CN112858131A - Characterization method of micro-pores in chlorite-containing clastic rock reservoir - Google Patents
Characterization method of micro-pores in chlorite-containing clastic rock reservoir Download PDFInfo
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- G01—MEASURING; TESTING
- 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
Abstract
A characterization method of micro pores in a chlorite-containing clastic rock reservoir relates to the technical field of oil and gas exploration and development and comprises the following steps: s1: collecting a plurality of core plunger samples; s2: measuring the porosity and permeability of the core plunger sample, and screening out a primary sample; s3: sampling the primary sample, observing the occurrence state of chlorite in the first sample by using a microscope, and screening out an intermediate sample with good chlorite development; s4: sampling the intermediate sample, performing an X-diffraction experiment on the second sample, and determining the content of chlorite according to an X-diffraction numerical value; s5: sampling the intermediate sample, and performing a high-pressure mercury injection test on the third sample to measure the micro-pore structure parameters of the intermediate sample; s6: loop characteristics of the porosity, the chlorite content and the micro-pore structure parameters are obtained; s7: and analyzing the relationship between the chlorite content and the micro-pore structure of the intermediate sample according to the loop characteristics to obtain the oil and gas storage performance of the intermediate sample at the corresponding depth in the clastic rock reservoir.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a characterization method of micro pores in a chlorite-containing clastic rock reservoir.
Background
The authigenic chlorite is a common diagenetic mineral in clastic rock reservoirs, and the content, the output state, the space-time distribution and the like of the authigenic chlorite have important significance for the preservation of the native pores of the reservoirs. The effect of authigenic chlorite on reservoirs has been a focus of domestic and foreign research, as early as the 50's in the 20 th century, when Heald studied authigenic minerals in the sandstone of West Virginia, noted an authigenic chlorite ring around the secondary growth of clastic particles or quartz, and indicated that this chlorite originated from the original deposit.
At present, with the progress of oil and gas exploration and development and the continuous improvement of technology, the proportion of compact oil and gas is continuously improved, the formation mechanism of a compact clastic rock reservoir becomes one of hot subjects of research, and the research on the influence of authigenic chlorite on the reservoir is mainly based on a conventional reservoir; most scholars think that the chlorite envelope and the pore lining chlorite with a certain thickness play a constructive role in storing and modifying primary pores, the primary pores are stored by slowing down the compaction action and inhibiting the secondary increase of quartz, the carbonate cementation action is facilitated, the compaction resistance of a reservoir can be increased, the quality of a compact clastic rock reservoir is improved, and the pores of the compact clastic rock reservoir are protected.
For a compact clastic rock reservoir, a micro-nano pore throat is a very important component in pores, a micro-pore structure is one of key factors for controlling the final development effect of a low-permeability and ultra-low-permeability sandstone reservoir, the influence of authigenic chlorite on the micro-pore structure of the compact clastic rock reservoir is not clear, and a characterization method for the micro-pores in the clastic rock reservoir containing chlorite is not available so far. Therefore, there is a need for a method of characterizing microscopic pores in a chlorite containing clastic reservoir that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides a method for characterizing microscopic pores in a chlorite-containing clastic rock reservoir.
The purpose of the invention can be realized by the following technical scheme: a method for characterizing microscopic pores in a chlorite-containing clastic rock reservoir sequentially comprises the following steps:
s1: collecting a plurality of core plunger samples;
s2: measuring the porosity and the permeability of the core plunger sample collected in the step S1, and screening out the core plunger sample with the permeability being more than 0.1 as a primary sample;
s3: sampling the primary sample screened in the step S2 to prepare a first sample, observing the occurrence state of chlorite in the first sample by using a microscope, and screening out an intermediate sample with well-developed chlorite;
s4: sampling the intermediate sample screened in the step S3, making two samples II, performing an X-ray diffraction experiment on the samples II, and determining the content of chlorite according to the measured X-ray diffraction value;
s5: sampling the intermediate sample screened in the step S3, manufacturing a third sample, and performing a high-pressure mercury injection test on the third sample to measure the micro-pore structure parameters of the intermediate sample;
s6: loop characteristics of the porosity, the chlorite content and the micro-pore structure parameters are obtained;
s7: and analyzing the relationship between the chlorite content and the micro-pore structure of the intermediate sample according to the loop characteristics in the step S6 to obtain the oil and gas storage performance of the intermediate sample at the corresponding depth in the clastic rock reservoir.
