Continental shale oil characterization method, device, electronic device and storage medium

Abstract

The present invention provides a method, device, electronic device, and storage medium for characterizing continental shale oil characteristics, relating to the field of petroleum technology. The method comprises: obtaining characteristic data of the first and second dimensions of an aged continental shale sample, and obtaining characteristic data of the first dimension of a fresh continental shale sample; based on the characteristic data of the first and second dimensions of the aged continental shale sample and the characteristic data of the first dimension of the fresh continental shale sample, using cryo-focused ion beam scanning electron microscopy imaging technology, characterizing the fresh continental shale sample to obtain characteristic data of the third dimension of the fresh continental shale sample; the third dimension includes at least one of occurrence characteristics, main controlling factors, and effective oil storage space. The method, device, electronic device, and storage medium for characterizing continental shale oil provided by the present invention can more accurately obtain characteristic data of at least one dimension of the occurrence characteristics, main controlling factors, and effective oil storage space of fresh continental shale.

Description

Technical Field

[0001] The present invention relates to the field of petroleum technology, and in particular to a method, device, electronic equipment and storage medium for characterizing continental shale oil characteristics. Background Art

[0002] The occurrence characteristics, main controlling factors, and effective storage space of shale oil are key to evaluating its resource potential, development difficulty, and economic feasibility. Characterizing these characteristics provides a data foundation for shale oil exploration, development, and production.

[0003] Continental shale oil refers to petroleum resources found in shale formations formed in continental sedimentary environments (such as lakes, rivers, and other terrestrial environments). Compared to marine shale oil (such as North American shale oil), the shale formations in which continental shale oil is located are characterized by multi-source mixing, integrated source and reservoir, overlapping thin layers, overall oil content, and localized enrichment. The complex lithofacies and variable petroleum evolution process make it difficult to characterize the occurrence characteristics, main controlling factors, and effective oil storage space of continental shale oil. When characterizing the characteristics of continental shale oil in related technologies, the characterization results often differ significantly from the actual situation, making it difficult to accurately characterize the characteristics of continental shale oil, thereby limiting its exploration and development.

[0004] Therefore, how to more accurately characterize the characteristics of shale oil is a technical problem that needs to be urgently solved in this field. Summary of the Invention

[0005] The present invention provides a method, device, electronic device and storage medium for characterizing the characteristics of continental shale oil, which are used to solve the defect in the existing technology that it is difficult to accurately characterize the occurrence characteristics, main controlling factors and effective oil storage space of shale oil, and to achieve more accurate characterization of the occurrence characteristics, main controlling factors and effective oil storage space of shale oil.

[0006] The present invention provides a method for characterizing continental shale oil characteristics, comprising the following steps.

[0007] Acquire characteristic data of a first dimension and a second dimension of an aged continental shale sample, and acquire characteristic data of the first dimension of a fresh continental shale sample; the aged continental shale sample is obtained in a target underground area by a pressure-maintained coring technique, and is subsequently placed in a normal temperature and pressure environment for preservation for a first preset time; the fresh continental shale sample is obtained in the target underground area by a pressure-maintained coring technique, and is subsequently placed in a low-temperature environment for preservation for a second preset time, wherein the fresh continental shale sample is isolated from air when stored in the low-temperature environment; the first dimension includes at least one of lithologic type, lithofacies type, and maturity; the second dimension includes at least one of total organic carbon content and / or mineral composition;

[0008] Based on the characteristic data of the first and second dimensions of the aged continental shale sample and the characteristic data of the first dimension of the fresh continental shale sample, the fresh continental shale sample is characterized by using cryo-focused ion beam scanning electron microscope imaging technology to obtain characteristic data of the third dimension of the fresh continental shale sample; the third dimension includes at least one of the occurrence characteristics, main controlling factors and effective oil storage space.

[0009] According to a method for characterizing continental shale oil provided by the present invention, based on the characteristic data of the first and second dimensions of the aged continental shale sample and the characteristic data of the first dimension of the fresh continental shale sample, the method characterizes the fresh continental shale sample using a cryo-focused ion beam scanning electron microscope imaging technique to obtain the characteristic data of the third dimension of the fresh continental shale sample, including:

[0010] Taking a portion of the fresh continental shale sample for slicing, obtaining fresh continental shale sample slices, and obtaining images of the fresh continental shale sample slices;

[0011] Based on the feature data of the first dimension of the fresh continental shale sample, a first regional positioning model corresponding to the fresh continental shale sample is determined, where the first regional positioning model corresponding to the fresh continental shale sample is obtained after training based on the feature data of the second dimension of the sample stored continental shale sample and position information of a first region of interest on a slice of the sample stored continental shale sample, the feature data of the first dimension of the sample stored continental shale sample matches the feature data of the first dimension of the fresh continental shale sample, the stored continental shale sample includes the sample stored continental shale sample, and the slice of the sample stored continental shale sample is obtained by slicing a portion of the sample stored continental shale sample;

[0012] Inputting the image of the fresh continental shale sample slice into a first regional positioning model corresponding to the fresh continental shale sample, and obtaining position information of the first region of interest on the fresh continental shale sample slice output by the first regional positioning model corresponding to the fresh continental shale sample;

[0013] Based on the position information of the first area of ​​interest on the fresh continental shale sample slice, two-dimensional imaging characterization is performed in the first area of ​​interest on the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscope imaging technology, and then the characteristic data of the third dimension of the fresh continental shale sample is obtained based on the two-dimensional imaging characterization result.

