CN112485239A - Ancient fluid comprehensive analysis method related to oil and gas reservoir - Google Patents
Ancient fluid comprehensive analysis method related to oil and gas reservoir Download PDFInfo
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Abstract
The invention belongs to the field of oil-gas exploration research, and particularly provides an ancient fluid comprehensive analysis method related to oil-gas reservoir formation. The method of the invention takes the hydrocarbon-containing calcite related to oil and gas reservoirs as a research object, can determine the activity age and the hydrocarbon-containing components of the hydrocarbon-containing fluid, can find out the temperature and the source of the hydrocarbon-containing fluid, and can effectively solve the problems of age information loss, single tracing method, strong explanation subjectivity and the like in the prior art.
Description
Technical Field
The invention relates to the field of oil and gas exploration research, in particular to an ancient fluid comprehensive analysis method related to oil and gas reservoir formation.
Background
Basin fluids are the most active geological efforts of hydrocarbon-bearing basins and participate in almost all geological processes of sedimentary basins, such as hydrocarbon reservoir formation, diagenesis, reservoir reformation and the like. The fluid activity leads the source rock to mature and generate hydrocarbon, changes the performance of the reservoir and carries oil and gas to move to a proper position to form a reservoir. Therefore, the comprehensive research on the ancient fluid of the hydrocarbon-bearing basin, the determination of the basin source and the temperature and the finding of the activity age of the fluid of the basin are important for disclosing the diagenetic and reservoir process of the basin and the oil-gas enrichment rule.
Basin fluids can be divided into two broad categories, hydrocarbon-containing fluids and hydrocarbon-free fluids, wherein the hydrocarbon-containing fluids are closely related to hydrocarbon reservoirs during the migration from the source rock to the trap. The activity of hydrocarbon-containing fluids is the most important link in the formation of hydrocarbons compared to hydrocarbon-free fluids, the age of which represents the age of the hydrocarbon reservoir. Geochemical research on the product calcite of the hydrocarbon-containing fluid can trace the source, the temperature and the evolution process of the hydrocarbon-containing fluid. Therefore, the comprehensive analysis is developed aiming at hydrocarbon-containing fluid related to oil and gas reservoirs, and the comprehensive analysis is very important for revealing oil and gas enrichment mechanisms and guiding oil and gas exploration.
During the migration of hydrocarbon-containing fluids from the source rock to the trap, calcite veins, which are the direct product of hydrocarbon reservoir formation, are formed in the microfractures, fractures and reservoir pores as the temperature and pressure conditions change. Calcite vein formed by hydrocarbon-containing fluids may be better used for tracing fluid activity than basin fluid indirect products such as clay minerals. The age of oil and gas formation can be determined by the research of the development of the chronology of calcite vein formed by hydrocarbon-containing fluid. However, since the content of radioisotopes in calcite is low, e.g. the average content of U and Pb is below 0.2ppm, the dating of calcite is extremely challenging. In recent years, experimenters have successfully developed a laser in-situ calcite U-Pb dating technology, the calcite formation age can be accurately determined, and the oil and gas storage age can be determined through research on the development age of the hydrocarbon-containing calcite. In addition, calcite cement is sensitive to medium environment reactions, for which isotopic geochemistry and trace element research are developed as important means for tracing fluid sources, temperatures and evolution processes. For example, calcite oxygen isotope is highly temperature sensitive for fractionation and is one of the most commonly used geological thermometers, and oxygen isotope analysis can provide fluid temperature information. The type of diagenetic fluid can be further judged through a mutual projection diagram of carbon and oxygen isotope components, and the source of the fluid is determined. In addition, the strontium isotopes in calcite have distinct advantages in tracing the source of the fluid, since fluids from different sources tend to have different strontium isotope compositions. The shell source strontium isotope has an average value of 0.7119 and the mantle source strontium isotope has an average value of 0.7035, thus87Sr/86The Sr ratio is a scale reflecting the signature characteristics of the different source materials.
In conclusion, in the field of oil and gas exploration, the research aiming at basin fluids mainly takes geochemical tracing as a main part, and has the defects of single tracing method, strong explanation subjectivity, insufficient reliability of obtained results and the like. More seriously, the lack of fluid dating technology, which is essential to the prior art, clearly greatly limits the geologist's knowledge of the fluid activity history. In addition, the prior art has few researches on ancient fluids related to hydrocarbon reservoirs, and lacks a targeted comprehensive research method, and researches on such fluid products are more important for guiding hydrocarbon exploration.
