CN112304734A - Method for judging organic matter type of hydrocarbon source rock - Google Patents
Method for judging organic matter type of hydrocarbon source rock Download PDFInfo
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- 239000005416 organic matter Substances 0.000 title claims abstract description 71
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 51
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 51
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 70
- 239000011707 mineral Substances 0.000 claims abstract description 67
- 239000010426 asphalt Substances 0.000 claims abstract description 59
- 239000011159 matrix material Substances 0.000 claims abstract description 51
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005498 polishing Methods 0.000 claims abstract description 31
- 238000002791 soaking Methods 0.000 claims abstract description 20
- 239000004079 vitrinite Substances 0.000 claims abstract description 12
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A method for judging the organic matter type of a hydrocarbon source rock comprises the following steps: preparing a whole rock slide sample of the source rock, and comprises the steps of pretreatment and preparation of the sample, inlaying and polishing; classifying, identifying and counting microscopic components of the sample under a microscope; cold soaking the whole rock slide in chloroform for 12 hours; repeating the process of the step 2 on the soaked whole rock slide; calculating the percentage content of amorphous organic matter in the mineral asphalt matrix; calculating the percentage content of amorphous organic matters in the mineral asphalt matrix into a sapropel group, and calculating a type index TI value according to the relative percentage content of the sapropel group, the chitin group, the vitrinite group and the inert group; and dividing the organic matter type of the hydrocarbon source rock according to the TI value. The invention can eliminate the error caused by observing and calculating the type index of the mineral asphalt under the microscope of the hydrocarbon source rock micro-components and the interference on the classification of the organic matter type of the hydrocarbon source rock, thereby ensuring that the classification, identification and statistics work based on the microscope micro-components and the corresponding classification of the organic matter type of the hydrocarbon source rock are more accurate and objective.
Description
Technical Field
The invention relates to a method for judging the type of organic matters of a hydrocarbon source rock. In particular to a method for judging the organic matter type of the hydrocarbon source rock.
Background
In organic rock science, organic components that are microscopically identifiable are referred to as "organic microcomponents". According to the difference of the biological organic composition and the geological and geochemical action types experienced by the biological organic composition, the optical characteristics under a microscope are taken as identification bases, and the microscopic components in the deposited organic matter can be divided into a plurality of types. The determination of the content of each component through under-mirror observation is a classical method for distinguishing the organic matter type (or called kerogen type) of the hydrocarbon source rock, is used as an important ring for evaluating the hydrocarbon source rock, and is widely applied to the present day in the field of oil and gas exploration at home and abroad. The hydrocarbon source rock organic matter type is an important basis for calculating the oil and gas-containing basin resource amount, and whether the hydrocarbon source rock organic matter type relation is accurate in oil and gas storage amount calculation in the basin is correctly judged, so that the hydrocarbon source rock organic matter type has an important influence on oil and gas resource evaluation work.
However, in the experimental process, the existence of mineral asphalt in an analysis sample can interfere the identification of the whole rock micro-components under a microscope, and a mineral asphalt matrix does not belong to the typical organic matter category, so that the mineral asphalt matrix cannot be directly used as a micro-component to be evaluated, but a large amount of sub-microscopic amorphous organic matters exist in the mineral asphalt matrix, and the content of the amorphous organic matters even exceeds the content of morphological hydrogen-rich components, so that the division of the organic matter type of the hydrocarbon source rock is directly influenced. The type result obtained is different from the organic matter type obtained through hydrocarbon source rock element analysis and pyrolysis analysis, and is not accurate enough.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for judging the organic matter type of the hydrocarbon source rock, which can judge the organic matter type of the sample more accurately and meet the evaluation requirement of the hydrocarbon source rock.
The technical scheme adopted by the invention is as follows: a method for judging the organic matter type of a hydrocarbon source rock comprises the following steps:
1) preparing a whole rock slide sample of the source rock, and comprises the steps of pretreatment and preparation of the sample, inlaying and polishing;
2) classifying, identifying and counting microscopic components of the sample under a microscope;
3) cold soaking the whole rock slide in chloroform for 12 hours;
4) repeating the step 2) on the soaked full rock slide;
5) calculating the percentage content of amorphous organic matter in the mineral asphalt matrix;
6) calculating the percentage content of amorphous organic matters in the mineral asphalt matrix into a sapropel group, and calculating a type index TI value according to the relative percentage content of the sapropel group, the chitin group, the vitrinite group and the inert group;
7) and dividing the organic matter type of the hydrocarbon source rock according to the TI value.