[0014] According to a method for characterizing continental shale oil characteristics provided by the present invention, after obtaining the image of the fresh continental shale sample slice, the method further includes:

[0015] Determining, based on the feature data of the first dimension of the fresh continental shale sample, a second region of interest positioning model corresponding to the fresh continental shale sample, wherein the second region of interest positioning model corresponding to the fresh continental shale sample is obtained by training based on the feature data of the second dimension of the sampled continental shale sample and position information of the second region of interest on a slice of the sampled continental shale sample;

[0016] inputting the image of the fresh continental shale sample slice into a second region of interest positioning model corresponding to the fresh continental shale sample, and obtaining position information of the second region of interest on the fresh continental shale sample slice output by the second region of interest positioning model corresponding to the fresh continental shale sample;

[0017] Based on the position information of the second region of interest on the fresh continental shale sample slice, the second region of interest on the fresh continental shale sample slice is subjected to three-dimensional imaging characterization using cryo-focused ion beam scanning electron microscopy imaging technology within the second region of interest on the fresh continental shale sample slice, and then the characteristic data of the third dimension of the fresh continental shale sample is obtained based on the three-dimensional imaging characterization result.

[0018] According to a method for characterizing continental shale oil characteristics provided by the present invention, based on the position information of the first region of interest on the fresh continental shale sample slice, two-dimensional imaging characterization is performed in the first region of interest on the fresh continental shale sample slice using a cryo-focused ion beam scanning electron microscope imaging technique, comprising:

[0019] pre-processing the fresh continental shale sample slice to obtain a pre-processed fresh continental shale sample slice;

[0020] Transferring the pretreated fresh continental shale sample slice into a sample chamber of a cryo-focused ion beam scanning electron microscope in a frozen state, and etching a plurality of two-dimensional fresh surfaces within the first region of interest on the pretreated fresh continental shale sample slice using a focused ion beam at a first temperature;

[0021] Acquiring a scanning electron microscope image of the fresh surface using the cryo-focused ion beam scanning electron microscope as the two-dimensional imaging characterization result, and acquiring chemical composition data of the fresh surface using an energy dispersive spectrometer carried by the cryo-focused ion beam scanning electron microscope as the two-dimensional imaging characterization result;

[0022] The pretreated fresh terrestrial shale sample slices are heated to a second temperature, and a scanning electron microscope is used to obtain a scanning electron microscope image of the fresh surface again at the second temperature as the two-dimensional imaging characterization result. The energy spectrometer equipped with the scanning electron microscope is used to obtain chemical composition data of the fresh surface again as the two-dimensional imaging characterization result.

[0023] According to a method for characterizing continental shale oil characteristics provided by the present invention, based on the position information of the second region of interest on the fresh continental shale sample slice, three-dimensional imaging characterization of the second region of interest on the fresh continental shale sample slice is performed using a cryo-focused ion beam scanning electron microscope imaging technique within the second region of interest on the fresh continental shale sample slice, comprising:

[0024] At the first temperature, a focused ion beam is used to etch a cube of a target size in the second region of interest on the pretreated fresh continental shale sample slice;

[0025] Slicing the cube with a preset thickness using a focused ion beam at the first temperature, obtaining a scanning electron microscope image of each cube slice using the cryo-focused ion beam scanning electron microscope, and obtaining chemical composition data of each cube slice using an energy dispersive spectrometer onboard the cryo-focused ion beam scanning electron microscope, wherein the number of cube slices is a preset number;

[0026] Three-dimensional skeleton modeling is performed based on the scanning electron microscope images of each of the cube slices to obtain a three-dimensional skeleton model of the cube. A pore space structure is generated in the three-dimensional skeleton model of the cube based on the chemical composition data of each of the cube slices to obtain a three-dimensional model of the cube as the three-dimensional imaging characterization result.

[0027] According to a method for characterizing continental shale oil provided by the present invention, the fresh continental shale sample is obtained by the following steps: after obtaining the continental shale sample from the target underground area by pressure-maintaining coring technology, a protective layer for isolating the continental shale sample is coated on the surface of the continental shale sample to isolate the air;

[0028] After the surface of the continental shale sample is coated with the protective layer, the continental shale sample coated with the protective layer is stored in dry ice;

[0029] When the storage time of the continental shale sample coated with the protective layer in dry ice does not exceed the second preset time, the continental shale sample is determined to be the fresh continental shale sample.

[0030] The present invention also provides a device for characterizing continental shale oil, comprising the following modules:

[0031] The present invention also provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements any of the above-described methods for characterizing continental shale oil characteristics.

[0032] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for characterizing continental shale oil characteristics.

[0033] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-described methods for characterizing continental shale oil characteristics.

[0034] The continental shale oil characterization method, device, electronic device and storage medium provided by the present invention preserve fresh continental shale samples obtained by pressure-maintaining coring technology in a low-temperature environment and isolated from air before characterization, thereby maintaining the physical and chemical properties of the fresh continental shale samples as close to their original state as possible, thereby improving the accuracy of subsequent characterization. The method, device, electronic device and storage medium can use the first and second dimensional characteristic data of aged continental shale samples stored at room temperature for a long time to provide data guidance for characterizing the fresh continental shale samples. The high-resolution three-dimensional imaging technology of the cryo-focused ion beam scanning electron microscope can be used to achieve in situ imaging characterization of the fresh continental shale samples, and can more accurately obtain characteristic data of at least one dimension of the occurrence characteristics, main controlling factors and effective oil storage space of the fresh continental shale. This effectively breaks through the data distortion bottleneck caused by sample deterioration in traditional characterization methods, provides a more accurate data basis for the exploration, development and production of shale oil, and has important guiding significance for the formulation of shale oil exploration and development plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a schematic flow chart of the method for characterizing continental shale oil provided by the present invention.