Preferably, in the step S2, before the porosity and the permeability are measured, the core plug sample is deoiled by using an ethanol benzene compound, the deoiled core plug sample is measured for liquid saturation porosity by using a compact rock vacuum saturation device and an electronic balance, and then the air permeability of the core plug sample is measured by using a core permeability measuring instrument.
Preferably, the specific operation of step S3 is: cutting and sampling the primary sample screened in the step S2 to prepare a first sample, wherein the first sample is a casting body slice; then, the cast body slice is optically observed by a polarizing microscope, the occurrence state of chlorite in the cast body slice is observed, and an intermediate sample with well-developed chlorite is screened out.
Preferably, the specific operation of step S3 is: sampling the preliminary sample screened in the step S2 to prepare a first sample, drying the first sample, performing vacuum gold plating treatment on the dried first sample, observing the first sample by using a scanning electron microscope after the vacuum gold plating is finished, observing the occurrence state of chlorite in the first sample, and screening out an intermediate sample with well-developed chlorite.
Preferably, in the step S4, the X-ray diffraction experiment includes an X-ray diffraction experiment of the whole rock and an X-ray diffraction experiment of the relative content of the clay mineral, and the two samples are respectively subjected to the X-ray diffraction experiment of the whole rock and the X-ray diffraction experiment of the relative content of the clay mineral.
Preferably, in step S4, the sample two processing for the X-ray diffraction experiment of the whole rock is: before the whole-rock X-ray diffraction experiment, drying the sample, grinding the dried sample to powder with the particle size of less than 40 mu m, and performing the whole-rock X-ray diffraction experiment on the powder.
Preferably, in the step S4, the second sample treatment for the X-ray diffraction experiment of the relative content of the clay mineral is: before the test, the sample is crushed to 5mm of particle size, washed by deionized water, after clay is suspended, the suspension is absorbed for settlement treatment, the settled sample is dried and then ground into powder, and the powder is subjected to an X-ray diffraction test of the relative content of clay minerals.
Preferably, in step S5, before the high-pressure mercury intrusion test is performed on the sample three, the sample three is deoiled, particles with a weight of 2-3g and a particle size of 2-3mm are selected from the sample three, the particles are dried and then are placed into an expansion gauge, the expansion gauge is vacuumized and degassed, liquid mercury is injected, pore detection is performed under a high-pressure condition, and the micro-pore structure parameters of the intermediate sample are measured.
The invention has the advantages that: according to the characterization method provided by the invention, the porosity and permeability of the sample are measured, the occurrence state of chlorite in the sample is observed by optical observation and a scanning electron microscope to determine the occurrence state and the period of chlorite, further the development condition of the authigenic chlorite is determined, the content of chlorite in a clastic rock reservoir is determined by an X-diffraction experiment, the parameter of micro-porosity is measured by a low-temperature nitrogen adsorption experiment, and the relationship between the content of authigenic chlorite and the pore structure is obtained by comprehensively and objectively analyzing the measured parameter.
Drawings
FIG. 1 is a microscopic view showing the occurrence of chlorite in example 2 of the present invention.
FIG. 2 is a table showing the occurrence and content of clay minerals obtained by X-ray diffraction experiments in example 2 of the present invention.
FIG. 3 is a comparative histogram of the mineral content and relative content of clay from the X-ray diffraction experiments of example 2 of the present invention.
Fig. 4 is a table of the data for the parameters of the micro-pore structure obtained from high pressure mercury injection in example 2 of the present invention.
FIG. 5 is a graph of the relative chlorite content versus micron-scale porosity for the study area in example 2 of the present invention.
FIG. 6 is a graph showing the mercury ingress and mercury egress curves for a portion of the samples from the study area of example 2 of the present invention.
FIG. 7 is a plot of pore throat radius distribution for a portion of a sample of the area of interest in example 2 of the present invention.
FIG. 8 is a graph of the relative chlorite content versus porosity for the study area in example 2 of the present invention.
FIG. 9 is a statistical table of the well face porosity of the north 202 well in example 2 of the present invention.