The method for judging the type of the organic matter of the source rock can eliminate errors caused when mineral asphalt is observed and calculated under a micro-component lens of the source rock and interference caused by the division of the Type Index (TI) of the source rock organic matter, so that the classification, identification and statistical work based on the microscopic micro-component and the corresponding division of the type of the source rock organic matter are more accurate and objective, and the result can be verified with the kerogen element division and the rock pyrolysis analysis result mutually. And the resource amount of the oil-gas-containing basin is calculated, so that reliable guidance is provided for oil-gas exploration and development work.
Drawings
FIG. 1 is a trigonometric view of the composition division (mineral-containing bituminous matrix marking-out humus mud group) of a certain constructed hydrocarbon source rock in a Bohai sea oil field;
FIG. 2 is a component division (without mineral asphalt matrix) triangular diagram of a hydrocarbon source rock of a certain structure in a Bohai sea oil field;
FIG. 3 is a trigonometric view of composition division (amorphous organic matter putrid mud group in mineral asphalt matrix) of a certain structure hydrocarbon source rock in a Bohai sea oil field;
FIG. 4a is a graph of upper east two segments (E) judged by maximum pyrolysis temperature (Tmax) -Hydrogen Index (HI) of source rock3d2 U) A mudstone organic matter type;
FIG. 4b is a graph showing the determination of the upper east two segment (E) according to the maximum pyrolysis temperature (Tmax) -Hydrogen Index (HI) of the source rock3d2 L) A mudstone organic matter type;
FIG. 4c is a graph of the east three segments (E) judged by the maximum pyrolysis temperature (Tmax) -Hydrogen Index (HI) of the source rock3d3) A mudstone organic matter type;
FIG. 4d is a graph of sand fraction (E) as judged by maximum pyrolysis temperature (Tmax) -Hydrogen Index (HI) for source rock3s1) A mudstone organic matter type;
fig. 5 is a flow chart of a method of determining organic matter type of a source rock according to the present invention.
Detailed Description
The following provides a detailed description of a method for determining the organic matter type of a source rock according to the present invention with reference to the following embodiments and accompanying drawings.
The mineral asphalt matrix is not a traditional organic micro-component, is a special micro-component newly found in organic petrology research, and is actually a complex of micro organic matters and inorganic minerals. Therefore, it is not suitable to classify all mineral asphalt matrixes into the sapropel group or to remove all mineral asphalt matrixes from the sapropel group, and the type of the organic matters of the hydrocarbon source rock can be accurately evaluated by using the composition of the whole rock micro-components only by separating the organic matters existing in the mineral asphalt matrixes and carrying out statistics independently.
According to the method for judging the type of the organic matter of the hydrocarbon source rock, disclosed by the invention, an experimental method is improved, a pretreatment link is added, a sample is soaked by using chloroform, the composition analysis of all-rock micro-components is carried out after all the organic matters in mineral asphalt are dissolved, the reduction value of a mineral asphalt matrix can be obtained, the reduction value is used as an amorphous organic matter and is classified into a sapropel group, the percentage content of each component is counted again, and the type of the organic matter is judged. Compared with the traditional experimental method, the method has the advantages that the newly added processing steps are simple, convenient and quick, the judgment on the organic matter type of the sample is more accurate, the evaluation requirement of the hydrocarbon source rock can be met, and the operability is very strong.
As shown in fig. 5, a method for determining an organic matter type of a source rock according to the present invention includes the following steps:
1) preparing a whole rock slide sample of the source rock, and comprises the steps of pretreatment and preparation of the sample, inlaying and polishing; the method comprises the following steps:
(1.1) taking not less than 10g of a sample to be analyzed, crushing the rock sample by using a copper mortar to obtain a rock sample with the particle size of 0.5-1 mm, and taking at least 5g of the rock sample to be prepared into a reflecting light sheet; the samples required for preparation should remain as dry as possible and free of oil contamination.