[0037] Figure 2 It is a scanning electron microscope image of a cube obtained by etching in the second region of interest on a slice of a fresh continental shale sample after pretreatment in the continental shale oil characteristic characterization method provided by the present invention.

[0038] Figure 3 It is a structural schematic diagram of the continental shale oil characteristic characterization device provided by the present invention.

[0039] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In the description of this application, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, in the description of this application, "and / or" represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0043] It's important to note that, as oil is at the core of the global energy system, the depletion of conventional crude oil reserves has made the exploration of unconventional oil resources crucial. Shale oil refers to oil resources stored in shale formations, including oil contained in the pores and fractures of mudstone, as well as oil in adjacent layers and interlayers of dense carbonate or clastic rocks within mudstone formations. As an unconventional oil resource, the exploration and development of shale oil is of great significance for optimizing the energy structure and ensuring energy security.

[0044] The occurrence characteristics of shale oil refer to its distribution state, phase state, and interaction with rocks in underground reservoirs. The occurrence characteristics of shale oil mainly include its phase state, distribution characteristics, and occurrence space.

[0045] The controlling factors of shale oil refer to those that have a decisive influence on the formation, enrichment, storage, and production of shale oil. These factors may include, but are not limited to, organic matter characteristics, mineral composition, reservoir properties, temperature and pressure conditions, and tectonic setting.

[0046] The effective storage space of shale oil refers to the pore and fracture system in shale that can store and flow oil and gas. The effective storage space of shale oil mainly includes organic pores, inorganic mineral pores, microfracture networks, and solution voids.

[0047] The occurrence characteristics, main controlling factors and effective oil storage space of shale oil are the key to evaluating the resource potential, development difficulty and economic feasibility of shale oil.

[0048] Conventional methods for characterizing continental shale oil can be performed through physical and chemical characterization techniques (such as rock pyrolysis or nuclear magnetic resonance) or microscopic imaging techniques (such as conventional field emission scanning electron microscopy or focused ion beam scanning electron microscopy). However, when shale, originally exposed to high temperature and high pressure (60-200°C and 10-100 MPa) underground, is cored to the surface (25°C and 101.3 kPa), hydrocarbons in the cored shale sample undergo significant migration and dissipation due to the drastic change in environmental conditions. This makes it difficult to accurately characterize continental shale oil using these physical and chemical characterization techniques.

[0049] Characterizing continental shale samples using microscopic imaging requires imaging the freshly polished surface of the sample under a high vacuum environment. However, liquid hydrocarbons on the freshly polished surface of a shale sample are unstable and easily dissipate in a high vacuum environment. This results in significant discrepancies between the results obtained from microscopic imaging and the actual situation. Therefore, more accurate characterization of shale oil is a pressing technical challenge in this field.

[0050] To address this issue, the present invention provides a method for characterizing continental shale oil. This method innovatively establishes a characterization experimental process for in-situ imaging of continental shale samples, promoting the development of in-situ imaging characterization technology for shale oil. This method has important guiding significance for deepening the understanding of in-situ geological theory of continental shale oil and formulating continental shale oil development strategies.

[0051] The following combination Figure 1-Figure 2 The present invention describes the method for characterizing continental shale oil characteristics.

[0052] Figure 1 Schematic diagram of the process of the continental shale oil characterization method provided by the present invention, such as Figure 1 As shown, the method includes the following:

[0053] Step 101, obtain characteristic data of the first dimension and the second dimension of the aged continental shale sample, and obtain characteristic data of the first dimension of the fresh continental shale sample; the aged continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is placed in a normal temperature and pressure environment for a first preset time after being obtained; the fresh continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is placed in a low-temperature environment for a second preset time after being obtained, and the fresh continental shale sample is isolated from the air when stored in the low-temperature environment; the first dimension includes at least one of lithology type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral composition.

[0054] It should be noted that the embodiment of the present invention is implemented by a device for characterizing continental shale oil characteristics, which can be configured in electronic devices such as computers or servers.

[0055] Specifically, fresh continental shale samples are the subject of the continental shale oil characterization method provided by the present invention. Based on the continental shale oil characterization method provided by the present invention, characteristic data of the third dimension of the fresh continental shale samples can be obtained.

[0056] It should be noted that the first preset duration and the second preset duration in the two embodiments of the present invention can be determined based on prior knowledge and / or actual circumstances. For example, the first preset duration can range from 80 to 100 days; the second preset duration can range from 6 to 8 days. The specific values ​​of the first preset duration and the second preset duration are not limited in the embodiments of the present invention.

[0057] It should be noted that the normal temperature and pressure environment in the embodiments of the present invention refers to an environment with room temperature (25°C) and atmospheric pressure (101.3 kPa). The temperature of the low-temperature environment in the embodiments of the present invention can be determined based on prior knowledge and / or actual conditions, and the embodiments of the present invention do not specifically limit the temperature of the low-temperature environment.

[0058] It can be understood that in the embodiment of the present invention, the number of the aged continental shale samples is multiple, and the number of the fresh continental shale samples can be one or more.