Wherein like parts are designated by like reference numerals throughout the several views; the figures are not drawn to scale.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1
The purpose of the invention can be realized by the following technical scheme: a method for characterizing microscopic pores in a chlorite-containing clastic rock reservoir sequentially comprises the following steps:
s1: collecting a plurality of core plunger samples, wherein the diameter of each sample is 2.5cm, the length of each sample is more than 3cm, two samples are collected at each depth when the samples are collected, one core plunger sample consists of the two samples, and because the sample dosage of an X-diffraction experiment is large, one core plunger sample is used for the X-diffraction experiment of the experiment, and the other core plunger sample is used for other experiments, so that the influence of the heterogeneity of the samples on the result of the microscopic experiment is reduced;
s2: determining porosity and permeability of the core plunger sample collected in the step S1, before determining the porosity and the permeability, performing deoiling treatment on the core plunger sample by using an ethanol benzene compound, determining the liquid saturation porosity of the core plunger sample by using a KX-90G type compact rock vacuum saturation device and an electronic balance, determining the air permeability of the core plunger sample by using an ECK-III type core permeability tester, and screening out the core plunger sample with the permeability of more than 0.1 as a primary sample;
s3: sampling the primary sample screened in the step S2 to prepare a first sample, adhering the first sample on a sample pile, drying the first sample in a drying oven at 50 ℃ for 24 hours, blowing off dust on the surface of the first sample by using an ear washing ball, and then placing the first sample on a vacuum coating machine for gold plating to enable the first sample to be conductive; and (3) putting the sample I subjected to vacuum gold plating into a sample chamber of an S-4800 cold field emission scanning electron microscope, observing by using a scanning electron microscope, observing the occurrence state of chlorite in the sample I, and screening out an intermediate sample with well-developed chlorite.
S4: sampling the intermediate sample screened in the step S3, making two samples II, performing an X-ray diffraction experiment on the samples II, and determining the content of chlorite according to the measured X-ray diffraction value;
the X-ray diffraction experiment comprises an X-ray diffraction experiment of the whole rock and an X-ray diffraction experiment of the relative content of clay minerals, the X-ray diffraction experiment of the whole rock and the X-ray diffraction experiment of the relative content of the clay minerals are respectively carried out on two samples II, the X-ray diffraction experiment of the whole rock is used for measuring the content of clay in the samples, chlorite is one of the clay minerals, and therefore the X-ray diffraction experiment of the relative content of the clay minerals is used for measuring the content of chlorite in the clay;
the second sample treatment for the whole rock X-ray diffraction experiment comprises the following steps: before the X-ray diffraction experiment of the whole rock, a sampling sample is placed in a drying oven at 40 ℃ for drying for two days, then an agate mortar is used for grinding the sample to powder with the particle size of less than 40 mu m so as to thoroughly disperse the rock, and then the X-ray diffraction experiment of the whole rock is carried out on the powder;
the second sample treatment for the X-ray diffraction experiment of the relative content of the clay minerals comprises the following steps: before the test, a sampling sample is crushed to 5mm of particle size, the sample is soaked in deionized water and then is taken out of impurities by using hydrogen peroxide, or deionized water is used for repeatedly washing and removing the impurities, after clay is suspended, suspension liquid with the particle size smaller than 2 mu m is absorbed for centrifugal sedimentation treatment, the sample after the centrifugal sedimentation is placed in a drying box at 40 ℃ for drying, after drying, the sample is ground by an agate mortar to powder without granular feeling when being touched, and the powder is subjected to an X-ray diffraction experiment of the relative content of clay minerals.
Wherein, X' Pert PRO MPD type X-ray diffractometer (PANALYTICAL, Holland) is adopted in the X-ray diffraction experiment, the voltage of an X-ray tube is 40KV, the current is 40mA, and the sampling step width is 0.02 degrees.
S5: sampling the intermediate sample screened in the step S3 to prepare a third sample, deoiling the third sample by using an ethanol benzene compound, selecting particles with the weight of 2-3g and the particle diameter of 2-3mm from the deoiled third sample, drying the particles at the temperature of 110 ℃, filling the dried particles into a glove box filled with nitrogen gas, wherein the volume of the glove box is 1cm3And finally, the dilatometer with the particles is transferred into a measurement and control instrument, the measurement and control instrument is vacuumized in a low-pressure environment for degassing treatment, liquid mercury is injected into the dilatometer after degassing treatment, and finally the dilatometer is placed into a high-pressure mercury-pressing test instrument for pore detection to measure the micro-pore structure parameters of the intermediate sample.
