Methods, apparatus, electronic equipment, and storage media for determining the source of marine petroleum in different lithologies.

Abstract

This invention discloses a method, apparatus, electronic device, and storage medium for determining the source of marine petroleum from different lithologies. The method includes: determining a target content ratio corresponding to a target crude oil, whereby the target content ratio indicates the content ratio between a first type of compound and a second type of compound in the target crude oil; determining reference content ratios corresponding to multiple reference crude oils, where each reference content ratio indicates the content ratio between a first type of compound and a second type of compound in the reference crude oil; and determining the source of the target crude oil based on the target content ratio and the reference content ratios of the multiple reference crude oils, wherein each reference crude oil is pre-associated with the lithofacies type of the source rock from which it originates. This method improves the accuracy of determining the lithofacies type of the source rock from which marine petroleum from different lithologies originates.

Description

Technical Field

[0001] This invention relates to the field of petroleum geological exploration technology, and in particular to a method, apparatus, electronic device and storage medium for determining the source of marine petroleum with different lithologies. Background Technology

[0002] In recent years, ultra-deep oil and gas exploration has become an important area for increasing oil and gas reserves and production, with oil and gas resources generally buried at depths exceeding 6,000m to 8,000m. Meanwhile, the sedimentary basins where ultra-deep marine oil and gas are found are all small cratonic basins, with multiple tectonic evolution cycles and dramatic sedimentary facies changes. Therefore, multiple sets of strata develop source rocks with different sedimentary facies zones, undergoing differential burial and hydrocarbon generation processes, resulting in oil and gas reservoirs generally exhibiting characteristics of multiple source foci and multi-stage mixed sources.

[0003] Currently, methods for tracing the origin of marine crude oil typically employ hydrocarbon source tracers such as steranes and terpenes, which can effectively classify the origins of crude oil at medium to low maturity stages (maturity Ro between 0.5% and 1%), marine-continental facies, and coal-bearing crude oil. However, these hydrocarbon source tracers begin to degrade at the peak of oil generation (maturity Ro > 1%), and their content cannot effectively determine the origin of highly mature crude oil at different lithologies in ultra-deep formations (maturity Ro between 1% and 1.6%). This results in poor accuracy in determining the origin of crude oil and prevents the fine classification of source rocks of different sedimentary facies within marine environments. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and storage medium for determining the source of marine oil in different lithologies, in order to solve the problem of poor accuracy in determining the source of crude oil in different lithologies at high maturity stages in ultra-deep marine strata.

[0005] According to one aspect of the present invention, a method for determining the source of marine petroleum with different lithologies is provided, the method comprising:

[0006] Determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compounds and the second type of compounds in the target crude oil. The target crude oil is a crude oil sample collected from the source rock of marine strata. The first type of compounds belongs to one of the four-cage adamantane series, the five-cage adamantane series, and the six-cage adamantane series. The second type of compounds belongs to the three-cage adamantane series.

[0007] Multiple reference crude oils were determined, each corresponding to a reference content ratio. Each reference content ratio was used to indicate the content ratio between the first type of compounds and the second type of compounds in the reference crude oil. The multiple reference crude oils were obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that were collected in advance.

[0008] The source of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source of the target crude oil is used to indicate the lithofacies type of the source rock from which the target crude oil originates.

[0009] According to another aspect of the present invention, an apparatus for determining the source of marine petroleum with different lithologies is provided, the apparatus comprising:

[0010] The first determining module is used to determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the target crude oil. The target crude oil is a crude oil sample collected from the source rock of the marine strata. The first type of compound belongs to one of the four-cage adamantane series compounds, the five-cage adamantane series compounds, and the six-cage adamantane series compounds. The second type of compound belongs to the three-cage adamantane series compounds.

[0011] The second determining module is used to determine the reference content ratio corresponding to each of the multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance.

[0012] The third determination module is used to determine the source result of the target crude oil based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock to which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock to which the target crude oil originates.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] At least one processor; and

[0015] A memory that is communicatively connected to at least one processor; wherein,

[0016] The memory stores a computer program that can be executed by at least one processor, such that the at least one processor is able to perform the method for determining the source of marine petroleum of different lithologies according to any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided storing computer instructions for causing a processor to execute a method for determining different lithologic marine petroleum sources according to any embodiment of the present invention.