[0059] As an optional embodiment, a fresh continental shale sample is obtained by the following steps: after obtaining the continental shale sample from the target underground area by pressure-maintaining coring technology, a protective layer for isolating the continental shale sample is coated on the surface of the continental shale sample.

[0060] It should be noted that pressure-maintained coring is a drilling coring technique that maintains or approaches the original formation pressure during the coring process. It is primarily used to obtain underground core samples and ensure that fluid components such as oil, gas, and water in the core are not lost during the coring process, thereby accurately reflecting the original formation state. When obtaining core samples using pressure-maintained coring, pressure compensation devices (such as high-pressure gas chambers and regulating valves) maintain the formation pressure within the core during the coring process, preventing the escape of gas and light components from the core due to pressure drop. A sealing fluid (such as calcium carbonate or calcium bromide) is applied to the core surface to prevent drilling fluid contamination. A ball valve seals the core barrel after coring, ensuring the core remains sealed during the drill jacking process. During the pull-out process, high-pressure nitrogen or inert gas is used to replenish pressure within the core barrel to maintain a constant internal pressure, ensuring that the core remains at the original formation pressure before surface processing.

[0061] It should be noted that the target underground area in the embodiment of the present invention can be determined based on actual needs. The target underground area in the embodiment of the present invention is not specifically limited.

[0062] It can be understood that the aged continental shale samples and the fresh continental shale samples in the embodiments of the present invention are continental shale samples taken from the same underground area but with different preservation methods and preservation times.

[0063] After obtaining the continental shale sample from the target underground area by the pressure-maintaining coring technology, a protective layer for isolating the air may be coated on the surface of the continental shale sample within a third preset time period.

[0064] It should be noted that the third preset duration in the embodiment of the present invention can be determined based on prior knowledge and / or actual conditions. For example, the value range of the third preset duration can be 20 seconds to 40 seconds. The specific value of the third preset duration is not limited in the embodiment of the present invention.

[0065] Optionally, the protective layer used to coat the continental shale sample in the embodiment of the present invention may be a polyethylene film, a paraffin film, a polyvinyl chloride film or a polyester film, as well as a paraffin coating or a silicone coating.

[0066] After the surface of the continental shale sample is coated with a protective layer, the continental shale sample coated with the protective layer is stored in dry ice.

[0067] Specifically, after the surface of the above-mentioned continental shale sample is coated with a protective layer for isolating the space, the above-mentioned continental shale sample coated with the protective layer can be placed in a low-temperature freezer containing dry ice within the fourth preset time period, and then the continental shale sample in a low-temperature environment can be transported to the laboratory under cold chain conditions.

[0068] It should be noted that the fourth preset duration in the embodiment of the present invention can be determined based on prior knowledge and / or actual conditions. For example, the value range of the fourth preset duration can be 20 seconds to 40 seconds. The specific value of the fourth preset duration is not limited in the embodiment of the present invention.

[0069] It is understandable that the sublimation temperature of dry ice is -78.5°C. Therefore, when the continental shale sample coated with the protective layer in the embodiment of the present invention is stored in a low-temperature environment, the temperature of the low-temperature environment is -78.5°C.

[0070] When the storage time of the continental shale sample coated with the protective layer in the dry ice does not exceed the second preset time, the continental shale sample is determined to be a fresh continental shale sample.

[0071] It should be noted that the storage time of the above-mentioned continental shale sample coated with the protective layer in dry ice is counted from the moment when the above-mentioned continental shale sample coated with the protective layer is placed in the dry ice.

[0072] As an optional embodiment, the stored continental shale sample is obtained by the following steps: after obtaining the continental shale sample from the target underground area using a pressure-maintained coring technique, the continental shale sample is stored in an environment at room temperature and pressure. If the continental shale sample is stored in the environment at room temperature and pressure for a period exceeding a first preset period, the continental shale sample is determined to be a stored continental shale sample.

[0073] It should be noted that the storage time of the above-mentioned continental shale samples in a normal temperature and pressure environment is counted from the moment when the above-mentioned continental shale samples are in the normal temperature and pressure environment.

[0074] In the embodiment of the present invention, characteristic data of the first dimension and the second dimension of the Chenzhi terrestrial shale sample can be obtained by testing and analyzing some samples of the Chenzhi terrestrial shale sample.

[0075] It should be noted that the total organic carbon content (TOC) in this embodiment refers to the richness of organic matter in shale and is generally proportional to the oil and gas potential of the shale. Maturity reflects the degree of thermal evolution of the shale, with higher maturity generally indicating a higher oil and gas generation potential. Mineral composition can influence the pore structure and oil and gas occurrence of shale. Lithologic classifications, including mudstone and shale, influence the occurrence and distribution of oil and gas in shale. Shales with different lithofacies classifications have different pore characteristics and oil and gas storage capacities.

[0076] Specifically, some samples of the Chenzhi terrestrial shale samples can be taken for geochemical analysis, including rock pyrolysis, total organic carbon (TOC) measurement, and vitrinite reflectance (Ro) analysis tests, to obtain the total organic carbon content and maturity of the Chenzhi terrestrial shale samples.

[0077] Some samples of the Chenzhi continental shale samples can also be taken for petrological and mineralogical characteristic analysis to determine the lithofacies type of the Chenzhi continental shale samples.