Disclosure of Invention
In view of the above, the invention provides an ancient fluid comprehensive analysis method related to oil and gas reservoirs, which takes hydrocarbon-containing calcite related to oil and gas reservoirs as a research object, can determine the activity age and hydrocarbon-containing components of hydrocarbon-containing fluid, can find out the temperature and source of the hydrocarbon-containing fluid, and can effectively solve the problems of age information loss, single tracing method, strong explanation subjectivity and the like in the prior art.
The invention provides an ancient fluid comprehensive analysis method related to oil and gas reservoirs, which comprises the following steps:
step S1, collecting and screening calcite samples: collecting a calcite vein sample, wherein in the sampling process, the section of the collected sample is ensured to be fresh and not to be influenced by the later-stage alteration or deterioration; calcite is inserted into the surrounding rock in a vein body form, attention needs to be paid to distinguishing calcite veins and quartz veins in the sampling process, the hardness of the quartz veins is higher, and the quartz veins are not used as research objects because the U content is very low;
step S2, cathodoluminescence analysis: preparing calcite vein sample slices by using the collected calcite vein samples, performing mineralogical observation by using a polarizing microscope, and periodically dividing the litholytic vein samples according to the cathodoluminescence color of the calcite vein sample slices under the polarizing microscope;
step S3, hydrocarbon-containing fluid inclusion identification: preparing a fluid inclusion slice by using the collected calcite vein sample, identifying hydrocarbon-containing fluid inclusions under a fluorescence microscope, identifying single-stage calcite containing the hydrocarbon-containing fluid inclusions according to the stage division result of the litholytic vein sample in the step S2, and performing classification description on the hydrocarbon-containing fluid inclusions in the calcite veins of different stages according to the stages to describe the characteristics and the differences of the stages;
step S4, measuring the uniform temperature of the fluid enclosure: carrying out uniform temperature measurement on each hydrocarbon-containing fluid inclusion by using a LinkamTH600 cold-hot table, obtaining uniform temperatures of a plurality of hydrocarbon-containing fluid inclusions, establishing a uniform temperature histogram, and determining a uniform temperature average value of calcite veins according to the uniform temperature histogram, wherein the uniform temperature average value represents the formation temperature of the hydrocarbon-containing fluid inclusions;
step S5, laser raman analysis of fluid inclusions: according to the hydrocarbon-containing fluid inclusion identified in the step S3, performing laser in-situ analysis on the hydrocarbon-containing fluid inclusion developing in the lithotomy by using laser Raman to determine the composition of the hydrocarbon-containing fluid in the hydrocarbon-containing fluid inclusion; the main peak displacement of the hydrocarbon-containing fluid component is related to the temperature and the pressure of the fluid inclusion, and the laser Raman spectrogram identification characteristic of the hydrocarbon-containing fluid inclusion comprises: CH (CH)4At 2913cm-1A shift of a main peak, C, develops nearby2H6At 2961cm-1A main peak shift develops nearby, and the liquid hydrocarbon is 1601cm-1Near development of a major peak shift, n-heptane (containing mainly CH)3、CH2) The main peak displacement of the light source is 2800-3000 cm-1；
Step S6, laser in-situ calcite vein U-Pb dating: carrying out laser in-situ U-Pb dating analysis on single-stage quadratic litholysis veins of a developing hydrocarbon-containing fluid inclusion (note that calcite products of different stages cannot be mixed together), obtaining the stage of hydrothermal activity, and determining the formation stage of the calcite veins; the laser target is manufactured by the processes of sample cutting, glue pouring, target making, polishing, target loading and the like, the content of U and Pb elements in authigenic carbonate minerals is low, the autogenigenic carbonate minerals need to be kept clean in the early-stage treatment, the target surface needs to be cleaned systematically before testing, the target surface is naturally dried in a fume hood of an ultra-clean laboratory after cleaning, and the later-stage testing needs to be finished in the ultra-clean laboratory;
step S7, C-O isotope analysis of calcite and surrounding rock: drilling a single-stage cubic litholysis vein sample and an adjacent surrounding rock sample of the hydrocarbon-containing fluid inclusion in the step S6 by using a micro drill, grinding the samples into powder smaller than 200 meshes, weighing calcite and surrounding rock samples of about 10mg, and performing carbon and oxygen isotope analysis;
step S8, calcite and surrounding rock Sr isotope analysis: using a micro drill to drill a single-stage cubic litholysis vein sample and an adjacent surrounding rock sample of the hydrocarbon-containing fluid inclusion in the step S6, weighing 20mg of calcite and the surrounding rock sample, and performing strontium isotope analysis;
step S9, determining the temperature and source of the hydrocarbon-containing fluid: the temperature and the source of the hydrocarbon-containing fluid are determined based on the results of the carbon and oxygen isotope analysis of step S7 and the results of the strontium isotope analysis of step S8.
