Method, device and equipment for determining multi-stage crude oil filling time of superimposed basin

Abstract

The invention discloses a method, a device and equipment for determining the multi-stage crude oil filling time of a superimposed basin, and the method comprises the steps: carrying out the preliminary division of the crude oil filling periods of the superimposed basin based on the physical property parameters of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin; based on the burial depth and thickness of the current stratum, the burial type of the superimposed basin is recovered in a mechanical compaction correction mode; projecting the uniform temperatures of the saline water inclusions in different charging periods to a superimposed basin burial history by using a fluid inclusion method so as to obtain the possible time of crude oil charging in different charging periods; and determining the U-Pb geological age of the diagenetic mineral corresponding to the charging period in the rock slice sample based on a U-Pb dating test result of the diagenetic mineral corresponding to the charging period comprising at least two possible times of crude oil charging. And correcting the possible time of crude oil filling based on the U-Pb geological age of the diagenetic minerals and determining the multi-stage crude oil filling time of the superimposed basin.

Description

Technical Field

[0001] This invention relates to the field of petroleum geological exploration technology, and in particular to a method, apparatus and equipment for determining the timing of multi-stage crude oil charging in superimposed basins. Background Technology

[0002] Superimposed basins are basins formed by the superposition of two or more proto-basins. These basins typically possess multiple sets of source rocks and undergo multiple phases of crude oil charging. Due to their characteristic of multi-phase tectonic alteration, accurately determining the timing of these multiple crude oil charging phases within superimposed basins is particularly difficult. Currently, fluid inclusion methods, authigenic illite K-Ar (Ar-Ar) dating, authigenic potassium feldspar plus rim Ar-Ar dating, and U-Pb, Pb-Pb, Rb-Sr, Sm-Nd, and Re-Os isotope dating of bitumen, kerogen, and crude oil are commonly used semi-quantitative or quantitative methods for determining crude oil charging time. However, the application of these methods in superimposed basins has certain limitations. Summary of the Invention

[0003] In order to accurately determine the timing of multiple crude oil injection phases in composite roof reservoirs, thereby enriching technical routes and increasing the selection space, this invention provides a method, apparatus, and equipment for determining the timing of multiple crude oil injection phases in composite basins.

[0004] In a first aspect, embodiments of the present invention provide a method for determining the timing of multi-stage crude oil charging in superimposed basins, which may include:

[0005] Based on the physical properties of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, the crude oil charging phases of the superimposed basin are preliminarily divided to obtain the initial charging phases of crude oil.

[0006] Based on the current burial depth and thickness of the strata, the burial pattern of the superimposed basin is restored by mechanical compaction correction in order to restore the burial history of the superimposed basin.

[0007] The homogenization temperature of brine inclusions from different charging phases was projected onto the burial history of the superimposed basin using the fluid inclusion method to obtain the possible times of crude oil charging for different charging phases.

[0008] Based on the results of U-Pb dating tests on diagenetic minerals corresponding to charging periods with at least two possible crude oil charging times, the U-Pb geological age of the diagenetic minerals corresponding to the charging period in the rock thin section sample is determined, so as to correct the possible crude oil charging time based on the U-Pb geological age of the diagenetic minerals and determine the multiple crude oil charging times in the superimposed basin.

[0009] In one embodiment, determining the U-Pb geological age of the diagenetic minerals may include:

[0010] Based on the results of U-Pb dating of the diagenetic minerals included in the rock thin section sample, the rock thin section sample was determined to have... 238 U、 207 Pb and 206 Pb isotope content;

[0011] Based on the rock thin section sample 207 Pb and 206 The isotopic content of Pb was determined. 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation between Pb and ordinary lead ratios;

[0012] Based on the rock thin section sample 238 U and 206 The isotopic content of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The second correlation between measured Pb values;

[0013] Based on the first association and the second association, establish 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The third correlation between measured Pb values;

[0014] Based on standard 238 U / 206 The measured and corrected values ​​of Pb, and the rock thin section samples. 238 U / 206 The measured value of Pb for the rock thin section sample 238 U / 206 The measured values ​​of Pb were fractionated and corrected to determine the rock thin section samples. 238 U / 206 Measured correction value of Pb;

[0015] Based on the aforementioned third relationship and 238 U / 206 The measured correction value of Pb is used to determine the U-Pb age of the diagenetic minerals included in the rock thin section sample.

[0016] In another embodiment, determining the U-Pb age of the included diagenetic minerals in the rock thin section sample includes:

[0017] Based on multiple test points in the rock thin section sample 207 Pb / 206 Measured Pb value 207 Pb / 206 Pb error value, 238 U / 206 Pb measured correction value, 238 U / 206 Pb measured error value, and 207 Pb / 206 Measured Pb value and 238 U / 206 The correlation coefficient of measured Pb correction values ​​was used to construct the U-Pb age map of crude oil charging;

[0018] The test points in the U-Pb age map of the crude oil charge were fitted to obtain... 207 Pb / 206 Measured Pb value and 238 U / 206 Fitting curve of measured Pb correction value;

[0019] The U-Pb ages of the included diagenetic minerals in the rock thin section samples were determined based on the fitted curve.