[0078] It is also possible to take part of the sample from the Chenzhi continental shale sample and slice it to obtain a 20 mm thick The thin sections of the Chenzhi continental shale samples were analyzed using a Zeiss Axio Scope A2 polarizing microscope to determine the lithologic type of the Chenzhi continental shale samples and to distinguish whether the Chenzhi continental shale samples were coarse-grained siltstone or fine-grained shale (the mineral particle size of coarse-grained siltstone is greater than 62.5). ).

[0079] The mineral composition of the Chenzhi continental shale sample can be obtained by testing the thin section of the Chenzhi continental shale sample using X-ray diffraction (XRD) technology.

[0080] It should be noted that by conducting quantitative separation of group composition and chromatographic analysis of saturated hydrocarbons on the crude oil produced in the target underground area, characteristic data such as the chemical composition of the crude oil produced in the target underground area, the type of crude oil, the fluidity and processing properties of the crude oil, the molecular composition of saturated hydrocarbons in the crude oil, the maturity of the crude oil, the degree of biodegradation of the crude oil, the source of organic matter, and the characteristics of the sedimentary environment can be obtained.

[0081] It should be noted that when the above-mentioned aged continental shale samples are obtained by pressure-maintaining coring technology, the volatilized gas can be collected and then analyzed using headspace-gas chromatography-mass spectrometry (HS-GC-MS) to obtain the composition of volatile hydrocarbons in the above-mentioned aged continental shale samples.

[0082] In the embodiment of the present invention, characteristic data of the first dimension of the fresh continental shale samples can be obtained by testing and analyzing some of the fresh continental shale samples.

[0083] It should be noted that the method for obtaining the characteristic data of the first dimension of a fresh continental shale sample is the same as the method for obtaining the characteristic data of the first dimension of an aged continental shale sample, and will not be repeated in the embodiments of the present invention.

[0084] Step 102: Based on the characteristic data of the first and second dimensions of the aged continental shale samples and the characteristic data of the first dimension of the fresh continental shale samples, the fresh continental shale samples are characterized by using cryo-focused ion beam scanning electron microscopy imaging technology to obtain characteristic data of the third dimension of the fresh continental shale samples; the third dimension includes at least one of the occurrence characteristics, main controlling factors and effective oil storage space.

[0085] It should be noted that cryo-focused ion beam scanning electron microscopy (Cryo-FIB-SEM) is an advanced technology that combines cryogenic freezing, focused ion beam (FIB) cutting and scanning electron microscopy (SEM) imaging. It is mainly used for high-resolution three-dimensional imaging of samples in a near-natural state.

[0086] After obtaining the characteristic data of the first and second dimensions of the aged continental shale samples and the characteristic data of the first dimension of the fresh continental shale samples, the characteristic data of the first and second dimensions of the aged continental shale samples and the characteristic data of the first dimension of the fresh continental shale samples can be characterized by using cryo-focused ion beam scanning electron microscope imaging technology, through at least one of numerical calculation, mathematical statistics, conditional judgment and deep learning technology, to obtain the characteristic data of the third dimension of the fresh continental shale samples.

[0087] The embodiment of the present invention preserves the fresh continental shale samples obtained by the pressure-maintaining coring technology in a low-temperature environment and isolated from air before characterization, thereby maintaining the physical and chemical properties of the fresh continental shale samples as close to their original state as possible, thereby improving the accuracy of subsequent characterization. The first and second dimensional characteristic data of the aged continental shale samples stored at room temperature for a long time can be used to provide data guidance for the characterization of the fresh continental shale samples. The high-resolution three-dimensional imaging technology of the cryo-focused ion beam scanning electron microscope can be used to realize in situ imaging characterization of the fresh continental shale samples. The characteristic data of at least one dimension of the occurrence characteristics, main controlling factors and effective oil storage space of the fresh continental shale can be more accurately obtained, effectively breaking through the data distortion bottleneck caused by sample deterioration in traditional characterization methods, providing a more accurate data basis for the exploration, development and production of shale oil, and having important guiding significance for the formulation of shale oil exploration and development plans.

[0088] As an optional embodiment, based on the characteristic data of the first and second dimensions of the aged continental shale samples and the characteristic data of the first dimension of the fresh continental shale samples, the fresh continental shale samples are characterized by using cryo-focused ion beam scanning electron microscope imaging technology to obtain the characteristic data of the third dimension of the fresh continental shale samples, including: taking part of the fresh continental shale samples for slicing, obtaining fresh continental shale sample slices, and obtaining images of the fresh continental shale sample slices.

[0089] Specifically, in an embodiment of the present invention, part of a fresh continental shale sample can be taken and mechanically crushed and sliced ​​in a liquid nitrogen freezing environment (-196°C), so as to obtain a fresh continental shale sample slice with a length × width × thickness of approximately 5 mm × 5 mm × 1 mm.

[0090] Similarly, the slices of the Chenzhi terrestrial shale samples in the embodiment of the present invention are also obtained by mechanically crushing and slicing part of the Chenzhi terrestrial shale samples in a liquid nitrogen freezing environment (-196°C), and the size of the Chenzhi terrestrial shale sample slices is also about 5mm×5mm×1mm.

[0091] It can be understood that in the embodiment of the present invention, the number of fresh continental shale sample slices is multiple, and the number of aged continental shale sample slices is also multiple.

[0092] After obtaining the fresh continental shale sample slices and the aged continental shale sample slices, the fresh continental shale sample slices and the aged continental shale sample slices are both frozen and stored in liquid nitrogen.

[0093] After obtaining the fresh continental shale sample slice, an imaging device such as an optical microscope, a scanning electron microscope or a field microscope may be used to obtain an image of the fresh continental shale sample slice.