[0018] The technical solution of this invention involves determining a target content ratio corresponding to a target crude oil, where the target content ratio indicates the ratio of the content of a first type of compound to a second type of compound in the target crude oil; determining reference content ratios corresponding to multiple reference crude oils, where each reference content ratio indicates the ratio of the content of a first type of compound to a second type of compound in the reference crude oil; and determining the source of the target crude oil based on the target content ratio and the reference content ratios of the multiple reference crude oils, wherein each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source results of the target crude oil are used to indicate the lithofacies type of the source rock from which the target crude oil originates. By comparing the target content ratio with multiple reference content ratios, the lithofacies type of the source rock from which the target crude oil originates can be determined. Furthermore, the first and second class compounds belong to the adamantane series compounds, which have high thermal stability and specificity, thus improving the accuracy of determining the source results of the target crude oil. This makes it suitable for comparing oil and source rocks at high maturity stages, so as to classify source rocks of different sedimentary facies or rock types in marine strata, thereby providing a basis for the source research of ultra-deep high-temperature oil and gas reservoirs.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A flowchart illustrating a method for determining the source of marine petroleum with different lithologies, provided as an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the molecular structure of a series of compounds from tricrystal to hexacrystal provided in an embodiment of the present invention;

[0023] Figure 3 A graph showing the target content ratio of a target crude oil and the reference content ratio of a reference crude oil, provided in an embodiment of the present invention;

[0024] Figure 4A flowchart illustrating another method for determining the source of marine petroleum with different lithologies, provided as an embodiment of the present invention;

[0025] Figure 5 The mass spectra of a first-class compound and a second-class compound corresponding to a target crude oil and a reference crude oil, respectively, provided for embodiments of the present invention;

[0026] Figure 6 A schematic diagram of a device for determining the source of marine petroleum with different lithologies provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of an electronic device for implementing a method for determining the source of marine petroleum with different lithologies, as provided in an embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] Figure 1 This is a flowchart illustrating a method for determining the source of marine petroleum in different lithologies, as provided in an embodiment of the present invention. This embodiment is applicable to determining the lithological type of source rocks from crude oil collected in marine strata under different sedimentary environments. The method can be executed by a device for determining the source of marine petroleum in different lithologies. This device can be implemented in hardware and / or software and can be configured in an electronic device that implements the method for determining the source of marine petroleum in different lithologies.

[0031] like Figure 1 As shown, the method specifically includes:

[0032] S101. Determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the target crude oil. The target crude oil is a crude oil sample collected from the source rock of marine strata. The first type of compound belongs to one of the tetracage adamantane series, the pentacage adamantane series, and the hexacage adamantane series. The second type of compound belongs to the tricage adamantane series.

[0033] In this embodiment of the invention, the target crude oil can refer to crude oil samples collected from source rocks in different sedimentary environments within marine strata. Source rocks can refer to rocks rich in organic matter that can generate and release oil and gas, serving as the material basis for oil and gas generation. Optionally, the target crude oil can be a crude oil sample collected from source rocks in marine strata at a predetermined depth that meets predetermined conditions. The predetermined depth can be 6000m. The predetermined conditions can be that the maturity Ro of the crude oil sample is greater than 1.0%.

[0034] refer to Figure 2 The molecular structures of tricryptanine to hexacryptanine compounds are shown. The tricryptanine compound has a highly symmetrical cage-like structure formed by the fusion of three cyclohexane rings, exhibiting high thermal stability, chemical stability, and strong lipophilicity. The molecular structures of tetracryptanine to hexacryptanine compounds are similar to those of the tricryptanine compound, also possessing extremely high thermal stability.

[0035] Specifically, the tricryptane compounds extracted from the target crude oil can be classified as Class II compounds, and one of the tetracryptane series, pentacryptane series, or hexacryptane series compounds extracted from the target crude oil can be classified as Class I compounds. Furthermore, the target content ratio of the target crude oil can be determined based on the ratio between the content values ​​of Class I compounds and Class II compounds in the target crude oil.