[0020] In another embodiment, determining the U-Pb geological age of the diagenetic minerals may specifically include:

[0021] Based on the results of U-Pb dating of the diagenetic minerals included in the rock thin section sample, the rock thin section sample was determined to have... 238 U、 207 Pb and 206 Pb isotope content;

[0022] Define variable f 206 = 206 Pb 普通 / 206 Pb 实测 ,but 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation formula between the Pb and ordinary lead ratios is:

[0023]

[0024] in, The diagenetic minerals included in the thin section of the rock. 207 Pb / 206 Radiogenic ratio of Pb; The diagenetic minerals included in the thin section of the rock. 207 Pb / 206 Measured value of Pb; The common lead ratio of the diagenetic minerals included in the thin section of the rock is given.

[0025] variable f 206 = 206 Pb 普通 / 206 Pb 实测 Substituting into the first correlation formula, we get:

[0026]

[0027] For f 206 Solving this problem, we can obtain the following results:

[0028] Based on the rock thin section sample 238 U and 206 The isotopic content of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The formula for the second correlation between the measured values ​​of Pb is:

[0029]

[0030] in, The diagenetic minerals included in the thin section of the rock. 206 Pb / 238 U radiogenicity ratio; The diagenetic minerals included in the thin section of the rock. 206 Pb / 238 Measured value of U;

[0031] The second correlation formula can be converted to obtain:

[0032]

[0033] Based on f 206 The conversion results of the solution and the second correlation formula are used to determine the diagenetic minerals included in the rock thin section sample. 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The formula for the third correlation between measured Pb values ​​is:

[0034]

[0035] Based on the diagenetic minerals included in the rock thin section sample 238 U / 206 Measured Pb values ​​and standard samples 238 U / 206 Measured Pb values ​​and measured correction values ​​for the diagenetic minerals included in the thin section of the rock. 238 U / 206 The measured Pb values ​​were fractionated and corrected to determine the rock thin section samples. 238 U / 206 The relationship between the measured correction values ​​of Pb is:

[0036]

[0037] Based on the third correlation formula and the rock thin section samples 238 U / 206 The relationship between the measured correction values ​​of Pb is used to construct the diagenetic minerals included in the rock thin section samples. 207 Pb / 206 Measured Pb value 207 Pb / 206 The radiogenic ratio of Pb 206 Pb / 238 U radiogenicity ratio, 238 U / 206 The fourth correlation formula for the measured correction value of Pb:

[0038]

[0039] Based on the fourth correlation formula, the U-Pb ages of the diagenetic minerals included in the rock thin section sample are determined.

[0040] In another embodiment, determining the U-Pb ages of the diagenetic minerals included in the rock thin section sample based on the fourth correlation formula may include:

[0041] Based on the fourth correlation formula, determine 206 Pb / 238 U radiogenicity ratio;

[0042] Among them, the rock thin section samples include diagenetic minerals 207 Pb / 206 The radiogenic ratio of Pb is The ordinary lead ratio is the intersection of the fitted curve of the measured point and the vertical axis in the U-Pb age diagram of crude oil charging.

[0043] based on And λ238=1.55125e -10 And the fourth correlation formula is determined 206 Pb / 238 The U-Pb age t of the diagenetic minerals included in the rock thin section sample is determined by the U-Pb ratio.

[0044] In another embodiment, the physical properties of the hydrocarbon inclusions include: the type of mineral present, the color of single-polarized light, the fluorescence color, the wavelength of the main peak of the fluorescence spectrum, the red-green quotient of the fluorescence spectrum, and the occurrence of the inclusions.

[0045] In another embodiment, before initially dividing the crude oil charging phases of the superimposed basin, the process may further include:

[0046] Sandstone containing carbonate diagenetic minerals in the oil reservoir was selected as the rock sample, and double-sided polished thin section samples were prepared based on the rock sample.

[0047] Fluid inclusions in the rock thin section sample were measured under a microscope to determine the physical properties of hydrocarbon inclusions included in the fluid inclusions and the homogenization temperature of brine inclusions associated with the hydrocarbon inclusions.

[0048] Secondly, embodiments of the present invention provide a device for determining the multi-stage crude oil charging time in a superimposed basin, which may include:

[0049] The preliminary classification module is used to preliminarily classify the crude oil charging periods of the superimposed basin based on the physical property parameters of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, so as to preliminarily obtain the charging periods of crude oil.

[0050] The burial history restoration module is used to restore the burial pattern of the superimposed basin based on the current burial depth and thickness of the strata using a mechanical compaction correction method, so as to restore the burial history of the superimposed basin.