(1.2) mixing the prepared sample and organic glass powder according to the volume ratio of 3:2, putting the mixture into an inlaying machine, paying attention to the fact that the sample mixture is uniformly distributed on the bottom surface of the sleeve piston as far as possible, slowly adding 15ml of organic glass powder, and finally placing a label;
(1.3) setting the working conditions of the thermal inlaying machine as follows: inlaying the transparent material, heating at 120 ℃ for 15min, pressurizing to 310bar, cooling for 7min, starting a working button, and taking out the polished section after the inlaying machine finishes inlaying and sounds a reminder;
(1.4) placing the inlaid polished section in a fixture of a Puruis automatic polishing machine for polishing, wherein the surface of the polished section containing a sample faces downwards during placement, and setting programs and conditions of all polishing procedures on a touch screen after the Puruis automatic polishing machine needs to be started up:
a) the pre-polishing piece of the P600 waterproof abrasive paper is a plane, the rotating speed is adjusted to be 100r/min, the pre-polishing time is 1min, and the water spraying mode is kept on;
b) the method comprises the following steps of (1) roughly polishing a P1200 waterproof abrasive paper sheet, adjusting the rotating speed to 150r/min, keeping the rough grinding time for 3min, and keeping the water spraying mode on;
c) p3600 fine polishing sheet of water sand paper, adjusting the rotating speed to 200r/min, keeping the fine polishing time for 3min, and keeping the water spraying mode to be started;
d) roughly polishing for 3min by using polishing solution of 3 mu, adjusting the rotating speed to 200r/min and keeping the water spraying mode closed;
e) fine polishing for 3min by using polishing solution of 1 mu, adjusting the rotating speed to be 100r/min and keeping the water spraying mode closed;
f) cleaning the polished section by using an ultrasonic cleaner; (note: the polishing process cannot be reversed, tap water is needed to flush each process after completion, and the polishing conditions are not fixed, and the working conditions need to be properly adjusted according to the type of the sample).
g) And (3) observing under a dry objective, wherein the polished surface of the polished section has no stain, no needle-shaped scratch, no cloth mark, clear component boundary and no scribing and grinding point, placing the polished section in a dryer for standing for 12h after the polished section is qualified, and finishing the preparation of the sample.
2) Classifying, identifying and counting microscopic components of the sample under a microscope;
wherein: the identification process is executed according to the content of the oil and gas industry standard SY/T6414-2014 & lt & ltwhole rock light sheet micro-composition identification and statistical method & gt & lt; observing the microscopic components according to the characteristics of the microscope under oil immersion reflected light and fluorescence characteristics; the classification and naming of the micro-components are based on the micro-components of coal and a classification method according to the organic matter of the continental facies or the marine facies hydrocarbon source rock in China; the microscopic components in the hydrocarbon source rock are characterized in that the wavelength of a fluorescence excitation light source is 410-530 nm, and the reflected white light refers to oil-immersed reflected light. The classification, identification and statistics of microscopic components of a sample specifically comprise:
(2.1) placing the flattened polished section on an objective table, dripping immersion oil, focusing by a microscope, and correcting the center of an objective lens;
(2.2) adjusting the aperture and the aperture field and the aperture size to ensure that the light rays in the field are uniform and the image is clear;
(2.3) identifying and distinguishing by alternately observing oil-immersed reflected light and reflected fluorescence during observation, wherein the observation object comprises: the volume fraction is carried out by adopting a point counting method or an eye estimation method in the statistical process, and the original record is filled according to the statistical result; wherein the content of the first and second substances,
the point counting method is used for coal and carbonaceous mudstone samples with high organic matter abundance, and firstly, the moving step pitch of the objective table is determined to be 0.4-0.6 mm; more than 600 effective measuring points are guaranteed to be uniformly distributed on the whole plate; fixing an object stage, identifying which type of microscopic component or mineral the effective substance under the intersection point of the cross line of the ocular from one end of a sample, recording the effective substance into corresponding counting keys or statistical software, and gradually moving along a fixed direction according to a set step length, wherein if the intersection point of the cross line falls on a cementing material (such as epoxy resin and the like), a cell cavity, a crack and unidentifiable micro particles in the microscopic component, the effective substance is taken as an invalid point and is not counted; when the intersection point of the cross lines falls on the boundary of different components, selecting substances appearing in the quadrant without the boundary line as an identification object from the upper right quadrant in a clockwise sequence; the percentage contents of various microscopic components and minerals are expressed by the percentage of the statistical points of the microscopic components or minerals in the total effective points, and the numerical value is reserved to one position behind the decimal point; when counting one line, moving the optical sheet by one step along a fixed direction, namely a direction perpendicular to the previous step, at a preset line distance, and continuing counting the other line until the counting of the whole optical sheet is finished; the visual estimation method is suitable for common Hunan hydrocarbon source rocks, samples with organic matter content less than 2% of the micro-components are required to be observed on a whole slice, the micro-components are observed and identified by reflected white light and reflected fluorescence, no less than 50 visual fields are required to be observed, and the percentage of the areas of various micro-component points is estimated.