[0036] S102. Determine the reference content ratio corresponding to each of the multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance.

[0037] In this embodiment of the invention, the reference crude oil may refer to a crude oil sample obtained from soluble organic matter extracted from a source rock sample. Soluble organic matter refers to organic matter in the source rock sample that can be dissolved or extracted by organic solvents, and is a mixture of various compounds with similar solubility. Under specific temperature and pressure conditions, soluble organic matter can be converted into crude oil and natural gas through a series of chemical reactions. These chemical reactions include processes such as pyrolysis and catalytic conversion, which gradually enrich and concentrate the hydrocarbons in the organic matter. Crude oil is mainly composed of hydrocarbon compounds, including saturated hydrocarbons and aromatic hydrocarbons. These hydrocarbon compounds are converted from soluble organic matter in source rocks. Therefore, soluble organic matter in source rocks is the main source of crude oil.

[0038] Tricrystald adamantane compounds originate from the isomerization and rearrangement of tricyclic decannes in biomarkers via Lewis acid-catalyzed processes. Therefore, the content of tricrystald adamantane varies in crude oils obtained from source rocks of different facies types. Furthermore, tetracrystald to hexacrystald adamantane compounds are formed through the homogenization reaction of tricrystald adamantane compounds under high temperature and pressure conditions. Thus, the content of tetracrystald to hexacrystald adamantane compounds in crude oil can indicate the facies type of the source rock from which the crude oil originates.

[0039] Specifically, for source rock samples of different lithofacies types, soluble organic matter corresponding to each source rock sample can be dissolved using organic solvents. Then, multiple reference crude oils can be obtained based on the soluble organic matter corresponding to each source rock sample of different lithofacies types. The reference content ratio for each reference crude oil can then be determined based on the ratio between the content values ​​of the first type of compounds and the content values ​​of the second type of compounds in each reference crude oil.

[0040] Optionally, the depositional environments of source rocks in marine strata are mainly slope facies, shelf facies, and intraplatform depression facies. Correspondingly, source rock samples of different lithofacies types can include mudstone source rock samples or carbonate source rock samples. The organic matter in mudstone source rock samples is rich in mudstone, while the organic matter in carbonate source rock samples is rich in carbonate rock. Furthermore, source rock samples of different lithofacies types are first pulverized. For example, source rock samples with a mudstone content exceeding 50% can be pulverized to 80–100 mesh, while those with a carbonate rock content exceeding 50% can be pulverized to 60–80 mesh. Then, soluble organic matter in the pulverized source rock samples is extracted using an organic solvent. The main component of the organic solvent can be dichloromethane. Finally, the extracted soluble organic matter is distilled at a preset temperature, and the resulting fraction is used to enrich tricrystalamane to hexacrystalamane series compounds. For example, the extracted soluble organic matter is distilled at 300°C (equivalent to atmospheric equivalent boiling point @ 10-50 Torr) to remove monoadamantane compounds, diadamantane compounds, natural alkyl compounds, and non-adamantane light hydrocarbons. Furthermore, the distillate above 300°C is first vacuum distilled, and the obtained distillate is then distilled again to extract the fraction below 550°C (equivalent to atmospheric equivalent boiling point @ < 5 Torr), which is used to enrich tri- and hexa-adamantane series compounds, suitable for tracing and correlating the source of crude oil in different sedimentary environments in mature marine strata.

[0041] As an optional embodiment of the present invention, the sample amount of the target crude oil and each soluble organic matter is not less than 100 mg.

[0042] In this embodiment of the invention, the sample amount of the target crude oil is not less than 100 mg, and the sample amount of each soluble organic matter is also not less than 100 mg, so as to ensure the accuracy of the source results of the target crude oil.

[0043] S103. The source result of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock from which the target crude oil originates.