[0051] The projection module is used to project the homogenization temperature of brine inclusions from different charging phases onto the burial history of the superimposed basin using the fluid inclusion method, so as to obtain the possible times of crude oil charging for different charging phases.

[0052] The calibration and determination module is used to perform U-Pb dating tests on the diagenetic minerals corresponding to the charging periods, which include at least two possible crude oil charging times, to determine the U-Pb geological age of the diagenetic minerals corresponding to the charging periods in the rock thin section sample, and to correct the possible times of crude oil charging based on the U-Pb geological ages of the diagenetic minerals and determine the multiple crude oil charging times in the superimposed basin.

[0053] Thirdly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining the multi-stage crude oil charging time in an overlapping basin as described in the first aspect.

[0054] Fourthly, embodiments of the present invention provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the multi-stage crude oil charging time in the superimposed basin as described in the first aspect.

[0055] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0056] This invention provides a method, apparatus, and equipment for determining the charging time of multiple phases of crude oil in superimposed basins. This method addresses the limitations of existing techniques for determining the charging time of multiple phases of crude oil in superimposed basins. It utilizes the U-Pb geological age of samples to eliminate the ambiguity in estimating hydrocarbon charging time using the fluid inclusion method, combining the fluid inclusion method and U-Pb dating to jointly determine the charging time of different phases of crude oil in superimposed basins. This method solves the problem of not being able to determine the charging time of multiple phases of crude oil in superimposed basins in existing technologies, providing technical support for oil exploration and development.

[0057] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0058] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0059] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0060] Figure 1 This is a flowchart of a method for determining the multi-stage crude oil charging time in an overlapping basin, provided in an embodiment of the present invention.

[0061] Figure 2 This is a flowchart illustrating a detailed method for determining the timing of multi-stage crude oil injection in superimposed basins, as provided in this embodiment of the invention.

[0062] Figure 3 This is a schematic diagram of the hydrocarbon charging time estimated by basin burial history and fluid inclusion method in an embodiment of the present invention.

[0063] Figure 4 Here is a detailed flowchart for step S26;

[0064] Figure 5 This is an example of a U-Pb age diagram of crude oil charging provided in an embodiment of the present invention;

[0065] Figure 6 This is a schematic diagram of the device for determining the multi-stage crude oil charging time in an overlapping basin provided in an embodiment of the present invention. Detailed Implementation

[0066] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0067] The inventors discovered that, for the fluid inclusion method, due to the influence of multiple phases of tectonic activity in superimposed basins, the same reservoir in a superimposed basin will undergo multiple phases of tectonic uplift, resulting in the reservoir experiencing the same temperature in multiple geological periods. Therefore, the crude oil charging time obtained by the fluid inclusion method is ambiguous. Furthermore, the authigenic illite K-Ar (Ar-Ar) dating method can only determine the earliest charging time of crude oil and cannot obtain the charging times of crude oil from different phases. The authigenic potassium feldspar overrim Ar-Ar dating method has very strict sample requirements. Firstly, potassium feldspar overrims must be found in the sandstone sample; secondly, oil inclusions must be present within the potassium feldspar overrims to represent crude oil charging. Therefore, the stringent sample requirements prevent this method from being widely applied. The U-Pb, Pb-Pb, Rb-Sr, Sm-Nd, and Re-Os isotope dating methods for bitumen, kerogen, and crude oil only determine the average age of a single oil charging event, as U-Pb and Pb-Pb radioactive isotopes decay after a single charging event. This limits their application to basins with multiple oil charging events, making them unsuitable for superimposed basins with multiple oil charging events. Therefore, providing a widely applicable and accurate method for determining the timing of multiple oil charging events in superimposed basins is a pressing issue in the field of oil exploration and development. In view of the above problems, this invention is proposed to provide a method, apparatus, and equipment for determining the timing of multiple oil charging events in superimposed basins, overcoming or at least partially solving these problems.

[0068] This invention provides a method for determining the timing of multiple crude oil charging phases in superimposed basins, referring to... Figure 1 As shown, the method may include the following steps:

[0069] Step S11: Based on the physical properties of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, the crude oil charging periods in the superimposed basin are preliminarily divided to obtain the initial charging periods of crude oil.

[0070] Step S12: Based on the current burial depth and thickness of the strata, the burial pattern of the superimposed basin is restored by mechanical compaction correction to restore the burial history of the superimposed basin.

[0071] It should be noted that the execution order of the above steps S11 and S12 is not important. Step S11 can be executed first and then step S12, or step S12 can be executed first and then step S11. Of course, the above steps S11 and S12 can also be executed simultaneously. This embodiment of the invention does not make any specific limitation on this.

[0072] Step S13: Project the homogenization temperature of brine inclusions from different charging periods onto the superimposed basin burial history using the fluid inclusion method to obtain the possible times of crude oil charging for different charging periods.