Further, in step S1, the calcite sample is derived from a clastic or carbonate reservoir in which the developing calcite veins enriched for hydrocarbon-containing fluid inclusions tend to be the product of hydrocarbon-containing fluid precipitation.
Further, in step S2, the calcite vein sample was double-side polished to a thickness of 0.05mm to produce a calcite vein sample sheet.
Further, in step S2, when the cathodoluminescence color of the calcite vein sample sheet under the polarization microscope is red to dark red, the calcite vein sample is early-formed calcite; when the cathodoluminescence color of the calcite vein sample slice is bright red to orange red under a polarizing microscope, the calcite vein sample is calcite formed at a later stage; the cathodoluminescence of carbonate minerals is mainly controlled by Fe in crystal lattices2+、Mn2+According to the mass fraction of Mn in the calcite vein2+/Fe2+The pulse bodies show different intensities of cathode light and early formed calcite Mn under a polarizing microscope according to different ratios2+/Fe2+Lower ratio (Mn)2+/Fe2+The ratio is less than 1), the cathodoluminescence is red to dark red; and calcite Mn formed at a late stage2+/Fe2+The ratio is relatively large (Mn)2+/Fe2+The ratio is more than 1), and the cathodoluminescence is bright red to orange red.
Further, in step S3, polishing both sides of the calcite vein sample to a thickness of 0.1mm to obtain a fluid inclusion sheet, observing the luminescence of the fluid inclusion under a fluorescence microscope, distinguishing the hydrocarbon-containing fluid inclusion from the hydrocarbon-free fluid inclusion, wherein the hydrocarbon-containing fluid inclusion fluoresces yellow, yellow-green or blue-white under the microscope, and is often yellowish brown or yellow in transmitted light, and is generally isolated, indicating hydrocarbon discharge or oil gas filling during the formation of calcite; hydrocarbon fluid free inclusions do not fluoresce and are colorless in transmitted light.
Further, in step S4, the homogeneous temperature measurement and salinity measurement of the hydrocarbon-containing fluid inclusion are performed on a LinkamTH600 cold-hot stage; the temperature rise rate at the beginning of the uniform temperature measurement is 15 ℃/min, when the temperature is close to uniform, the temperature rise rate is reduced to 1 ℃/min, and the uniform temperature measurement precision is +/-1 ℃.
Further, in step S5, the laser raman analysis device is a Renishaw inviia type laser raman spectrometer (Renishaw corporation, uk) using Ar+Laser with wavelength of 514nm and spectral resolution of 2cm-1。
Further, in step S6, in the laser test process, the spot size is usually 50-100 microns, 30-80 calcite pulse samples per period of the test laser spot are obtained, and the test data includes238U/206Pb、207Pb/206Pb, U, Pb, etc.
Further, in step S7, carbon and oxygen isotope analysis was performed on a Mat 253 mass spectrometer using 100% orthophosphoric acid.
Further, in step S8, multiple reception or the like is usedStrontium isotope determination by plasma Mass Spectrometry (MC-ICP-MS)87Sr/86Sr value according to87Sr/86Sr 0.1194 mass fractionation criteria.
The method provided by the invention utilizes a fluid inclusion analysis technology to identify calcite vein bodies related to oil and gas reservoir, further utilizes an inclusion laser Raman technology to find out hydrocarbon components, utilizes a laser in-situ calcite dating technology to determine the calcite formation age (namely the oil and gas reservoir age), and combines with calcite C-O-Sr isotope analysis to determine the temperature and the source of the hydrocarbon-containing fluid. Thus, the method provided by the invention can determine not only the age of the oil and gas reservoir, but also the source and temperature of the hydrocarbon-containing fluid.