[0094] It should be noted that the images of the slices of the aged continental shale samples were obtained using the same imaging equipment as that used to obtain the images of the slices of the fresh continental shale samples.

[0095] It should be noted that the first region of interest in the embodiment of the present invention is an area on the continental shale sample slice that is suitable for two-dimensional imaging and the second region of interest in the embodiment of the present invention is an area on the continental shale sample slice that is suitable for three-dimensional imaging.

[0096] Accordingly, after obtaining the image of the Chenzhi terrestrial shale sample slice, the key features in the image of the Chenzhi terrestrial shale sample slice, such as porosity, pore morphology, mineral distribution, micro-fracture characteristics and spatial structure characteristics, can be obtained based on the image of the Chenzhi terrestrial shale sample slice. Then, based on the key features in the image of the Chenzhi terrestrial shale sample slice, an algorithm can be used to select an area with a higher total organic carbon content, better maturity and good pore structure in the image of the above-mentioned Chenzhi terrestrial shale sample slice, and an area suitable for two-dimensional imaging, as the first area of ​​interest, and an area with a higher total organic carbon content, better maturity and good pore structure, and suitable for three-dimensional imaging, as the second area of ​​interest. Then, based on the position information of the first area of ​​interest and the second area of ​​interest in the image of the above-mentioned Chenzhi terrestrial shale sample slice, and the mapping relationship between the image of the above-mentioned Chenzhi terrestrial shale sample slice and the above-mentioned Chenzhi terrestrial shale sample slice, the position information of the first area of ​​interest and the position information of the second area of ​​interest in the above-mentioned Chenzhi terrestrial shale sample slice can be obtained.

[0097] Based on the characteristic data of the first dimension of the fresh continental shale sample, the first regional positioning model corresponding to the fresh continental shale sample is determined. The first regional positioning model corresponding to the fresh continental shale sample is obtained after training based on the characteristic data of the second dimension of the sample Chenzhi continental shale sample and the position information of the first area of ​​interest on the slice of the sample Chenzhi continental shale sample. The characteristic data of the first dimension of the sample Chenzhi continental shale sample matches the characteristic data of the first dimension of the fresh continental shale sample. The Chenzhi continental shale sample includes the sample Chenzhi continental shale sample. The slice of the sample Chenzhi continental shale sample is obtained by slicing part of the sample Chenzhi continental shale sample.

[0098] It should be noted that, in the embodiment of the present invention, the Chenzhi terrestrial shale samples can be grouped based on the characteristic data of the first dimension of the Chenzhi terrestrial shale samples, and the Chenzhi terrestrial shale samples with the same lithologic type can be grouped together, the Chenzhi terrestrial shale samples with the same lithologic type can be grouped together, and the Chenzhi terrestrial shale samples with maturity belonging to the same preset maturity range can be grouped together to obtain multiple first-level Chenzhi terrestrial shale sample groups.

[0099] The preset maturity intervals may be determined based on prior knowledge and / or actual conditions, and may include multiple preset maturity intervals. For example, the preset maturity intervals may include [0.5%, 1.5%) and [1.5%, 2.5%). The embodiments of the present invention do not specifically limit the preset maturity intervals.

[0100] It should be noted that the stored continental shale samples included in different first-level stored continental shale sample groups can be repeated.

[0101] After obtaining multiple first-level terrestrial shale sample groups, each first-level terrestrial shale sample group can be arranged and combined, and each combination of multiple first-level terrestrial shale sample groups can be determined as a second-level terrestrial shale sample group, thereby obtaining a second-level terrestrial shale sample group with the same lithofacies type and the same lithologic type, a second-level terrestrial shale sample group with the same lithofacies type and maturity belonging to the same preset maturity range, a second-level terrestrial shale sample group with the same lithologic type and maturity belonging to the same preset maturity range, and a second-level terrestrial shale sample group with the same lithofacies type, the same lithologic type and maturity belonging to the same preset maturity range.

[0102] For each first-level Chenzhi terrestrial shale sample group, the feature data of the second dimension of the Chenzhi terrestrial shale samples in the above-mentioned first-level Chenzhi terrestrial shale sample group can be used as training samples, and the position information of the first area of ​​interest on the Chenzhi terrestrial shale sample slices of the Chenzhi terrestrial shale samples in the above-mentioned first-level Chenzhi terrestrial shale sample group can be used as sample labels to train the first initial model to obtain the first regional positioning model corresponding to the above-mentioned first-level Chenzhi terrestrial shale sample group.

[0103] For each secondary Chenzhi terrestrial shale sample group, the feature data of the second dimension of each Chenzhi terrestrial shale sample in the above-mentioned secondary Chenzhi terrestrial shale sample group can be used as a training sample, and the position information of the first area of ​​interest on the Chenzhi terrestrial shale sample slice of each Chenzhi terrestrial shale sample in the above-mentioned secondary Chenzhi terrestrial shale sample group can be used as a sample label to train the first initial model to obtain the first regional positioning model corresponding to the above-mentioned secondary Chenzhi terrestrial shale sample group.

[0104] It should be noted that the first initial model in the embodiment of the present invention can be constructed based on a supervised learning algorithm, such as a support vector machine (SVM), a random forest (RF) and an artificial neural network (ANN). The first initial model in the embodiment of the present invention can also be constructed based on a deep learning algorithm, such as a convolutional neural network (CNN) or a generative adversarial network (GANs).