[0044] In this embodiment of the invention, the source result can refer to the lithofacies type of the source rock from which the target crude oil originates. Specifically, based on the target content ratio corresponding to the target crude oil, the reference content ratio corresponding to each of the multiple reference crude oils, and the lithofacies type of the source rock from which each reference crude oil is pre-associated, the lithofacies type of the source rock from which the target crude oil originates can be determined, thereby determining the source result of the target crude oil.

[0045] It should be noted that the accuracy of determining the source of the target crude oil increases sequentially when the first category of compounds belongs to the tetracage adamantane series, the pentacage adamantane series, and the hexacage adamantane series. For example, refer to... Figure 3 Taking mudstone and carbonate shale as examples of the lithofacies types of the source rocks of the crude oil, the second category of compounds in the target crude oil and the reference crude oil belong to tricryptane compounds, while the first category of compounds successively belong to tetracryptane series compounds, pentacryptane series compounds, and hexacryptane series compounds. Therefore, it can be concluded that... Figure 3 The target content ratio of the target crude oil shown is similar to the reference content ratio of the reference crude oil derived from mudstone source rocks, therefore it can be determined that... Figure 3 The source rock of the target crude oil shown belongs to the mudstone type.

[0046] As an optional implementation of the present invention, the source result of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. This includes: taking the lithofacies type of the source rock of the candidate crude oil associated with the candidate crude oil among the multiple reference crude oils as the lithofacies type of the source rock of the target crude oil, and the deviation between the reference content ratio corresponding to the candidate crude oil and the target content ratio is less than the deviation between the reference content ratio corresponding to the reference crude oil other than the candidate crude oil and the target content ratio.

[0047] In this embodiment of the invention, the candidate crude oil can refer to the reference crude oil with the smallest deviation between the corresponding reference content ratio and the target content ratio among all reference crude oils. The deviation can be either a difference or a ratio. Furthermore, the lithofacies type of the source rock from which the candidate crude oil originates can be used as the lithofacies type of the source rock from which the target crude oil originates, thereby determining the source of the target crude oil.

[0048] The technical solution of this invention involves determining a target content ratio corresponding to a target crude oil, where the target content ratio indicates the ratio of the content of a first type of compound to a second type of compound in the target crude oil; determining reference content ratios corresponding to multiple reference crude oils, where each reference content ratio indicates the ratio of the content of a first type of compound to a second type of compound in the reference crude oil; and determining the source of the target crude oil based on the target content ratio and the reference content ratios of the multiple reference crude oils, wherein each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source results of the target crude oil are used to indicate the lithofacies type of the source rock from which the target crude oil originates. By comparing the target content ratio with multiple reference content ratios, the lithofacies type of the source rock from which the target crude oil originates can be determined. Furthermore, the first and second class compounds belong to the adamantane series compounds, which have high thermal stability and specificity, thus improving the accuracy of determining the source results of the target crude oil. This makes it suitable for comparing oil and source rocks at high maturity stages, so as to classify source rocks of different sedimentary facies or rock types in marine strata, thereby providing a basis for the source research of ultra-deep high-temperature oil and gas reservoirs.

[0049] Figure 4 This is a flowchart illustrating another method for determining the source of marine petroleum with different lithologies, provided as an embodiment of the present invention. The technical solution of this embodiment further optimizes the process of determining the target content ratio corresponding to the target crude oil in the aforementioned embodiments, based on the technical solutions of the above embodiments. Schemes not described in detail in this embodiment are found in the above embodiments. This embodiment can be combined with various optional schemes in one or more of the above embodiments.

[0050] like Figure 4 As shown, the method specifically includes:

[0051] S201, Extract Class I and Class II compounds from the target crude oil.

[0052] In this embodiment of the invention, one of the four-cage adamantane compound, five-cage adamantane compound, and six-cage adamantane compound in the target crude oil can be extracted as the first type of compound in the target crude oil, and three-cage adamantane compound in the target crude oil can be extracted as the second type of compound in the target crude oil.

[0053] As an optional embodiment of the present invention, the extraction of a first type of compound from the target crude oil includes the following steps A1-A3:

[0054] Step A1: Separate and enrich soluble saturated hydrocarbons in the target crude oil based on the chromatography column packing and the first solvent. The chromatography column packing is Florisil, and the main component of the first solvent is cyclohexane.