S6: loop characteristics of the porosity, the chlorite content and the micro-pore structure parameters are obtained;
s7: and analyzing the relationship between the chlorite content and the micro-pore structure of the intermediate sample according to the loop characteristics in the step S6 to obtain the oil and gas storage performance of the intermediate sample at the corresponding depth in the clastic rock reservoir. .
In some other preferred embodiments, the technical means for observing the occurrence state of the chlorite in the step S3 may be: preparing a casting body slice from the first sample, and optically observing the casting body slice by using a polarizing microscope, wherein the specific operation steps are as follows:
s3: cutting the preliminary sample selected in step S2 to produce a cast sheet, the cast sheet production step being: cutting a sample slice from a primary sample, soaking the sample slice in blue epoxy resin, removing gas in the sample slice in vacuum in the whole soaking process, polishing the sample slice to the thickness of 30mm after the blue epoxy resin is cured to prepare a casting slice, optically observing the slice by using a Zeiss (AX-ioplan 2imaging) polarizing microscope, observing the occurrence state of chlorite in the casting slice, and screening out an intermediate sample with well-developed chlorite.
The scanning electron microscope observation and the optical observation aim at obtaining occurrence states of chlorite in a sampling sample and screening out an intermediate sample with good chlorite development, and the two technical means can be implemented independently or synchronously after the sampling sample is obtained respectively in the same embodiment.
Example 2
The research area of this example 2 is the sampling of the minor concavity of the Longfeng mountain of the long ridge of the Songliao basin
1. Sample testing
Totally acquiring 131 core plunger samples, and performing test analysis processing on the 131 (totally 262) core plunger samples according to the characterization method in the embodiment 1, wherein the method specifically comprises the following steps: testing and analyzing the porosity and permeability of the front parts of the 131 core plunger samples; cutting casting body slices, performing optical observation on the slices by 131 slices, and observing the slices by a scanning electron microscope by 20 slices; carrying out total rock X-ray diffraction experiments on 82 samples and X-ray diffraction experiments on the relative content of clay minerals of 38 samples; and 29 samples in which authigenic chlorite had developed were subjected to high-pressure mercury intrusion experiments.
2. Through optical observation and scanning electron microscope observation, the chlorite has three occurrence states in a research area:
(1) the granule coated chlorite, as shown in fig. 1A, grows in a thin film shape perpendicular to the granule surface, usually less than 1 μm in thickness, and covers the granule surface, the granule contact position is distributed parallel to the granules due to extrusion, and the chlorite crystal is needle-shaped, plate-shaped or honeycomb-shaped.
(2) Pore-lined chlorite, as shown in fig. 1B-D, is the primary production form of authigenic chlorite in research areas, typically developing as a comb shell at the pore edges beyond the particle contact points, with the chlorite crystals being needle-like or bamboo leaf-like. The thickness is 5-15 μm, chlorite lining in north 202 well hole gaps grows most, the thickness is the thickest (average is 15 μm), and the continuity is the strongest.
(3) The pores are filled with chlorite, as shown in FIG. 1D, in the form of velvet balls, rosettes or dispersed monomers, and the crystal growth direction is not directional.
In the attached fig. 1: (A) granule coated chlorite, north 202 wells, 3087.48m, SEM. (B) Pore-lined chlorite, north 202 well, 3117.8m, polarizing microscope. (C) Pore-lined chlorite, north 210 well, 3949.75m, polarizing microscope. (D) Pore lining and pore packing chlorite, north 202 well, 3113.28m, SEM.
The English notation in the attached figure 1 means: Ch-Chlorite; Q-Quartz; pore-lining chlorite-pore-lining chlorite; pore-filling chloride-pore filling chlorite.
3. Determination of chlorite content by X-ray diffraction experiments
As shown in FIG. 2, which is a data table of the occurrence and content of clay minerals obtained from X-ray diffraction experiments, samples with a clay mineral content of 10% or less in the study area account for 80% or more of the total samples, and samples with a clay mineral content of more than 15% only account for 10% or less of the total samples.