[0073] Step S14: Determine the U-Pb geological age of the diagenetic minerals corresponding to the charging period in the rock thin section sample based on the results of U-Pb dating tests on the diagenetic minerals corresponding to the charging period, which includes at least two possible crude oil charging times.

[0074] Step S15: Correct the possible timing of crude oil charging based on the U-Pb geological age of diagenetic minerals and determine the timing of multiple crude oil charging phases in the superimposed basin.

[0075] The method for determining the multi-stage crude oil charging time in superimposed basins provided in this invention addresses the limitations of existing technologies in determining the multi-stage crude oil charging time in superimposed basins. It utilizes the U-Pb geological age of samples to eliminate the ambiguity in estimating hydrocarbon charging time using the fluid inclusion method, combining the fluid inclusion method and the U-Pb dating method to jointly determine the charging time of different stages of crude oil in superimposed basins. This method solves the problem of not being able to determine the multi-stage crude oil charging time in superimposed basins in existing technologies, providing technical support for oil exploration and development.

[0076] In a detailed embodiment, refer to Figure 2 As shown in the figure, this embodiment of the invention provides a detailed method for determining the timing of multi-stage crude oil charging in superimposed basins, which may include the following steps:

[0077] Step S21: Select sandstone containing carbonate rock minerals in the oil reservoir as a rock sample, and prepare double-sided polished thin section samples based on the rock sample.

[0078] In this step, sandstone containing carbonate diagenetic minerals from the oil reservoir is selected as the experimental subject. These diagenetic minerals may include calcite, dolomite, etc. The rock sample is then polished into a double-sided thin section for microscopic observation of fluid inclusions.

[0079] Step S22: Measure fluid inclusions in the rock thin section sample under a microscope to determine the physical properties of hydrocarbon inclusions included in the fluid inclusions and the homogenization temperature of brine inclusions associated with the hydrocarbon inclusions.

[0080] In rock thin section samples, fluid inclusions can be classified into hydrocarbon inclusions and brine inclusions. In the existing technology, the type of inclusion is distinguished by fluorescence. If there is a fluorescent color, it indicates that it is a hydrocarbon inclusion.

[0081] The physical properties of hydrocarbon inclusions in this step may include: the type of mineral containing the inclusions, the color of the single-polarized light, the fluorescence color, and the wavelength of the main peak of the fluorescence spectrum (λ). max ), fluorescence spectrum red-green quotient (Q) 650 / 500 ) and inclusion occurrence.

[0082] Step S23: Based on the physical properties of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, the crude oil charging periods in the superimposed basin are preliminarily divided to obtain the initial charging periods of crude oil.

[0083] This step preliminarily classifies the crude oil charging phases of the superimposed basin based on the physical properties of hydrocarbon inclusions determined in step S22. In a specific example, referring to Table 1, the physical properties of hydrocarbon inclusions preliminarily classify the crude oil charging phases of the superimposed basin as follows:

[0084] Table 1. Preliminary classification of crude oil charging phases in superimposed basins based on the physical properties of hydrocarbon inclusions.

[0085]

[0086] Based on the properties of the hydrocarbon inclusions shown in Table 1 above, it can be determined that the reservoir corresponding to this example exhibits two phases of oil charging. The first phase is characterized by yellow fluorescent crude oil charging, λ max Parameters are between 530 and 534 nm, Q 650 / 500 The parameters range from 0.48 to 0.51, and the minerals are trapped within the diagenetic minerals, occurring as primary inclusions; the second phase is characterized by blue fluorescent crude oil charging, λ max Parameters range from 482 to 494 nm, Q 650 / 500 The parameters range from 0.18 to 0.30, and they are captured in diagenetic minerals and exist as secondary inclusions.

[0087] Step S24: Based on the current burial depth and thickness of the strata, the burial pattern of the superimposed basin is restored by mechanical compaction correction to restore the burial history of the superimposed basin.

[0088] This step involves reconstructing the burial history of the superimposed basin. During the burial history reconstruction process, mechanical compaction is selected as the compaction method, and the formula used for compaction correction is shown in Formula 1 below:

[0089]

[0090] in, Formation porosity, Let be the initial porosity of the formation, K be the compaction factor, and z be the formation depth. For sandstone formations, The value is 40%–50%, and K ranges from 1.5 to 2.0 km. -1 For mudstone and shale formations, The percentage is 50%–70%, and the depth (K) is 2.0–2.5 km. -1 .

[0091] Based on the consideration of the changes in stratum thickness caused by porosity with depth (Formula 1), this embodiment of the invention obtains the paleoburial depth of each stratum unit by stripping back the present sedimentary thickness of each stratum unit, thereby reconstructing the burial history of the basin.

[0092] It should be noted that the execution order of steps S23 and S24 is not important. Step S23 can be executed first and then step S24, or step S24 can be executed first and then step S23. Of course, steps S23 and S24 can also be executed simultaneously. This embodiment of the invention does not impose any specific limitations on this.

