatively low in hole, and we have invented one kind for this to be directed to the low viscous oil of hyposmosis
The nuclear magnetic resonance parameter characterizing method of oil reservoir pore structure, solves above technical problem.
The content of the invention
It is an object of the invention to provide a kind of oil reservoir part pore structure in reservoir is carried out using NMR logging data
The nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis of research.
The purpose of the present invention can be achieved by the following technical measures：The nuclear-magnetism of the low viscous oil oil reservoir pore structure of hyposmosis is total to
Shake parameter characterization method, the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of the hyposmosis includes：Step 1, lead to
Cross nuclear magnetic resonance experiment under the different low viscous oils of true core saturation to analyze, the rock core nuclear magnetic resonance for obtaining saturation different viscosities oil relaxes
Henan time T2Distribution；Step 2, by the pore Structure Analysis of true core, the pore throat radius r distributions of rock core are obtained；Step 3,
Establish relaxation time T2The benchmark model converted between value and pore throat radius r；Step 4, conversion factor M and fluid viscosity are established and is somebody's turn to do
Rock core T under fluid2Relation between geometrical mean, determine conversion factor M；Step 5, benchmark model is combined with conversion factor
General transformations model is obtained, further according to the T of known oily viscosity number Yu saturation the viscosity oil rock heart2Geometrical mean is by the rock core
NMR relaxation time T2Distribution shifts into pore throat radius r distribution, and then obtain the plan capillary pressure curve of reservoir with
And pore structure distribution and characteristic parameter.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, true core need to carry out oil removing in advance and remove salt treatment, then vacuumize saturation light viscosity oil, next
Nuclear magnetic resonance test is carried out, obtains relaxation time T2Distribution.
In step 1, the method for the high light viscosity oil of saturation uses displacement process, and viscosity from low to high, i.e., is driven with heavy oil
For light viscosity oil, then nuclear magnetic resonance test is carried out to the rock core after displacement saturation each time.
In step 1, its viscosity number of the light viscosity oil used in saturated sample is less than 2mPa.s.
In step 2, the rock core after nuclear magnetic resonance spectroscopy is subjected to oil removal treatment again, then carries out constant pressure pressure mercury point
Analysis, it is ensured that whole analysis and research are carried out on same rock core.
In step 3, select a kind of relatively low oil of viscosity, using low infiltration sandrock true core, according to nuclear magnetic resonance with
Pressure mercury pore Structure Analysis reflects the characteristics of rock core pore structure distribution, the comparative study nuclear magnetic resonance on same rock core
T2Distribution and pore throat radius r distributed datas, T is established using power function relationship2The benchmark mathematical modulo converted between value and pore throat radius r
Type；
T2=C × rn (1)
Wherein：T2For NMR relaxation time, ms；R is pore throat radius, μm；C, n is constant, and acquisition methods are as follows：
C=aln (T2g)+b n=pT2g q (2)
Wherein, a, b, p, q are fitting coefficient；T2gFor rock core T2Geometrical mean, computational methods are as follows：
Wherein, i=1,2 ..., representative take a number, T2, iRepresent the T at each point respectively with Ai2Relaxation time and corresponding
Amplitude；A0Represent relaxation time total amplitude and.
In step 4, by the rock core relaxation time T of the low viscous oil saturation of different viscosities2Same rock core base is arrived in distribution conversion
The relaxation time T of quasi-fluid2Distribution, obtain different conversion factor M, analysis and research conversion factor M and fluid viscosity and the fluid
Lower rock core T2Geometrical mean T2gBetween relation, conversion factor M calculation formula is obtained by regression fit：
M=Aln (μ T2g)+B (4)
Wherein：μ is that need to convert Reference fluid T2Fluid viscosity used in the saturated core of distribution, mPa.s；T2gFor the stream
The T of rock core under body2Geometrical mean, ms；A, B is fitting coefficient.
In steps of 5, the low viscous oil rock core of saturation known-viscosity is subjected to nuclear magnetic resonance spectroscopy, obtains relaxation time T2Point
Cloth and T2g, by the viscosity and T of oil2gConversion factor M is obtained using formula (4), recycles formula (5) and formula (6) just available
The rock core pore throat radius is distributed, and then can obtain intending capillary pressure curve and pore structure distribution and characteristic parameter
C=aln (MT2g)+b n=p (MT2g)q (5)
(MT2)=C × rn (6)。
The nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis in the present invention, is related to microscopic void
The new method of structure quantitative analysis, it is to study the new of the low viscous oil oil reservoir pore structure of hyposmosis using NMR logging data
Method, this method are based on constant pressure intrusive mercury curve and NMR relaxation time T2Distribution reflects the original of rock core distribution of pores
Reason, and the features such as low permeability reservoir hole is fine, viscosity of crude is relatively low are set out, and need to establish zonal benchmark model first, then
According to the NMR relaxation time T of different low viscous oils2Distribution characteristics, establish the Universal Die of the low viscous oil of suitable different viscosities
Type, on this basis, the nuclear magnetic resonance T of this area's oil layer section is obtained using NMR logging data2Distribution, just can be to reservoir
Pore structure carries out continuous, quantitative sign, is reasonable, the effective exploitation of low-permeability oil deposit to carry out evaluating reservoir research
There is provided more comprehensively, more accurately reservoir data.