As shown in fig. 3A, the clay mineral content in the study area is relatively small in terms of the total amount of clay minerals.
As shown in FIG. 3B, the clay mineral types in the research area are mainly chlorite, illite and illite, and are substantially free of kaolinite, and the proportion of samples with a chlorite relative content of more than 60 percent is about 20 percent, which indicates that chlorite is an important clay mineral type in the research area.
4. Measuring micro-pore structure parameters of sample by high-pressure mercury-pressing test
FIG. 4 is a table of data of parameters of micro-pore structure obtained by high-pressure mercury injection, and the results show that the displacement pressure (Pd) of 29 samples in the research area is distributed between 0.260MPa and 48.233MPa, and the average pressure is 4.814 MPa; the saturation median pressure (P50) is between 11.149MPa and 172.938MPa, and the average is 53.988 MPa; the maximum pore throat radius (rmax) is between 0.015 and 2.822 μm, with an average of 0.593 μm; the average pore throat radius (r ^) is between 0.006 and 0.429 mu m, and the average pore throat radius is 0.101 mu m; the median radius of pore throat (r50) is between 0.005 μm and 0.068 μm, and the average is 0.023 μm; the maximum mercury inlet saturation (SHgmax) is between 53.375% and 96.629%, and the average is 90.987%.
As shown in fig. 5, which is a graph of the relative content of chlorite in the research area versus micron-sized pores, the displacement pressure (Pd) of the samples for the development of chlorite with pore lining is small and is between 0.469MPa and 2.740 MPa; the mercury saturation (SHgmax) is higher and is between 85.454% and 95.354%; the saturation median pressure (P50) is small and is between 11.149MPa and 27.681 MPa.
FIG. 6 is a graph showing the mercury ingress and mercury egress curves for a portion of the samples in the study area, where FIG. 6(a) is a sample containing pore-lined chlorite; for comparison convenience, a high-pressure mercury-pressing test is also carried out on a sample without a part of pore lining chlorite, a mercury feeding and mercury removing curve chart is shown in figure 6(b), and the displacement pressure (Pd) of the sample without developing the pore lining chlorite is relatively larger and is between 0.674MPa and 5.496 MPa; the mercury saturation (SHgmax) is low and is between 53.375% and 90.268%; the saturation median pressure (P50) is large and is between 51.125MPa and 172.398 MPa.
FIG. 7 is a plot of the pore throat radius distribution of a portion of a sample of the study area, where FIG. 7(a) is a sample containing pore-lined chlorite and FIG. 7(b) is a sample without pore-lined chlorite for comparison purposes; as shown in fig. 7(a), the pore throat radius distribution of the pore lining chlorite developed samples was relatively uniform, with relatively large pore throat radii; as shown in fig. 7(b), the pore throat radius distribution of the sample of undeveloped pore lining chlorite was more concentrated, in a bimodal morphology, with relatively small pore throat radii, mainly concentrated below 0.01 μm.
5. Analysis of relationship between chlorite and porosity
FIG. 8 is a graph showing the relationship between the relative chlorite content and the porosity in the study area; as shown in fig. 9, is a statistical table of north 202 well face porosity.
Fig. 8 shows that there is a correlation between the relative content of authigenic chlorite and the porosity, with higher relative chlorite content providing greater porosity. The results shown in fig. 9 show that: the reservoir stratum with the chlorite shell has high primary pore surface porosity, wherein the primary pore surface porosity accounts for 53.314-83.597% of the total surface porosity and is 64.997% on average, so that the chlorite shell mainly plays a role in protecting the primary pores.
6. Analysis of relationship between chlorite content and micro-pore structure
As shown in fig. 5, there is a certain correlation between the relative chlorite content and the micron-sized pores in the research area, and as the relative chlorite content increases, the maximum mercury saturation gradually increases, the saturation median pressure gradually decreases, and the pore throat median radius increases.
The method shows that in the background of overall compact reservoir, the micron-sized pores in the reservoir with relatively developed authigenic chlorite are more, the storage capacity is better, the saturation median pressure is small, and the pore throat median radius is large, so that the proportion of the large pore throat in the pores is larger, the pore structure of the reservoir is better, and the storage performance is stronger.