[0093] Step S25: Project the homogenization temperature of brine inclusions from different charging periods onto the burial history of the superimposed basin using the fluid inclusion method to obtain the possible times of crude oil charging for different charging periods.

[0094] This step, based on the homogenization temperature of the brine inclusions associated with hydrocarbon inclusions determined in step S22, projects the homogenization temperature onto the burial history to obtain the possible times of crude oil charging in different phases. It should be noted that the homogenization temperature of the brine inclusions associated with hydrocarbon inclusions can be determined in step S22, or after the initial division in step S23 to obtain multiple phases (two types of hydrocarbon inclusions in this example), the homogenization temperature of the brine inclusions associated with hydrocarbon inclusions in each phase can be determined separately. This embodiment of the invention does not specifically limit this approach. (Refer to...) Figure 3As shown, based on the basin's burial history and the hydrocarbon charging time estimated by the fluid inclusion method, homogenization temperatures were measured for brine inclusions associated with two types of hydrocarbon inclusions. Using the fluid inclusion method, the charging time of the second phase of crude oil was inferred to be 110 Ma. Figure 3 For the first phase of crude oil charging, the charging time inferred using the fluid inclusion method has multiple interpretations. The first possible charging time is 280 Ma, and the second possible charging time is 227 Ma. Figure 3 ).

[0095] Step S26: Determine the U-Pb geological age of the diagenetic minerals corresponding to the charging period in the rock thin section sample based on the results of U-Pb dating tests on the diagenetic minerals corresponding to the charging period, which includes at least two possible crude oil charging times.

[0096] This step determines the U-Pb geological age of the diagenetic minerals corresponding to the specific charging period in the rock thin section sample. When implementing this step, refer to... Figure 4 As shown, the following steps may be included:

[0097] Step S261: Based on the results of U-Pb dating of the diagenetic minerals included in the rock thin section sample, determine the rock thin section sample's... 238 U、 207 Pb and 206 The isotopic content of Pb.

[0098] Step S262, based on rock thin section samples 207 Pb and 206 The isotopic content of Pb was determined. 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation between Pb and ordinary lead ratio.

[0099] In this step, the variable f is defined. 206 = 206 Pb 普通 / 206 Pb 实测 ,but 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation formula (Formula 2) between the Pb and ordinary lead ratios is:

[0100]

[0101] in, Diagenetic minerals included in thin section samples of rocks 207 Pb / 206 Radiogenic ratio of Pb; Diagenetic minerals included in thin section samples of rocks 207 Pb / 206 Measured value of Pb; The common lead ratio of the diagenetic minerals included in the rock thin section sample;

[0102] variable f 206 = 206 Pb 普通 / 206 Pb 实测 Substituting the first correlation formula, we obtain Formula 3 as shown below:

[0103]

[0104] For f 206 Solving this equation, we obtain Formula 4 as shown below:

[0105]

[0106] Step S263, based on rock thin section samples 238 U and 206 The isotopic content of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The second correlation between the measured Pb values.

[0107] In this step, based on the rock thin section samples... 238 U and 206 The geological age of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The second correlation formula (Formula 5) between the measured Pb values ​​is:

[0108]

[0109] in, Diagenetic minerals included in thin section samples of rocks 206 Pb / 238 U radiogenicity ratio; Diagenetic minerals included in thin section samples of rocks 206 Pb / 238 Measured value of U;

[0110] The formula for the second correlation relationship can be converted to obtain Formula 6 as shown below:

[0111]

[0112] Step S264: Based on the first association relationship and the second association relationship, establish... 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The third correlation between measured Pb values.

[0113] In this step, based on step S262f 206 The solution results and the conversion results of the second correlation formula in step S263 determine the diagenetic minerals included in the rock thin section sample. 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The third correlation formula (Formula 7) between the measured values ​​of Pb is:

[0114]

[0115] Step S265, based on standard samples 238 U / 206 Measured and corrected values ​​of Pb, and rock thin section samples 238 U / 206 Measured values ​​of Pb for rock thin section samples 238 U / 206 The measured values ​​of Pb were fractionated and corrected to determine the rock thin section samples. 238 U / 206 Measured correction value of Pb.

[0116] This step involves determining the rock thin section samples. 238 U / 206 The relationship between the measured correction values ​​of Pb (Formula 8) is as follows:

[0117]

[0118] Step S266, based on the third association and 238 U / 206 The measured correction values ​​of Pb were used to determine the U-Pb ages of the diagenetic minerals included in the rock thin section samples.