[0105] After obtaining the characteristic data of the first dimension of the fresh continental shale sample, a first-level aged continental shale sample group or a second-level aged continental shale sample group whose characteristic data of the first dimension of the included aged continental shale sample matches the characteristic data of the first dimension of the fresh continental shale sample can be selected as the aged continental shale sample group corresponding to the fresh continental shale sample, and the first regional positioning model corresponding to the aged continental shale sample group corresponding to the fresh continental shale sample is determined as the first regional positioning model corresponding to the fresh continental shale sample group, and the aged continental shale sample in the aged continental shale sample group corresponding to the fresh continental shale sample is determined as the sample aged continental shale sample.

[0106] It can be understood that the characteristic data of the first dimension of the aged continental shale sample matches the characteristic data of the first dimension of the fresh continental shale sample.

[0107] It should be noted that the conditions for determining whether the characteristic data of the first dimension of a fresh continental shale sample matches the characteristic data of the first dimension of an aged continental shale sample include: the lithofacies type of the fresh continental shale sample is the same as that of the aged continental shale sample; the lithologic type of the fresh continental shale sample is the same as that of the aged continental shale sample; and the maturity of the fresh continental shale and the aged continental shale sample fall within at least one of the same preset maturity ranges. The specific contents of the above conditions correspond one-to-one to the data dimensions included in the first dimension.

[0108] For example, in the case where the first dimension includes lithologic type or lithofacies type, if the lithofacies type of the fresh continental shale sample is the same as the lithofacies type of the aged continental shale sample, or if the lithologic type of the fresh continental shale is the same as the lithologic type of the aged continental shale sample, it can be determined that the characteristic data of the first dimension of the fresh continental shale sample matches the characteristic data of the first dimension of the aged continental shale sample.

[0109] For another example, when the first dimension includes lithologic type, lithofacies type and maturity, if the lithofacies type of the fresh continental shale sample is the same as the lithofacies type of the aged continental shale sample, and the maturity of the fresh continental shale and the maturity of the aged continental shale sample belong to the same preset maturity range, the maturity of the fresh continental shale and the maturity of the aged continental shale sample belong to the same preset maturity range.

[0110] The image of the fresh continental shale sample slice is input into the first regional positioning model corresponding to the fresh continental shale sample, and the position information of the first area of ​​interest on the fresh continental shale sample slice output by the first regional positioning model corresponding to the fresh continental shale sample is obtained.

[0111] Specifically, after determining the first regional positioning model corresponding to the fresh continental shale sample, the image of the fresh continental shale sample slice can be input into the first regional positioning model corresponding to the fresh continental shale sample. The first regional positioning model corresponding to the fresh continental shale sample can extract key features such as porosity, pore morphology, mineral distribution, micro-crack characteristics and spatial structure characteristics in the image of the fresh continental shale sample slice. Based on the above key features in the image of the fresh continental shale sample slice, the first region of interest can be determined in the image of the fresh continental shale sample slice. Based on the mapping relationship between the image of the fresh continental shale sample slice and the fresh continental shale sample slice, the position information of the first region of interest on the fresh continental shale sample slice can be obtained and output.

[0112] Based on the position information of the first area of ​​interest on the fresh continental shale sample slice, two-dimensional imaging characterization is performed in the first area of ​​interest on the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscopy imaging technology, and then the third-dimensional characteristic data of the fresh continental shale sample is obtained based on the two-dimensional imaging characterization results.

[0113] Specifically, after obtaining the position information of the first area of ​​interest on the fresh continental shale sample slice output by the first area positioning model corresponding to the fresh continental shale sample, two-dimensional imaging characterization can be performed in the first area of ​​interest of the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscope imaging technology, and one or more two-dimensional imaging characterization results can be obtained. Based on the above two-dimensional imaging characterization results, the third-dimensional characteristic data of the fresh continental shale sample can be obtained through numerical calculation, mathematical statistics, and deep learning technology.

[0114] As an optional embodiment, based on the position information of the first area of ​​interest on the fresh continental shale sample slice, two-dimensional imaging characterization is performed in the first area of ​​interest on the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscope imaging technology, including: preprocessing the fresh continental shale sample slice to obtain the preprocessed fresh continental shale sample slice.

[0115] Specifically, a fresh continental shale sample slice was securely mounted on the sample stage of a cryo-focused ion beam scanning electron microscope using mechanical clamps. The sample stage carrying the fresh continental shale sample slice was cryo-transferred to a Leica EM VCT500 vacuum cryo-transfer system, where it was stably frozen at liquid nitrogen temperatures. Subsequently, the fresh continental shale sample slice was transferred via the cryo-transfer chamber of the Leica EM VCT500 vacuum cryo-transfer system to a Leica EM ACE200 cryo-coating system. After sublimation to -90°C for approximately 5 minutes in the Leica EM ACE200 cryo-coating system to remove ice from the surface of the fresh continental shale sample slice, the fresh continental shale sample slice was electroplated with a 5 nm thick layer of tungsten to enhance electrical conductivity, resulting in a pretreated fresh continental shale sample slice.

[0116] The pretreated fresh continental shale sample slice is transferred into the sample chamber of a cryo-focused ion beam scanning electron microscope in a frozen state, and a focused ion beam is used to etch multiple two-dimensional fresh surfaces in a first area of ​​interest on the pretreated fresh continental shale sample slice at a first temperature.

[0117] Optionally, in the embodiment of the present invention, the first temperature may be in the range of -130°C to -170°C.