Brief description of the drawings
Fig. 1 is a specific reality of the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis of the present invention
Apply the flow chart of example；
Fig. 2 is certain the well different depth NMR logging data figure chosen in the specific embodiment of the present invention；
Fig. 3 is the plan capillary pressure curve figure of corresponding depth-logger in a specific embodiment of the invention.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out preferable implementation
Example, and coordinate shown in accompanying drawing, it is described in detail below.
As shown in figure 1, Fig. 1 is the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis of the present invention
Flow chart.
In step 101, nuclear magnetic resonance experiment is analyzed under the different low viscous oils of true core saturation by wanting research area, is obtained
Obtain the rock core NMR relaxation time T of saturation different viscosities oil2Distribution.True core need to carry out oil removing in advance and remove salt treatment,
Saturation is vacuumized again compared with light viscosity oil, is tested followed by nuclear magnetic resonance, is obtained relaxation time T2Distribution.Saturation is more just glued
The method of degree oil uses displacement process, viscosity from low to high, i.e., with heavy oil displacement light viscosity oil, then to displacement saturation each time
Rock core afterwards carries out nuclear magnetic resonance test.Light viscosity oil its viscosity number used in saturated sample is respectively less than 2mPa.s.
In step 102, by the pore Structure Analysis of true core, the pore throat radius r distributions of rock core are obtained.Need to be by nuclear-magnetism
Rock core after resonance analyzing carries out oil removal treatment, then carries out constant-pressure mercury injection again, is same in so whole analysis and research
Carried out on one block of rock core, ensure that the uniformity of analysis and research mesopore gap structure, eliminate due to hole caused by different rock cores
Influence of the gap structure difference to result of study.
In step 103, relaxation time T is established2The benchmark model converted between value and pore throat radius r.Select a kind of viscosity compared with
Low oil, using low infiltration sandrock true core, rock core hole is reflected according to nuclear magnetic resonance and pressure mercury pore Structure Analysis
The characteristics of structure distribution, the comparative study nuclear magnetic resonance T on same rock core2Distribution and pore throat radius r distributed datas, utilize power
Functional relation establishes T2The benchmark mathematical modeling converted between value and pore throat radius r；
T2=C × rn (1)
Wherein：T2For NMR relaxation time, ms；R is pore throat radius, μm；C, n is constant, and acquisition methods are as follows：
C=aln (T2g)+b n=pT2g q (2)
Wherein, a, b, p, q are fitting coefficient；T2gFor rock core T2Geometrical mean, ms, computational methods are as follows：
Wherein, i=1,2 ..., representative take a number, T2, iAnd AiThe T at each point is represented respectively2Relaxation time and corresponding
Amplitude；A0Represent relaxation time total amplitude and.
In step 104, pass through the T to the low viscous oil of multigroup same true core saturation different viscosities2Relaxation time distribution is special
Sign research, establish conversion factor M and rock core T under fluid viscosity and the fluid2Geometrical mean (T2g) between relation, it is determined that folding
Calculate coefficient M.By the rock core relaxation time T of the low viscous oil saturation of different viscosities2Relaxation of the distribution conversion to same rock core Reference fluid
Henan time T2Distribution, obtain different conversion factor M, analysis and research conversion factor M and rock core T under fluid viscosity and the fluid2Geometry
Average value (T2g) between relation, conversion factor M calculation formula is obtained by regression fit：
M=Aln (μ T2g)+B (4)
Wherein：μ is that need to convert Reference fluid T2Fluid viscosity in the saturated core of distribution, mPa.s；T2gFor the fluid
The T of lower rock core2Geometrical mean, ms；A, B is fitting coefficient.
In step 105, benchmark model is combined with conversion factor and just obtains a General transformations model, it is general using this
Model can be by the NMR relaxation time T of low permeability cores under viscosity oil saturation2Point of the distribution shifts into pore throat radius r
Cloth, and then obtain plan capillary pressure curve and pore structure distribution and characteristic parameter of reservoir etc..In one embodiment, utilize
The Nuclear Magnetic Resonance Logging of this area, several depth points are chosen, see Fig. 2, so that it may obtain T2Distribution and characteristic parameter T2g, then by geology
The viscosity of crude data that experimental analysis obtains, conversion factor M is obtained using formula (4), recycles formula (5) and formula (6) just
Rock core pore throat radius distribution can be obtained, and then can obtain corresponding plan capillary pressure curve, sees Fig. 3, and pore structure point
Cloth and characteristic parameter etc., are shown in Table 1.