3) Cold soaking the whole rock slide in chloroform for 12 hours until most of amorphous organic matters in the mineral asphalt matrix are dissolved in chloroform;
4) repeating the step 2) on the soaked full rock slide;
5) calculating the percentage content of amorphous organic matter in the mineral asphalt matrix; the method comprises the following steps:
(5.1) differentiating the percentage content of the mineral asphalt matrix in the whole rock micro-components obtained in the step 2) and the step 4) by the following steps:
percent content of amorphous organic matter-mineral asphalt matrix before chloroform soaking-mineral asphalt matrix after chloroform soaking
(5.2) calculating the percentage content of amorphous organic matters in the mineral asphalt matrix before soaking, namely:
percent content of amorphous organic matter in mineral asphalt matrix/percent content of mineral asphalt matrix before chloroform soaking
Thus obtaining the percentage content of amorphous organic matters in the mineral asphalt matrix.
6) Calculating the percentage content of amorphous organic matters in the mineral asphalt matrix into a sapropel group, and calculating a type index TI value according to the relative percentage content of the sapropel group, the chitin group, the vitrinite group and the inert group; the type index TI value is calculated by adopting the following formula:
TI＝100×a+50×b－75×c－100×d
wherein a represents sapropel group, b represents chitin group, c represents vitrinite group, and d represents inert group.
7) And dividing the organic matter type of the hydrocarbon source rock according to the TI value. The organic matter types of the source rock are divided as follows:
TI: less than 10 standard humic type III2
TI: 10 to less than 20 sapropel-containing sapropel saprophyte type III1
TI: 20 to less than 50 rotten plants and decayed mud type II
TI: 50 to less than 80 humic-containing decayed mud type I2
TI: (80) humic sapropel type I1。
Taking the analysis result of the total rock microscopic component composition of 23 hydrocarbon source rock samples of a certain structure of a well a and a well B in the oil field of the Bohai sea as an example (see Table 2), if according to the traditional identification method, the mineral asphalt matrix in the sample is completely classified into the humus mud group, or the mineral asphalt matrix is completely removed from the humus mud group, so as to obtain the relative percentage content of four organic microscopic components, and the type index TI is calculated, the result is shown in Table 3, after the mineral asphalt matrix is classified into the humus mud group, the ratio of the humus mud group and the chitin group in the organic microscopic components is very high, as can be seen from FIG. 1, the organic matter type of the hydrocarbon source rock of the structure is of a mud-rotting type (I-type kerogen), which is obviously preferable to the results of the kerogen composition analysis and the pyrolysis analysis (FIG. 4a, FIG. 4B, FIG. 4c and FIG. 4d) of the hydrocarbon source rock. If the mineral asphalt matrix is removed from the sapropel group, the "vitrinite" in the organic microscopic component is absolutely dominant, and as can be seen from fig. 2, the organic matter type of the sample is saprophytic (i.e. type III kerogen), and the type deviation still does not accord with other analysis results (fig. 4a, fig. 4b, fig. 4c and fig. 4 d).