[0055] Step A2: Obtain the chromatographic product of soluble saturated hydrocarbons based on the target chromatography plate and the second solvent under the target environment, which is a saturated vapor environment of isooctane, and the target chromatography plate is covered with C 18 The coated silicon-based thin-layer chromatography plate has silver nitrate as the main component of the second solvent.

[0056] Step A3: Extract the first type of compounds from the target crude oil from the chromatography product using a third solvent, the main component of which is n-hexane.

[0057] Specifically, Florisil can be used as the chromatography column packing material, and cyclohexane solvent can be used as the primary solvent to separate and enrich soluble saturated hydrocarbons in the target crude oil. For example, the column height is not less than 20 cm, and the amount of cyclohexane solvent used is 1.5 times the dead volume of the chromatography column. Furthermore, a C4-coated... 18 A coated silicon-based thin-layer chromatography plate was used as the target chromatography plate. After placing soluble saturated hydrocarbons on the target chromatography plate, the soluble saturated hydrocarbons were soaked and modified using silver nitrate solvent as a second solvent. For example, the mass concentration of the silver nitrate solvent was 0.15 μg / L, and the soaking time was 20 s. Then, the modified soluble saturated hydrocarbons were subjected to chromatography using a saturated vapor environment of isooctane as the target environment to obtain the corresponding chromatographic products. Finally, n-hexane was used as a third solvent to dissolve and extract tetracage-to-hexacage-adamantane series compounds from the chromatographic products, thereby obtaining the first class of compounds in the target crude oil.

[0058] For example, multiple parallel lines of soluble saturated hydrocarbons can be formed on the target chromatography plate. After modification by soaking in silver nitrate solvent, the target chromatography plate is placed vertically along the parallel lines of soluble saturated hydrocarbons in a saturated vapor environment of isooctane for a preset time, and the chromatographic product at the corresponding position on the target chromatography plate can be collected. The preset time can be 12 minutes.

[0059] S202. Determine the content values ​​of Class I compounds and Class II compounds in the target crude oil.

[0060] In this embodiment of the invention, the content value of one of the four-cage adamantane compound, five-cage adamantane compound, and six-cage adamantane compound in the target crude oil can be used as the content value of the first type of compound in the target crude oil, and the content value of the three-cage adamantane compound in the target crude oil can be used as the content value of the second type of compound in the target crude oil. The methods for determining the content value of adamantane compounds in the target crude oil include, but are not limited to, high-performance liquid chromatography, nuclear magnetic resonance spectroscopy, and gas chromatography-mass spectrometry.

[0061] As an optional embodiment of the present invention, determining the content values ​​of the first type of compound and the second type of compound in the target crude oil includes the following steps B1-B2:

[0062] Step B1: Obtain the mass spectra of the first and second class compounds in the target crude oil using a dual mass spectrometry gas chromatography-mass spectrometry instrument.

[0063] Step B2: Determine the content values ​​of Class I compounds and Class II compounds in the target crude oil based on the chromatographic area in the mass spectrum.

[0064] In this embodiment of the invention, the dual-mass gas chromatography-mass spectrometry (DMGC) instrument can refer to an analytical instrument that combines gas chromatography and mass spectrometry. The DMGC instrument separates the first and second classes of compounds in the target crude oil using gas chromatography, and then determines the mass spectra of the first and second classes of compounds using mass spectrometry. Furthermore, based on the baseline of the mass spectrum corresponding to the mass spectrum of the first class of compounds, the mass spectrum of the first class of compounds is integrated to obtain the chromatographic area corresponding to the first class of compounds in the mass spectrum, which is taken as the content value of the first class of compounds in the target crude oil. Similarly, based on the baseline of the mass spectrum corresponding to the mass spectrum of the second class of compounds, the mass spectrum of the second class of compounds is integrated to obtain the chromatographic area corresponding to the second class of compounds in the mass spectrum, which is taken as the content value of the second class of compounds in the target crude oil.