The technical scheme provided by the invention has the following advantages: (1) the method provided by the invention combines the laser Raman technology and the laser in-situ calcite U-Pb dating technology, both the two technologies adopt the micro-area in-situ analysis technology, the pretreatment is simple, the test period is short, the spatial resolution of the laser in-situ technology is about 100 microns, the spatial resolution is high, and the method can be used for analyzing the multi-stage fluid activity product development system; (2) the method provided by the invention aims at the research of the isotope chronology and the geochemistry of the hydrocarbon-containing fluid deployment system, and can simultaneously determine the activity age, the source and the temperature of the hydrocarbon-containing fluid.
Drawings
FIG. 1 is a schematic flow diagram of an ancient fluid analysis method associated with hydrocarbon reservoirs in accordance with the present invention.
Fig. 2 is a cathodoluminescence image of calcite veins according to example 1 of the present invention.
Figure 3 is an identification of hydrocarbon inclusion in calcite vein of example 1 of the present invention.
Figure 4 is a graph of the uniform temperature profile of hydrocarbon inclusion bodies in the calcite vein of example 1 of the present invention.
FIG. 5 shows the analysis of the components of the calcite vein by laser Raman spectroscopy of hydrocarbon inclusion in the calcite vein according to example 1 of the present invention.
Fig. 6 is a laser in situ U-Pb dating result of hydrocarbon-containing calcite veins of example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings and examples.
Example 1:
referring to fig. 1, embodiment 1 of the present invention provides a method for comprehensively analyzing an ancient fluid associated with a hydrocarbon reservoir, including the steps of:
step S1, collecting and screening calcite samples: 1 calcite vein sample is collected from the ancient city area of the Tarim basin, and calcite is produced in a carbonate reservoir in a vein shape and is a later-stage fluid activity product.
Step S2, cathodoluminescence analysis: polishing the two sides of the collected calcite vein sample to be 0.05mm thick, manufacturing a calcite vein sample slice, performing mineralogical observation by using a Leica DM4500P polarizing microscope, and observing that the calcite vein is red to dark red under the polarizing microscope through cathodoluminescence analysis of the calcite vein sample, wherein the calcite vein sample is indicated to be a single-stage ancient fluid filling product; the cathodoluminescence image of the calcite pulse is shown in figure 2.
Step S3, hydrocarbon-containing fluid inclusion identification: the collected calcite vein samples were polished on both sides to a thickness of 0.1mm to prepare fluid inclusion sheets, and the fluid inclusions were observed by a fluorescence microscope to be yellow, yellowish green or bluish white in fluorescence color and to appear yellowish brown or yellow in transmitted light (see fig. 3), indicating that the calcite was filled with hydrocarbons during the formation and that a large number of hydrocarbon-containing fluid inclusions were present.
Step S4, measuring the uniform temperature of the fluid enclosure: using hydrocarbon-containing fluid inclusion as research object, carrying out uniform temperature measurement on each hydrocarbon-containing fluid inclusion on LinkamTH600 cold-hot table, wherein the initial heating rate of the uniform temperature measurement is 15 ℃/min, the heating rate is reduced to 1 ℃/min when the temperature is close to uniform, and the uniform temperature measurement precision is +/-1 ℃. Based on the measured uniform temperature values of the 18 hydrocarbon-containing fluid inclusions, a uniform temperature histogram (see fig. 4) was created, which showed a major temperature distribution range of the inclusions of calcite veins ranging from 120 ℃ to 140 ℃, and the average uniform temperature of the hydrocarbon-containing calcite veins at this stage was determined to be 132 ℃.
Step S5, laser raman analysis of fluid inclusions: and (4) according to the hydrocarbon-containing fluid inclusion identified in the step S3, performing laser in-situ analysis on the hydrocarbon-containing fluid inclusion developing in the lithotomy by using laser Raman to determine the composition of the hydrocarbon-containing fluid in the hydrocarbon-containing fluid inclusion. The laser Raman analyzer was a Renisshaw Invia type laser Raman spectrometer (Renisshaw, UK) using Ar+Laser with wavelength of 514nm and spectral resolution of 2cm-1. Raman spectroscopy (see FIG. 5) showed that the fluid inclusions were 2913cm-1、2961cm-1、1601cm-1Shift of the major peak of homoeogenesis, respectively representing CH4、C2H6And a liquid hydrocarbon, indicating that the inclusion is a gaseous liquid hydrocarbon coexisting fluid inclusion.