[0119] Referring to Table 2, the test results and errors of the test points of the rock thin section samples in this invention example are as follows:

[0120] Table 2 Test results and errors at test points of rock thin section samples

[0121]

[0122]

[0123]

[0124] In the specific implementation of step S266 above, it is first based on multiple test points in the rock thin section sample. 207 Pb / 206 Measured Pb value 207 Pb / 206 Pb error value, 238 U / 206 Pb measured correction value, 238 U / 206 Pb measured error value, and 207 Pb / 206 Measured Pb value and 238 U / 206 Correlation coefficients of measured Pb correction values ​​were used to construct a U-Pb age map of crude oil charging (refer to...). Figure 5 (As shown); then, the test points in the U-Pb age diagram of the crude oil charge are fitted to obtain... 207 Pb / 206 Measured Pb value and 238 U / 206 The fitting curve of the measured Pb correction value was used; finally, the U-Pb age of the included diagenetic minerals in the rock thin section sample was determined based on the fitting curve.

[0125] In this step, the first step is based on the third correlation formula and the rock thin section samples. 238 U / 206 The relationship between the measured correction values ​​of Pb is used to construct the diagenetic minerals included in rock thin section samples. 207 Pb / 206 Measured Pb value 207 Pb / 206 The radiogenic ratio of Pb 206 Pb / 238 U radiogenicity ratio, 238 U / 206 The fourth correlation formula for the measured correction value of Pb (Formula 9):

[0126]

[0127] Then, based on the fourth correlation formula, the U-Pb ages of the included diagenetic minerals in the rock thin section samples were determined.

[0128] In practice, the first step is to determine based on the fourth association formula. 206 Pb / 238U-radiogenic ratio; among which, the diagenetic minerals included in the rock thin section sample. 207 Pb / 206 The radiogenic ratio of Pb is The ordinary lead ratio is the intersection of the fitted curve of the measured point and the vertical axis in the U-Pb age diagram of crude oil charging.

[0129] The second step, based on And λ238=1.55125e -10 And the fourth correlation formula is determined 206 Pb / 238 U-radiogenic ratios were used to determine the U-Pb ages (t) of the diagenetic minerals included in thin rock sections.

[0130] Reference Figure 5 As shown, the fluid inclusion method cannot accurately predict the charging time for the first phase of crude oil charging. We selected samples containing yellow fluorescent oil inclusions and conducted U-Pb dating tests on them. After fractionation correction and ordinary lead correction of the samples using formulas 2-5, the charging time of the first phase of crude oil was obtained as 226.4 ± 1.4 Ma.

[0131] Step S27: Correct the possible timing of crude oil charging based on the U-Pb geological age of diagenetic minerals and determine the multiple phases of crude oil charging in the superimposed basin. In this example, the U-Pb age of the first phase of crude oil charging is 226.4 ± 1.4 Ma, thus excluding the possible charging time of 280 Ma inferred by the fluid inclusion method. The U-Pb age of the first phase of crude oil charging (226.4 ± 1.4 Ma) is in good agreement with the possible charging time of 227 Ma estimated by the fluid inclusion method, indicating that the first phase of crude oil charging time inferred by the fluid inclusion method as 227 Ma is relatively accurate. Based on the combined method of fluid inclusion method and U-Pb dating, the charging time of the first phase of crude oil in the superimposed basin is jointly determined to be 227 Ma, and the charging time of the second phase of crude oil is determined to be 110 Ma. This step utilizes the U-Pb age of the samples to eliminate the ambiguity in estimating hydrocarbon charging time using the fluid inclusion method. It combines the fluid inclusion method and the U-Pb dating method to jointly determine the charging time of crude oil from different periods in the superimposed basin.

[0132] It should be noted that steps S21 and S22 are not computer-executed steps, but are implemented with human participation in the screening and based on device measurement; the data processing process of steps S23 to S27 in this embodiment can be implemented based on a computer, and this embodiment of the invention does not specifically limit it.

[0133] The method provided in this embodiment of the invention can accurately determine the charging time of multiple phases of crude oil in superimposed basins. Firstly, it is based on the single-polarized light color, fluorescence color, and λ of hydrocarbon inclusions in diagenetic minerals. max Parameters, Q 650 / 500 The parameters and occurrence are used to classify the crude oil charging periods. Then, by combining the burial history, the possible time of crude oil charging in the superimposed basin is initially estimated using the fluid inclusion method. Finally, the U-Pb age of the crude oil charging is used to eliminate the ambiguity of the fluid inclusion method. Then, based on the combination of the fluid inclusion method and the U-Pb dating method, the charging time of crude oil in different periods in the superimposed basin is accurately determined.

[0134] Based on the same inventive concept, this invention also provides a device for determining the multi-stage crude oil charging time in superimposed basins, referring to... Figure 6 As shown, the device may include: a preliminary division module 61, a burial history recovery module 62, a projection module 63, and a correction and determination module 64, and its working principle is as follows:

[0135] The preliminary classification module 61 is used to preliminarily classify the crude oil charging periods of the superimposed basin based on the physical property parameters of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, so as to preliminarily obtain the charging periods of crude oil.