The invention has been described above with reference to preferred embodiments, but the scope of protection of the invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the scope of protection of the invention. Various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict.
Claims (8)
1. A method for characterizing microscopic pores in a chlorite-containing clastic rock reservoir is characterized by sequentially comprising the following steps:
s1: collecting a plurality of core plunger samples;
s2: measuring the porosity and the permeability of the core plunger sample collected in the step S1, and screening out the core plunger sample with the permeability being more than 0.1 as a primary sample;
s3: sampling the primary sample screened in the step S2 to prepare a first sample, observing the occurrence state of chlorite in the first sample by using a microscope, and screening out an intermediate sample with well-developed chlorite;
s4: sampling the intermediate sample screened in the step S3, making two samples II, performing an X-ray diffraction experiment on the samples II, and determining the content of chlorite according to the measured X-ray diffraction value;
s5: sampling the intermediate sample screened in the step S3, manufacturing a third sample, and performing a high-pressure mercury injection test on the third sample to measure the micro-pore structure parameters of the intermediate sample;
s6: loop characteristics of the porosity, the chlorite content and the micro-pore structure parameters are obtained;
s7: and analyzing the relationship between the chlorite content and the micro-pore structure of the intermediate sample according to the loop characteristics in the step S6 to obtain the oil and gas storage performance of the intermediate sample at the corresponding depth in the clastic rock reservoir.
2. The method of characterizing micro-pores in a chlorite-containing clastic rock reservoir, according to claim 1, wherein in the step S2, before the porosity and the permeability are measured, the core plug sample is deoiled using an ethanol benzene compound, the deoiled core plug sample is subjected to a dense rock vacuum saturation device and an electronic balance to measure a liquid saturation porosity, and then the core plug sample is subjected to a core permeability tester to measure an air permeability.
3. The method for characterizing the microscopic pores in a chlorite-containing clastic rock reservoir as recited in claim 1, wherein said step S3 is performed by: cutting and sampling the primary sample screened in the step S2 to prepare a first sample, wherein the first sample is a casting body slice; then, the cast body slice is optically observed by a polarizing microscope, the occurrence state of chlorite in the cast body slice is observed, and an intermediate sample with well-developed chlorite is screened out.
4. The method for characterizing the microscopic pores in a chlorite-containing clastic rock reservoir as recited in claim 1, wherein said step S3 is performed by: sampling the preliminary sample screened in the step S2 to prepare a first sample, drying the first sample, performing vacuum gold plating treatment on the dried first sample, observing the first sample by using a scanning electron microscope after the vacuum gold plating is finished, observing the occurrence state of chlorite in the first sample, and screening out an intermediate sample with well-developed chlorite.
5. The method of characterizing micro-pores in a chlorite-containing clastic rock reservoir of claim 1, wherein in step S4, the X-ray diffraction experiments include X-ray diffraction experiments on whole rock and relative clay mineral content, and the X-ray diffraction experiments on whole rock and relative clay mineral content are performed on two samples respectively.
6. The method for characterizing the microscopic pores in a chlorite-containing clastic rock reservoir as claimed in claim 5, wherein in the step S4, the sample two treatments for the X-ray diffraction experiment of the whole rock are: before the whole-rock X-ray diffraction experiment, drying the sample, grinding the dried sample to powder with the particle size of less than 40 mu m, and performing the whole-rock X-ray diffraction experiment on the powder.
7. The method of characterizing the microscopic pores in a chlorite-containing clastic rock reservoir of claim 6, wherein in step S4, sample two of the X-ray diffraction experiments conducted on the relative content of clay minerals is: before the test, the sample is crushed to 5mm of particle size, washed by deionized water, after clay is suspended, the suspension is absorbed for settlement treatment, the settled sample is dried and then ground into powder, and the powder is subjected to an X-ray diffraction test of the relative content of clay minerals.
8. The method of claim 1, wherein in step S5, before the high pressure mercury intrusion test is performed on the sample three, the sample three is deoiled, particles with a weight of 2-3g and a particle size of 2-3mm are selected, the particles are dried and then placed into an dilatometer, the dilatometer is vacuumized and degassed, and then liquid mercury is injected and pore detection is performed under high pressure conditions, and the micro pore structure parameters of the intermediate sample are measured.
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