Step S6, laser in-situ calcite vein U-Pb dating: and performing laser in-situ laser calcite U-Pb fixed-year test on the hydrocarbon-containing calcite pulse by using a laser-induced multi-receiving cup inductively coupled plasma mass spectrometer, wherein the laser energy is 3J/cm < -2 >, the single-laser-point test time is 48s, and the laser ablation time is 25 s. After the data are processed by Iolite software, Isoplot software is used for calculating that the age of the hydrothermal activity in the period is 97.8 +/-0.9 Ma (MSWD is 0.6) (see figure 6), and then the age of the ancient fluid activity is accurately determined, wherein the age also represents the age of the first-period oil-gas reservoir event.
Step S7, C-O isotope analysis of calcite and surrounding rock: the single-stage cubic vein-breaking sample and the surrounding rock (limestone) sample of the hydrocarbon-containing fluid inclusion in step S6 were drilled using a micro drill, ground into powders smaller than 200 mesh, about 10mg of calcite and limestone samples were weighed, and subjected to carbon and oxygen isotope analysis on a Mat 253 mass spectrometer using 100% orthophosphoric acid.
Step S8, calcite and surrounding rock Sr isotope analysis: using a micro drill to drill the single-stage cubic litholytic vein sample and the adjacent surrounding rock sample of the hydrocarbon-containing fluid inclusion in the step S6, weighing 20mg calcite and surrounding rock limestone samples, performing strontium isotope analysis on a multi-receiving plasma mass spectrometer (MC-ICP-MS), and measuring87Sr/86Sr value according to87Sr/86Sr 0.1194 mass fractionation criteria.
Step S9, determining the temperature and source of the hydrocarbon-containing fluid: delta of calcite vein13C value is-1.2 ‰, delta18O value is-10 per mill; while the surrounding rock delta13C value is-0.5 ‰, delta18The O value is-2.1 per mill. Calcite vein vs. surrounding rock, delta18The O is significantly lower, reflecting the higher temperature of the fluid, which is consistent with the conclusion of uniform temperature of the fluid inclusions. And delta13The C value is characterised as being more negative than that of the surrounding rock, possibly indicating the presence of a certain amount of carbon of organic origin, on the basis of the inorganic carbon provided by dissolution of the limestone, indicating the presence of incorporation of hydrocarbon-containing components.
Of calcite veins87Sr/86Sr value of 0.70964 in the surrounding rock87Sr/86The Sr value is 0.70871, the strontium isotope value is obviously higher than that of the surrounding rock, which shows87Sr originates mainly from hydrocarbon-forming fluids.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An ancient fluid comprehensive analysis method related to oil and gas reservoirs is characterized by comprising the following steps:
s1, collecting and screening calcite samples: collecting a calcite vein sample, wherein in the sampling process, the section of the collected sample is ensured to be fresh and not to be influenced by the later-stage alteration or deterioration;
s2, cathodoluminescence analysis: preparing calcite vein sample slices by using the collected calcite vein samples, performing mineralogical observation by using a polarizing microscope, and periodically dividing the litholytic vein samples according to the cathodoluminescence color of the calcite vein sample slices under the polarizing microscope;
s3, hydrocarbon-containing fluid inclusion identification: preparing a fluid inclusion slice by using the collected calcite vein sample, identifying hydrocarbon-containing fluid inclusions under a fluorescence microscope, and identifying single-stage cubic litholysis vein containing the hydrocarbon-containing fluid inclusions according to stage division results of the litholysis vein sample in the step S2;
s4, measuring the uniform temperature of the fluid inclusion: according to the single-stage cubic lithotriptic vein containing the hydrocarbon-containing fluid inclusion identified in the step S3, performing uniform temperature measurement on each hydrocarbon-containing fluid inclusion to obtain a uniform temperature average value of the calcite vein;
s5, laser raman analysis of fluid inclusions: according to the hydrocarbon-containing fluid inclusion identified in the step S3, performing laser in-situ analysis on the hydrocarbon-containing fluid inclusion developing in the lithotomy by using laser Raman to determine the composition of the hydrocarbon-containing fluid in the hydrocarbon-containing fluid inclusion;