[0136] The burial history restoration module 62 is used to restore the burial history of the superimposed basin by mechanical compaction correction based on the current burial depth and thickness of the strata.

[0137] Projection module 63 is used to project the homogenization temperature of brine inclusions from different charging periods onto the burial history of the superimposed basin using the fluid inclusion method, so as to obtain the possible time of crude oil charging for different charging periods.

[0138] The correction and determination module 64 is used to perform U-Pb dating tests on the diagenetic minerals corresponding to the charging periods, which include at least two possible times of crude oil charging, to determine the U-Pb geological age of the diagenetic minerals corresponding to the charging period in the rock thin section sample, and to correct the possible times of crude oil charging based on the U-Pb geological age of the diagenetic minerals and determine the multiple crude oil charging times in the superimposed basin.

[0139] Based on the same inventive concept, this embodiment of the invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-mentioned method for determining the multi-stage crude oil charging time in superimposed basins.

[0140] Based on the same inventive concept, this embodiment of the invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the above-mentioned method for determining the multi-stage crude oil charging time in the superimposed basin.

[0141] The principles by which the above-mentioned devices, media, and related equipment in the embodiments of the present invention solve the problem are similar to those of the aforementioned methods. Therefore, their implementation can refer to the implementation of the aforementioned methods, and repeated details will not be repeated.

[0142] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0143] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0144] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0145] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0146] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for determining the timing of multi-stage crude oil charging in a superimposed basin, characterized in that, include: Based on the physical properties of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, the crude oil charging phases of the superimposed basin are preliminarily divided to obtain the initial charging phases of crude oil. Based on the current burial depth and thickness of the strata, the burial pattern of the superimposed basin is restored by mechanical compaction correction in order to restore the burial history of the superimposed basin. The homogenization temperature of brine inclusions from different charging phases was projected onto the burial history of the superimposed basin using the fluid inclusion method to obtain the possible times of crude oil charging for different charging phases. Based on the results of U-Pb dating tests on diagenetic minerals corresponding to charging periods with at least two possible crude oil charging times, the U-Pb geological age of the diagenetic minerals corresponding to the charging period in the rock thin section sample is determined, so as to correct the possible crude oil charging time based on the U-Pb geological age of the diagenetic minerals and determine the multiple crude oil charging times in the superimposed basin.

2. The method according to claim 1, characterized in that, Determining the U-Pb geological age of the diagenetic minerals includes: Based on the results of U-Pb dating of the diagenetic minerals included in the rock thin section sample, the rock thin section sample was determined to have... 238 U、 207 Pb and 206 Pb isotope content; Based on the rock thin section sample 207 Pb and 206 The isotopic content of Pb was determined. 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation between Pb and ordinary lead ratios; Based on the rock thin section sample 238 U and 206 The isotopic content of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The second correlation between measured Pb values; Based on the first association and the second association, establish 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The third correlation between measured Pb values; Based on standard 238 U / 206 The measured and corrected values ​​of Pb, and the rock thin section samples. 238 U / 206 The measured value of Pb for the rock thin section sample 238 U / 206 The measured values ​​of Pb were fractionated and corrected to determine the rock thin section samples. 238 U / 206 Measured correction value of Pb; Based on the aforementioned third relationship and 238 U / 206 The measured correction value of Pb is used to determine the U-Pb age of the diagenetic minerals included in the rock thin section sample.

3. The method according to claim 2, characterized in that, The U-Pb ages of the included diagenetic minerals in the rock thin section samples were determined by: Based on multiple test points in the rock thin section sample 207 Pb / 206 Measured Pb value 207 Pb / 206 Pb error value, 238 U / 206 Pb measured correction value, 238 U / 206 Pb measured error value, and 207 Pb / 206 Measured Pb value and 238 U / 206 The correlation coefficient of measured Pb correction values ​​was used to construct the U-Pb age map of crude oil charging; The test points in the U-Pb age map of the crude oil charge were fitted to obtain... 207 Pb / 206 Measured Pb value and 238 U / 206 Fitting curve of measured Pb correction value; The U-Pb ages of the included diagenetic minerals in the rock thin section samples were determined based on the fitted curve.