[0065] For example, refer to Figure 5 By referencing the lithofacies type of the source rocks of the crude oil, taking mudstone and carbonate shale as examples, the mass spectra of the target crude oil and the reference crude oil can be obtained sequentially. Figure 5 In the mass spectra of the target crude oil shown, the first row represents the mass spectra when the second category of compounds belongs to the tricrystal adamantane series, and the content of the second category of compounds in the target crude oil can be determined based on the chromatographic area corresponding to the mass spectrum of the second category of compounds. The second to fourth rows represent the mass spectra corresponding to the first category of compounds belonging to the tetracrystal to hexacrystal adamantane series, respectively, and the content of the first category of compounds in the target crude oil can be determined based on the chromatographic area corresponding to the mass spectrum of the first category of compounds. Similarly, the content values ​​of the first category of compounds and the second category of compounds in each reference crude oil can be obtained.

[0066] As an optional embodiment of the present invention, the capillary column configured in the dual mass spectrometry gas chromatography instrument is HP DB-5.

[0067] In this embodiment of the invention, the capillary column configured in the dual mass spectrometry gas chromatography instrument is HP DB-5 (60m×0.32mm×0.1μm) to improve the accuracy of obtaining mass spectra of the first and second class compounds in the target crude oil.

[0068] S203. Determine the target content ratio based on the content values ​​of Class I compounds and Class II compounds in the target crude oil.

[0069] Specifically, the ratio between the content of Class I compounds in the target crude oil and the content of Class II compounds in the target crude oil can be used as the target content ratio of the target crude oil.

[0070] S204. Determine the reference content ratios corresponding to multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compounds and the second type of compounds in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance.

[0071] In this embodiment of the invention, the method for determining the reference content ratio corresponding to each of the multiple reference crude oils can be similar to the method for determining the target content ratio corresponding to the target crude oil.

[0072] S205. The source result of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock to which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock to which the target crude oil originates.

[0073] The technical solution of this invention improves the accuracy of determining the target content ratio by extracting first and second type compounds from the target crude oil, determining the content values ​​of the first and second type compounds in the target crude oil, and determining the target content ratio based on the content values ​​of the first and second type compounds in the target crude oil. It also determines reference content ratios for multiple reference crude oils, each reference content ratio indicating the content ratio between the first and second type compounds in the reference crude oil. Based on the target content ratio and the reference content ratios for the multiple reference crude oils, the source of the target crude oil is determined. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which it originates. The source result of the target crude oil indicates the lithofacies type of the source rock from which it originates. This achieves the determination of the lithofacies type of the source rock from which the target crude oil originates by comparing the target content ratio with multiple reference content ratios. Furthermore, the first and second type compounds belong to the adamantane series, possessing high thermal stability and specificity, which improves the accuracy of determining the source of the target crude oil.

[0074] Figure 6 This is a schematic diagram of a device for determining the source of marine petroleum in different lithologies, provided as an embodiment of the present invention. This embodiment of the present invention is applicable to determining the lithological type of source rocks from crude oil collected in marine strata under different sedimentary environments. The device can be implemented in hardware and / or software.

[0075] like Figure 6 As shown, the device includes:

[0076] The first determining module 301 is used to determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the target crude oil. The target crude oil is a crude oil sample collected from the source rock of the marine strata. The first type of compound belongs to one of the four-cage adamantane series compounds, the five-cage adamantane series compounds, and the six-cage adamantane series compounds. The second type of compound belongs to the three-cage adamantane series compounds.

[0077] The second determining module 302 is used to determine the reference content ratio corresponding to each of the multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance.

[0078] The third determining module 303 is used to determine the source result of the target crude oil based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock from which the target crude oil originates.

[0079] Based on any of the above optional technical solutions, optionally, the sampling amount of the target crude oil and each soluble organic matter shall not be less than 100 mg.

[0080] Based on any of the above-mentioned optional technical solutions, optionally, the first determining module 301 includes: a compound extraction unit, a content value determining unit, and a target content ratio determining unit. The compound extraction unit is used to extract first-class compounds and second-class compounds from the target crude oil; the content value determining unit is used to determine the content values ​​of the first-class compounds and the second-class compounds in the target crude oil; and the target content ratio determining unit is used to determine a target content ratio based on the content values ​​of the first-class compounds and the second-class compounds in the target crude oil.