s6, laser in-situ calcite vein U-Pb dating: carrying out laser in-situ U-Pb dating analysis on single-stage quadratic litholysis veins developing hydrocarbon-containing fluid inclusion to determine the formation age of calcite veins;
s7, C-O isotope analysis of calcite and surrounding rock: drilling a single-stage cubic litholysis vein sample and an adjacent surrounding rock sample of the hydrocarbon-containing fluid inclusion in the step S6 by using a micro drill, grinding the samples into powder smaller than 200 meshes, weighing calcite and the surrounding rock sample, and performing carbon and oxygen isotope analysis;
s8, calcite and surrounding rock Sr isotope analysis: using a micro drill to drill a single-stage cubic litholysis vein sample and an adjacent surrounding rock sample of the hydrocarbon-containing fluid inclusion in the step S6, weighing calcite and the surrounding rock sample, and performing strontium isotope analysis;
s9, determining the temperature and source of the hydrocarbon-containing fluid: the temperature and the source of the hydrocarbon-containing fluid are determined based on the results of the carbon and oxygen isotope analysis of step S7 and the results of the strontium isotope analysis of step S8.
2. The integrated ancient fluid analysis method for hydrocarbon reservoirs according to claim 1, wherein in step S1, the calcite sample is derived from clastic or carbonate reservoirs.
3. The method for comprehensive analysis of ancient fluids related to hydrocarbon reservoirs according to claim 1, wherein in step S2, the calcite vein sample is double-side polished to 0.05mm thickness to obtain calcite vein sample slices.
4. The method for comprehensively analyzing ancient fluids related to oil and gas reservoirs according to claim 1, wherein in step S2, when the cathodoluminescence color of the calcite vein sample sheet is red to dark red under a polarization microscope, the calcite vein sample is early-formed calcite; the calcite vein sample slice is bright red to orange red in cathodoluminescence color under a polarization microscope, and the calcite vein sample is calcite formed at a later stage.
5. The method for integrated ancient fluid analysis related to hydrocarbon reservoirs according to claim 1, wherein in step S3, the calcite vein sample is polished to 0.1mm thickness on both sides to obtain a thin sheet of fluid inclusions, and hydrocarbon-containing fluid inclusions are identified under a fluorescence microscope.
6. The method for integrated ancient fluid analysis related to hydrocarbon reservoirs according to claim 1, wherein in step S4, the process of determining the homogeneous temperature of hydrocarbon-containing fluid inclusion is specifically as follows: the method comprises the steps of performing uniform temperature measurement on each hydrocarbon-containing fluid inclusion by using a LinkamTH600 cold-hot table, obtaining uniform temperatures of a plurality of hydrocarbon-containing fluid inclusions, establishing a uniform temperature histogram, and determining a uniform temperature average value of calcite veins according to the uniform temperature histogram, wherein the uniform temperature average value represents the formation temperature of the hydrocarbon-containing fluid inclusions.
7. The method of claim 1, wherein in step S5, the laser raman analyzer is used as a tool for ancient fluid analysis in connection with hydrocarbon reservoirsFor Renishaw Invia type laser Raman spectrometer, Ar was used+Laser with wavelength of 514nm and spectral resolution of 2cm-1。
8. The method for comprehensively analyzing ancient fluids related to oil and gas reservoirs according to claim 1, wherein in the step S6, the light spot size is 50-100 microns during the laser test, and 30-80 laser spots are tested on each calcite pulse sample.
9. The method of claim 1, wherein the step S7 is performed by using a Mat 253 mass spectrometer for carbon and oxygen isotope analysis.
10. The method for integrated ancient fluid analysis related to hydrocarbon reservoirs according to claim 1, wherein in step S8, strontium isotope determination is performed using a multiple-receiver plasma mass spectrometer.
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| CN117420167A (en) * | 2023-12-14 | 2024-01-19 | 北京大学 | Method for measuring years of deep land shale natural crack calcite filling |
| CN117420167B (en) * | 2023-12-14 | 2024-03-05 | 北京大学 | Method for measuring years of deep land shale natural crack calcite filling |
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