Aiming at the problem, the method for judging the organic matter type of the hydrocarbon source rock comprises the following specific steps:
(1) firstly, 14 hydrocarbon source rock samples with high mineral asphalt matrix content in two wells of a certain structure A, B in the Bohai sea oil field are classified, identified and counted by referring to the content execution of the petroleum and natural gas industry standard SY/T6414-2014 & Total rock slide micro-component identification and counting method. The classification and identification subjects are shown in table 1. The statistical process can adopt a point counting method or a visual estimation method to carry out volume fraction, and original records are filled according to the statistical result, and the result is shown in table 2.
TABLE 1 complete rock micro-component classification chart
TABLE 2 analysis of the whole rock micro-composition of the source rock sample in the northwest of the temple
Note: inorganic, organic, mirror, inert, crust, humus, mineral respectively denote the relative percentages (%) -of inorganic mineral, total organic micro-constituent (comprising mineral asphalt matrix), vitrinite, inert constituent, crust constituent, humus constituent (comprising mineral asphalt matrix), mineral asphalt matrix
(2) Soaking the whole rock slice in chloroform for 12 hours, wherein most of amorphous organic matters in a sample mineral asphalt mechanism are dissolved in chloroform;
(3) and (3) repeating the step (1), and performing classification, identification and statistics of the microscopic components under the second microscope (counting the contents of the mineral asphalt matrix and the amorphous organic matter) by referring to the content execution of the standard SY/T6414-. The classification and identification subjects are shown in table 1. The statistical process can adopt a point counting method and a visual estimation method to carry out volume fraction, and original records are filled according to the statistical result, and the result is shown in a table 3.
TABLE 3 organic micro-component composition of Miao Zhangbei hollow hydrocarbon source rock sample
Note: the mirror, the inert, the shell and the rotten respectively represent the relative percentage contents (%) of the vitrinite group, the inert group, the chitin group and the rotten mud group; TI: type index.
(4) Since the amorphous organic matter corresponds to the organic matter contained in the source rock mineral bitumen matrix, more than 80% of the amorphous organic matter is dissolved after soaking with chloroform, and the rest is mainly inorganic minerals. Therefore, the content of amorphous organic matter can be obtained only by comparing the content change of mineral asphalt matrix in the composition analysis of the whole rock micro-components of the sample twice before and after the soaking in chloroform, as shown in table 3:
c (amorphous organic matter percentage) a (mineral asphalt matrix percentage before chloroform soaking) -b (mineral asphalt mechanism percentage after chloroform soaking)
The content of the mineral asphalt matrix before chloroform soaking is 0.8-16.2% (column a in table 4), the content is reduced to 0.6-13.6% (column b in table 4) after soaking, the difference value of the two is the content of amorphous organic matters, which accounts for 0.2-2.6% (column c in table 4) of the whole rock volume, and further, the content of the organic matters in the original mineral asphalt matrix (before soaking) can be obtained:
d (percentage of amorphous organic matter in mineral asphalt matrix) c (percentage of amorphous organic matter)/a (percentage of mineral asphalt matrix before chloroform soaking)
The calculation result shows that the content of organic matters in the original mineral asphalt matrix is 15.9-27.1% (shown in the column d in the table 3), and the average value is 19.2%;
TABLE 4 analysis of the composition of the micro-components before and after chloroform immersion
Note: a. b-the percentage content (%) of the mineral asphalt matrix in the whole rock before and after soaking respectively; c-percentage of the amorphous body to the whole rock (%); d-amorphous organic matter content (%) in mineral asphalt matrix; e-h are the relative percentage content (%), of vitrinite group, inert group, chitin group and sapropel group respectively
(5) Counting amorphous organic matters of the mineral asphalt matrix into the sapropel group, counting the relative percentage contents of the vitrinite group, the inert group, the chitin group and the sapropel group (listed in tables 4 e-h), and calculating a TI (type index) value:
TI 100xh (sapropel group) +50xg (chitin group) -75xe (vitrinite group) -100xf (inert group)
The calculation results are shown in a table 3TI column, the TI values of the Dong-two upper sub-section hydrocarbon source rocks of the well A and the well B are distributed in an interval of less than 0 and 0-40, the TI values of the Dong-two lower sub-section E-sand first-section rock sample are mainly distributed in 40-80, and the TI values of a few samples are 0-40, which is shown in a table 4.