[0081] Based on any of the above optional technical solutions, optionally, the compound extraction unit includes: a first extraction subunit, a second extraction subunit, and a third extraction subunit. The first extraction subunit is used to separate and enrich soluble saturated hydrocarbons in the target crude oil based on chromatographic column packing and a first solvent. The chromatographic column packing is Florisil, and the main component of the first solvent is cyclohexane. The second extraction subunit is used to obtain the chromatographic product of soluble saturated hydrocarbons based on a target chromatographic plate and a second solvent under a target environment. The target environment is a saturated vapor environment of isooctane, and the target chromatographic plate is covered with C... 18 The coated silicon-based thin-layer chromatography plate has a second solvent whose main component is silver nitrate; the third extraction subunit is used to extract the first type of compounds from the target crude oil from the chromatography product using a third solvent whose main component is n-hexane.

[0082] Based on any of the above-mentioned optional technical solutions, optionally, the content value determination unit includes: a mass spectrum determination subunit and a content value determination subunit. The mass spectrum determination subunit is used to obtain mass spectra of the first and second class compounds in the target crude oil using a dual-mass gas chromatography-mass spectrometry (MS / MS) instrument; the content value determination subunit is used to determine the content values ​​of the first class compounds and the second class compounds in the target crude oil based on the chromatographic areas in the mass spectra.

[0083] Based on any of the above optional technical solutions, the capillary column configured for the dual mass spectrometry gas chromatography instrument can optionally be HP DB-5.

[0084] Based on any of the above optional technical solutions, optionally, the third determining module 303 is specifically used to take the lithofacies type of the source rock of the candidate crude oil associated with the candidate crude oil in multiple reference crude oils as the lithofacies type of the source rock of the target crude oil, and the deviation between the reference content ratio and the target content ratio corresponding to the candidate crude oil is less than the deviation between the reference content ratio and the target content ratio corresponding to the reference crude oil other than the candidate crude oil in the reference crude oil.

[0085] The technical solution of this invention involves: a first determining module 301 determining a target content ratio corresponding to the target crude oil, whereby the target content ratio indicates the content ratio between a first type of compound and a second type of compound in the target crude oil; a second determining module 302 determining reference content ratios corresponding to multiple reference crude oils, where each reference content ratio indicates the content ratio between a first type of compound and a second type of compound in the reference crude oil; and a third determining module 303 determining the source result of the target crude oil based on the target content ratio corresponding to the target crude oil and the reference content ratios corresponding to the multiple reference crude oils, where each reference crude oil is pre-associated with a reference crude oil source. The source rocks of the target crude oil are used to indicate the lithofacies type of the source rocks from which the target crude oil originates. This method achieves the determination of the lithofacies type of the source rocks from which the target crude oil originates by comparing the target content ratio with multiple reference content ratios. Furthermore, the first and second class compounds belong to the adamantane series, which have high thermal stability and specificity, thus improving the accuracy of determining the source of the target crude oil. This makes it suitable for comparing oil and source rocks at high maturity stages, facilitating the classification of source rocks of different sedimentary facies or rock types in marine strata, thereby providing a basis for the study of the source of ultra-deep high-temperature oil and gas reservoirs.

[0086] The apparatus for determining the source of marine petroleum in different lithologies provided in the embodiments of the present invention can execute the method for determining the source of marine petroleum in different lithologies provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method.

[0087] Figure 7 This is a schematic diagram of an electronic device for implementing a method for determining the source of marine petroleum with different lithologies, provided as an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0088] like Figure 7 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0089] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0090] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing unit (CPU), graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as methods for determining the source of marine petroleum in different lithologies.

[0091] In some embodiments, the method for determining the source of oil from different lithologic marine facies can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for determining the source of oil from different lithologic marine facies described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the method for determining the source of oil from different lithologic marine facies by any other suitable means (e.g., by means of firmware).