4. The method according to claim 3, characterized in that, Determining the U-Pb geological age of the diagenetic minerals specifically includes: Based on the results of U-Pb dating of the diagenetic minerals included in the rock thin section sample, the rock thin section sample was determined to have... 238 U、 207 Pb and 206 Pb isotope content; Define variable f 206 = 206 Pb 普通 / 206 Pb 实测 ,but 207 Pb / 206 The radiogenic ratio of Pb 207 Pb / 206 Measured Pb value and 207 Pb / 206 The first correlation formula between the Pb and ordinary lead ratios is: in, The diagenetic minerals included in the thin section of the rock. 207 Pb / 206 Radiogenic ratio of Pb; The diagenetic minerals included in the thin section of the rock. 207 Pb / 206 Measured value of Pb; The common lead ratio of the diagenetic minerals included in the thin section of the rock is given. variable f 206 = 206 Pb 普通 / 206 Pb 实测 Substituting into the first correlation formula, we get: For f 206 Solving this problem, we can obtain the following results: Based on the rock thin section sample 238 U and 206 The isotopic content of Pb was determined. 238 U / 206 Pb radiogenic ratio, 238 U / 206 The formula for the second correlation between the measured values ​​of Pb is: in, The diagenetic minerals included in the thin section of the rock. 206 Pb / 238 U radiogenicity ratio; The diagenetic minerals included in the thin section of the rock. 206 Pb / 238 Measured value of U; The second correlation formula can be converted to obtain: Based on f 206 The conversion results of the solution and the second correlation formula are used to determine the diagenetic minerals included in the rock thin section sample. 207 Pb / 206 The radiogenic ratio of Pb and 238 U / 206 The formula for the third correlation between measured Pb values ​​is: Based on the diagenetic minerals included in the rock thin section sample 238 U / 206 Measured Pb values ​​and standard samples 238 U / 206 Measured Pb values ​​and measured correction values ​​for the diagenetic minerals included in the thin section of the rock. 238 U / 206 The measured Pb values ​​were fractionated and corrected to determine the rock thin section samples. 238 U / 206 The formula for the measured correction value of Pb is: Based on the third correlation formula and the rock thin section samples 238 U / 206 The relationship between the measured correction values ​​of Pb is used to construct the diagenetic minerals included in the rock thin section samples. 207 Pb / 206 Measured Pb value 207 Pb / 206 The radiogenic ratio of Pb 206 Pb / 238 U radiogenicity ratio, 238 U / 206 The fourth correlation formula for the measured correction value of Pb: Based on the fourth correlation formula, the U-Pb ages of the diagenetic minerals included in the rock thin section sample are determined.

5. The method according to claim 4, characterized in that, Based on the fourth correlation formula, the U-Pb ages of the diagenetic minerals included in the rock thin section sample are determined, including: Based on the fourth correlation formula, determine 206 Pb / 238 U radiogenicity ratio; Among them, the rock thin section samples include diagenetic minerals 207 Pb / 206 The radiogenic ratio of Pb is The ordinary lead ratio is the intersection of the fitted curve of the measured point and the vertical axis in the U-Pb age diagram of crude oil charging. based on And λ238=1.55125e -10 And the fourth correlation formula is determined 206 Pb / 238 The U-Pb age t of the diagenetic minerals included in the rock thin section sample is determined by the U-Pb ratio.

6. The method according to any one of claims 1 to 5, characterized in that, The physical properties of the hydrocarbon inclusions include: the type of mineral present, the color under single polarized light, the fluorescence color, the wavelength of the main peak of the fluorescence spectrum, the red-green quotient of the fluorescence spectrum, and the occurrence of the inclusions.

7. The method according to any one of claims 1 to 5, characterized in that, Before making a preliminary division of the crude oil charging phases in the superimposed basin, the following steps are also included: Sandstone containing carbonate diagenetic minerals in the oil reservoir was selected as the rock sample, and double-sided polished thin section samples were prepared based on the rock sample. Fluid inclusions in the rock thin section sample were measured under a microscope to determine the physical properties of hydrocarbon inclusions included in the fluid inclusions and the homogenization temperature of brine inclusions associated with the hydrocarbon inclusions.

8. A device for determining the duration of multi-stage crude oil charging in a superimposed basin, characterized in that, include: The preliminary classification module is used to preliminarily classify the crude oil charging periods of the superimposed basin based on the physical property parameters of hydrocarbon inclusions in rock samples corresponding to oil reservoirs in the superimposed basin, so as to preliminarily obtain the charging periods of crude oil. The burial history restoration module is used to restore the burial pattern of the superimposed basin based on the current burial depth and thickness of the strata using a mechanical compaction correction method, so as to restore the burial history of the superimposed basin. The projection module is used to project the homogenization temperature of brine inclusions from different charging phases onto the burial history of the superimposed basin using the fluid inclusion method, so as to obtain the possible times of crude oil charging for different charging phases. The calibration and determination module is used to perform U-Pb dating tests on the diagenetic minerals corresponding to the charging periods, which include at least two possible crude oil charging times, to determine the U-Pb geological age of the diagenetic minerals corresponding to the charging periods in the rock thin section sample, and to correct the possible times of crude oil charging based on the U-Pb geological ages of the diagenetic minerals and determine the multiple crude oil charging times in the superimposed basin.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the method for determining the multi-stage crude oil injection time in the superimposed basin as described in any one of claims 1 to 6.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for determining the multi-stage crude oil injection time in the superimposed basin as described in any one of claims 1 to 6.

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