(6) According to the improvementThe subsequent test method is to count each organic microscopic component in the sample again, and calculate the TI (type index) value, and then the organic matter type of the hydrocarbon source rock in the upper two sub-sections of the A well and the B well is II as shown in the table 4 and the figure 52Type III to type III; the organic matter type of the hydrocarbon source rock of E1Type, in part, is II2And (4) molding. The results of this division are essentially consistent with the organic matter type assessed by elemental analysis of kerogen, analysis of rock pyrolysis (see figure 4).
TABLE 5 complete rock micro-component classification chart
Claims (7)
1. A method for judging the organic matter type of a hydrocarbon source rock is characterized by comprising the following steps:
1) preparing a whole rock slide sample of the source rock, and comprises the steps of pretreatment and preparation of the sample, inlaying and polishing;
2) classifying, identifying and counting microscopic components of the sample under a microscope;
3) cold soaking the whole rock slide in chloroform for 12 hours;
4) repeating the step 2) on the soaked full rock slide;
5) calculating the percentage content of amorphous organic matter in the mineral asphalt matrix;
6) calculating the percentage content of amorphous organic matters in the mineral asphalt matrix into a sapropel group, and calculating a type index TI value according to the relative percentage content of the sapropel group, the chitin group, the vitrinite group and the inert group;
7) and dividing the organic matter type of the hydrocarbon source rock according to the TI value.
2. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein the step 1) comprises the following steps:
(1.1) taking not less than 10g of a sample to be analyzed, crushing the rock sample by using a copper mortar to obtain a rock sample with the particle size of 0.5-1 mm, and taking at least 5g of the rock sample to be prepared into a reflecting light sheet;
(1.2) mixing the prepared sample with organic glass powder according to the volume ratio of 3:2, putting the mixture into a mosaic machine, slowly adding 15ml of organic glass powder, and finally putting a label into the mosaic machine;
(1.3) setting the working conditions of the thermal inlaying machine as follows: inlaying the transparent material, heating at 120 ℃ for 15min, pressurizing to 310bar, cooling for 7min, starting a working button, and taking out the polished section after the inlaying machine finishes inlaying and sounds a reminder;
(1.4) placing the inlaid polished section in a fixture of a Puruis automatic polishing machine for polishing, and setting programs and conditions of all polishing procedures on a touch screen after the Puruis automatic polishing machine needs to be started up:
a) the pre-polishing piece of the P600 waterproof abrasive paper is a plane, the rotating speed is adjusted to be 100r/min, the pre-polishing time is 1min, and the water spraying mode is kept on;
b) the method comprises the following steps of (1) roughly polishing a P1200 waterproof abrasive paper sheet, adjusting the rotating speed to 150r/min, keeping the rough grinding time for 3min, and keeping the water spraying mode on;
c) p3600 fine polishing sheet of water sand paper, adjusting the rotating speed to 200r/min, keeping the fine polishing time for 3min, and keeping the water spraying mode to be started;
d) roughly polishing for 3min by using polishing solution of 3 mu, adjusting the rotating speed to 200r/min and keeping the water spraying mode closed;
e) fine polishing for 3min by using polishing solution of 1 mu, adjusting the rotating speed to be 100r/min and keeping the water spraying mode closed;
f) cleaning the polished section by using an ultrasonic cleaner;
g) and (3) observing under a dry objective, wherein the polished surface of the polished section has no stain, no needle-shaped scratch, no cloth mark, clear component boundary and no scribing and grinding point, placing the polished section in a dryer for standing for 12h after the polished section is qualified, and finishing the preparation of the sample.
3. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein in the step 2): the identification process is executed according to the content of the oil and gas industry standard SY/T6414-2014 & lt & ltwhole rock light sheet micro-composition identification and statistical method & gt & lt; observing the microscopic components according to the characteristics of the microscope under oil immersion reflected light and fluorescence characteristics; the classification and naming of the micro-components are based on the micro-components of coal and a classification method according to the organic matter of the continental facies or the marine facies hydrocarbon source rock in China; the microscopic components in the hydrocarbon source rock are characterized in that the wavelength of a fluorescence excitation light source is 410-530 nm, and the reflected white light refers to oil-immersed reflected light.
4. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein the step 2) specifically comprises the following steps:
(2.1) placing the flattened polished section on an objective table, dripping immersion oil, focusing by a microscope, and correcting the center of an objective lens;
(2.2) adjusting the aperture and the aperture field and the aperture size to ensure that the light rays in the field are uniform and the image is clear;
(2.3) identifying and distinguishing by alternately observing oil-immersed reflected light and reflected fluorescence during observation, wherein the observation object comprises: the volume fraction is carried out by adopting a point counting method or an eye estimation method in the statistical process, and the original record is filled according to the statistical result; wherein the content of the first and second substances,
the point counting method is used for coal and carbonaceous mudstone samples, and firstly, the moving step pitch of an object stage is determined to be 0.4-0.6 mm; more than 600 effective measuring points are guaranteed to be uniformly distributed on the whole plate; fixing an object stage, identifying which type of microscopic component or mineral the effective substance located under the intersection point of the cross line of the ocular from one end of the sample, recording the effective substance into a corresponding counting key or statistical software, then gradually moving along a fixed direction according to a set step length, and taking the intersection point as an invalid point when the intersection point of the cross line falls on the cement, the cell cavity, the crack and unidentifiable tiny particles in the microscopic component, and not counting; when the intersection point of the cross lines falls on the boundary of different components, selecting substances appearing in the quadrant without the boundary line as an identification object from the upper right quadrant in a clockwise sequence; the percentage contents of various microscopic components and minerals are expressed by the percentage of the statistical points of the microscopic components or minerals in the total effective points, and the numerical value is reserved to one position behind the decimal point; when counting one line, moving the optical sheet by one step along a fixed direction, namely a direction perpendicular to the previous step, at a preset line distance, and continuing counting the other line until the counting of the whole optical sheet is finished; the visual estimation method is suitable for common Hunan hydrocarbon source rocks, samples with organic matter content less than 2% of the micro-components are required to be observed on a whole slice, the micro-components are observed and identified by reflected white light and reflected fluorescence, no less than 50 visual fields are required to be observed, and the percentage of the areas of various micro-component points is estimated.
5. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein the step 5) comprises the following steps:
(5.1) differentiating the percentage content of the mineral asphalt matrix in the whole rock micro-components obtained in the step 2) and the step 4) by the following steps:
percent content of amorphous organic matter-mineral asphalt matrix before chloroform soaking-mineral asphalt matrix after chloroform soaking
(5.2) calculating the percentage content of amorphous organic matters in the mineral asphalt matrix before soaking, namely:
percent content of amorphous organic matter in mineral asphalt matrix/percent content of mineral asphalt matrix before chloroform soaking
Thus obtaining the percentage content of amorphous organic matters in the mineral asphalt matrix.
6. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein in the step 6), the type index TI value is calculated by adopting the following formula:
TI＝100×a+50×b－75×c－100×d
wherein a represents sapropel group, b represents chitin group, c represents vitrinite group, and d represents inert group.
7. The method for determining the organic matter type of the hydrocarbon source rock according to claim 1, wherein the organic matter type of the hydrocarbon source rock in the step 7) is divided as follows:
TI: less than 10 standard humic type III2
TI: 10 to less than 20 sapropel-containing sapropel saprophyte type III1
TI: 20 to less than 50 rotten plants and rotten mud type II TI: 50 to less than 80 humic-containing decayed mud type I2TI: (80) humic sapropel type I1。
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| US20200264152A1 (en) * | 2019-02-20 | 2020-08-20 | Saudi Arabian Oil Company | Automated organic petrology |
| CN111830034A (en) * | 2020-06-09 | 2020-10-27 | 谢小敏 | Analysis and statistics method for organic matter microscopic biological composition in hydrocarbon source rock |
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| US20200264152A1 (en) * | 2019-02-20 | 2020-08-20 | Saudi Arabian Oil Company | Automated organic petrology |
| CN111830034A (en) * | 2020-06-09 | 2020-10-27 | 谢小敏 | Analysis and statistics method for organic matter microscopic biological composition in hydrocarbon source rock |
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