C=aln (MT2g)+b n=p (MT2g)q (5)
(MT2)=C × rn (6)
The average pore throat radius value of the different depth reservoir of table 1
| Well depth/m | Average pore throat radius/um |
| 3201.6 | 2.15 |
| 3202.2 | 1.21 |
| 3203.4 | 1.12 |
The nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis in the present invention is low for hyposmosis
The application of viscous oil sandstone reservoir Nuclear Magnetic Resonance Logging, obtained by this method can from Nuclear Magnetic Resonance Logging continuous, quantitative
RESERVOIR PORE STRUCTURE parameter, to carry out evaluating reservoir research, provided more comprehensively, more for reasonable, the effective exploitation of LOW PERMEABILITY RESERVOIR
Accurate reservoir data.
Claims (8)
1. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis, it is characterised in that the hyposmosis is low viscous
The nuclear magnetic resonance parameter characterizing method of oil reservoir pore structure includes：
Step 1, analyzed by nuclear magnetic resonance experiment under the different low viscous oils of true core saturation, obtain the rock of saturation different viscosities oil
Heart NMR relaxation time T2Distribution；
Step 2, by the pore Structure Analysis of true core, the pore throat radius r distributions of rock core are obtained；
Step 3, relaxation time T is established2The benchmark model converted between value and pore throat radius r；
Step 4, conversion factor M and rock core T under fluid viscosity and the fluid are established2Relation between geometrical mean, it is determined that conversion
Coefficient M；
Step 5, benchmark model is combined with conversion factor to obtain General transformations model, further according to known oily viscosity number and saturation
The T of the viscosity oil rock heart2Geometrical mean is by the NMR relaxation time T of the rock core2Point of the distribution shifts into pore throat radius r
Cloth, and then obtain the plan capillary pressure curve and pore structure distribution and characteristic parameter of reservoir.
2. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 1, it is special
Sign is that in step 1, true core need to carry out oil removing in advance and remove salt treatment, then vacuumize saturation light viscosity oil, next enter
Row nuclear magnetic resonance is tested, and obtains relaxation time T2Distribution.
3. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 2, it is special
Sign is, in step 1, the method for the high light viscosity oil of saturation uses displacement process, viscosity from low to high, i.e., with heavy oil displacement
Light viscosity oil, then nuclear magnetic resonance test is carried out to the rock core after displacement saturation each time.
4. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 2, it is special
Sign is, in step 1, light viscosity oil its viscosity number used in saturated sample is less than 2mPa.s.
5. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 1, it is special
Sign is, in step 2, the rock core after nuclear magnetic resonance spectroscopy is carried out into oil removal treatment again, then carries out constant-pressure mercury injection,
Ensure that whole analysis and research are carried out on same rock core.
6. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 1, it is special
Sign is, in step 3, selects a kind of relatively low oil of viscosity, using low infiltration sandrock true core, according to nuclear magnetic resonance and pressure
Mercury pore Structure Analysis reflects the characteristics of rock core pore structure distribution, the comparative study nuclear magnetic resonance T on same rock core2
Distribution and pore throat radius r distributed datas, T is established using power function relationship2The benchmark mathematical modulo converted between value and pore throat radius r
Type；
T2=C × rn (1)
Wherein：T2For NMR relaxation time, ms；R is pore throat radius, μm；C, n is constant, and acquisition methods are as follows：
C=aln (T2g)+b n=pT2g q (2)
Wherein, a, b, p, q are fitting coefficient；T2gFor rock core T2Geometrical mean, computational methods are as follows：
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Wherein, i=1,2 ..., representative take a number, T2, iRepresent the T at each point respectively with Ai2Relaxation time and corresponding width
Degree；A0Represent relaxation time total amplitude and.
7. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 6, it is special
Sign is, in step 4, by the rock core relaxation time T of the low viscous oil saturation of different viscosities2Same rock core benchmark is arrived in distribution conversion
The relaxation time T of fluid2Distribution, different conversion factor M are obtained, analyzed and researched under conversion factor M and fluid viscosity and the fluid
Rock core T2Geometrical mean T2gBetween relation, conversion factor M calculation formula is obtained by regression fit：
M=Aln (μ T2g)+B (4)
Wherein：μ is that need to convert Reference fluid T2Fluid viscosity used in the saturated core of distribution, mPa.s；T2gFor under the fluid
The T of rock core2Geometrical mean, ms；A, B is fitting coefficient.
8. the nuclear magnetic resonance parameter characterizing method of the low viscous oil oil reservoir pore structure of hyposmosis according to claim 7, it is special
Sign is, in steps of 5, the low viscous oil rock core of saturation known-viscosity is carried out into nuclear magnetic resonance spectroscopy, obtains relaxation time T2Point
Cloth and T2g, by the viscosity and T of oil2gConversion factor M is obtained using formula (4), recycles formula (5) and formula (6) just available
The rock core pore throat radius is distributed, and then can obtain intending capillary pressure curve and pore structure distribution and characteristic parameter
C=aln (MT2g)+b n=p (MT2g)q (5)
(MT2)=C × rn (6)。
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| CN112577881A (en) * | 2020-12-31 | 2021-03-30 | 煤炭科学技术研究院有限公司 | Low-permeability coal seam multi-scale micro-pore structure fine characterization method |
| CN113588704A (en) * | 2021-08-01 | 2021-11-02 | 西南石油大学 | Separation method of nuclear magnetic resonance signals of immiscible fluid in rock core |
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