[0092] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0093] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0094] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0095] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0096] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0097] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0098] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0099] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining the source of marine petroleum with different lithologies, characterized in that, The method includes: Determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the target crude oil. The target crude oil is a crude oil sample collected from the source rock of marine strata. The first type of compound belongs to one of the tetracrystal adamantane series compounds, the pentacrystal adamantane series compounds, and the hexacrystal adamantane series compounds. The second type of compound belongs to the tricrystal adamantane series compounds. A reference content ratio is determined for each of the multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance. The source result of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock from which the target crude oil originates.

2. The method according to claim 1, characterized in that, The sample size of the target crude oil and each soluble organic matter shall be no less than 100 mg.

3. The method according to claim 1, characterized in that, Determine the target content ratio corresponding to the target crude oil, including: Extract the first and second class compounds from the target crude oil; Determine the content values ​​of the first type of compounds and the second type of compounds in the target crude oil; The target content ratio is determined based on the content values ​​of the first type of compound and the second type of compound in the target crude oil.

4. The method according to claim 3, characterized in that, Extracting Class I compounds from the target crude oil, including: Based on the separation and enrichment of soluble saturated hydrocarbons in target crude oil using chromatographic column packing and a first solvent, wherein the chromatographic column packing is Florisil and the main component of the first solvent is cyclohexane; The chromatographic product of the soluble saturated hydrocarbon is obtained in a target environment, which is a saturated vapor environment of isooctane, based on a target chromatography plate and a second solvent. 18 The coated silicon-based thin-layer chromatography plate, wherein the main component of the second solvent is silver nitrate; The first type of compound in the target crude oil is extracted from the chromatography product using a third solvent, the main component of which is n-hexane.

5. The method according to claim 3, characterized in that, Determining the content values ​​of Class I compounds and Class II compounds in the target crude oil includes: Mass spectra of the first and second class compounds in the target crude oil were obtained using a dual mass spectrometry gas chromatography-mass spectrometry instrument. The content values ​​of Class I compounds and Class II compounds in the target crude oil are determined based on the chromatographic area in the mass spectrum.

6. The method according to claim 5, characterized in that, The capillary column configured in the dual mass spectrometry gas chromatography instrument is HP DB-5.

7. The method according to claim 1, characterized in that, The source of the target crude oil is determined based on the target content ratio corresponding to the target crude oil and the reference content ratios corresponding to multiple reference crude oils, including: The lithofacies type of the source rocks of the candidate crude oil associated with the candidate crude oil in multiple reference crude oils is taken as the lithofacies type of the source rocks of the target crude oil. The deviation between the reference content ratio corresponding to the candidate crude oil and the target content ratio is less than the deviation between the reference content ratio corresponding to the reference crude oil other than the candidate crude oil and the target content ratio.

8. An apparatus for determining the source of marine petroleum in different lithologies, characterized in that, The device includes: The first determining module is used to determine the target content ratio corresponding to the target crude oil. The target content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the target crude oil. The target crude oil is a crude oil sample collected from a source rock of a marine stratum. The first type of compound belongs to one of the tetracage adamantane series compounds, the pentacage adamantane series compounds, and the hexacage adamantane series compounds. The second type of compound belongs to the tricage adamantane series compounds. The second determining module is used to determine the reference content ratio corresponding to each of the multiple reference crude oils. Each reference content ratio is used to indicate the content ratio between the first type of compound and the second type of compound in the reference crude oil. The multiple reference crude oils are obtained by extracting soluble organic matter from multiple source rock samples from different rock facies types that have been collected in advance. The third determining module is used to determine the source result of the target crude oil based on the target content ratio corresponding to the target crude oil and the reference content ratio corresponding to each of the multiple reference crude oils. Each reference crude oil is pre-associated with the lithofacies type of the source rock from which the reference crude oil originates. The source result of the target crude oil is used to indicate the lithofacies type of the source rock from which the target crude oil originates.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, which enables the at least one processor to perform the method for determining the source of marine petroleum of different lithologies as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method for determining the source of marine petroleum of different lithologies as described in any one of claims 1-7.

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