[0118] Preferably, in the embodiment of the present invention, the value of the first temperature may be -150°C.

[0119] A cryo-focused ion beam scanning electron microscope was used to obtain scanning electron microscope images of the fresh surface as a two-dimensional imaging characterization result, and an energy spectrometer equipped with the cryo-focused ion beam scanning electron microscope was used to obtain chemical composition data of the fresh surface as a two-dimensional imaging characterization result.

[0120] The pretreated fresh terrestrial shale sample slices are heated to a second temperature, and a scanning electron microscope is used to obtain a scanning electron microscope image of the fresh surface again at the second temperature as a two-dimensional imaging characterization result. The energy spectrometer equipped with the scanning electron microscope is used to obtain the chemical composition data of the fresh surface again as a two-dimensional imaging characterization result.

[0121] Optionally, the first temperature in the embodiment of the present invention is the same as the normal temperature mentioned above, and the first temperature may be 25°C.

[0122] The embodiment of the present invention uses multi-dimensional data such as lithology, lithofacies, total organic carbon content, and mineral composition of aged continental shale samples to train a regional positioning model, and combines it with lithology matching information of fresh continental shale samples to determine a first regional positioning model corresponding to the fresh continental shale sample. This allows for rapid and accurate identification of a first region of interest on a slice of the fresh continental shale sample. High-resolution two-dimensional imaging of the first region of interest on the slice of the fresh continental shale sample is performed using a cryo-focused ion beam scanning electron microscope. This overcomes the problem of fresh continental shale samples being susceptible to environmental interference, leading to microstructural distortion. When characterizing the fresh continental shale samples, not only is the original pore-fracture network and organic matter occurrence state of the shale completely preserved, but cross-sample data correlation also reveals the influence of preservation conditions on microscopic characteristics. Ultimately, the method achieves characterization of at least one key dimension of the fresh continental shale sample, providing microscopic data support that is closer to actual underground conditions for shale oil reservoir evaluation, significantly improving the scientificity and reliability of exploration and development decisions.

[0123] As an optional embodiment, after obtaining an image of a fresh continental shale sample slice, the method further includes: determining a second region of interest positioning model corresponding to the fresh continental shale sample based on the characteristic data of the first dimension of the fresh continental shale sample, wherein the second region of interest positioning model corresponding to the fresh continental shale sample is obtained after training based on the characteristic data of the second dimension of the sampled continental shale sample and the position information of the second region of interest on the sampled continental shale sample slice.

[0124] It should be noted that after obtaining each first-level Chenzhi terrestrial shale sample group and each second-level output value terrestrial shale sample group, for each first-level Chenzhi terrestrial shale sample group, the characteristic data of the second dimension of the Chenzhi terrestrial shale samples in the above-mentioned first-level Chenzhi terrestrial shale sample group can be used as training samples, and the position information of the second area of ​​interest on the Chenzhi terrestrial shale sample slices of the Chenzhi terrestrial shale samples in the above-mentioned first-level Chenzhi terrestrial shale sample group can be used as sample labels to train the second initial model to obtain the second area of ​​interest positioning model corresponding to the above-mentioned first-level Chenzhi terrestrial shale sample group.

[0125] For each secondary Chenzhi terrestrial shale sample group, the characteristic data of the second dimension of each Chenzhi terrestrial shale sample in the above-mentioned secondary Chenzhi terrestrial shale sample group can be used as a training sample, and the position information of the second area of ​​interest on the Chenzhi terrestrial shale sample slice of each Chenzhi terrestrial shale sample in the above-mentioned secondary Chenzhi terrestrial shale sample group can be used as a sample label to train the second initial model to obtain the second area of ​​interest positioning model corresponding to the above-mentioned secondary Chenzhi terrestrial shale sample group.

[0126] It should be noted that the second initial model in the embodiment of the present invention can be constructed based on a supervised learning algorithm, such as support vector machine (SVM), random forest (RF) and artificial neural network (ANN). The human initial model in the embodiment of the present invention can also be constructed based on a deep learning algorithm, such as convolutional neural network (CNN) or generative adversarial network (GANs).

[0127] After determining the aged terrestrial shale sample group corresponding to the fresh terrestrial shale sample, the second region of interest positioning model corresponding to the aged terrestrial shale sample group corresponding to the fresh terrestrial shale sample can be determined as the second region of interest positioning model corresponding to the fresh terrestrial shale sample group.

[0128] The image of the fresh continental shale sample slice is input into the second region of interest positioning model corresponding to the fresh continental shale sample, and the position information of the second region of interest on the fresh continental shale sample slice output by the second region of interest positioning model corresponding to the fresh continental shale sample is obtained.

[0129] Specifically, after determining the second region of interest positioning model corresponding to the fresh continental shale sample, the image of the fresh continental shale sample slice can be input into the second region of interest positioning model corresponding to the fresh continental shale sample. The second region of interest positioning corresponding to the fresh continental shale sample can extract key features such as porosity, pore morphology, mineral distribution, microscopic fracture characteristics and spatial structure characteristics in the image of the fresh continental shale sample slice. Based on the above key features in the image of the fresh continental shale sample slice, the second region of interest can be determined in the image of the fresh continental shale sample slice. Based on the mapping relationship between the image of the fresh continental shale sample slice and the fresh continental shale sample slice, the position information of the second region of interest on the fresh continental shale sample slice can be obtained and output.

[0130] Based on the position information of the second area of ​​interest on the fresh continental shale sample slice, the second area of ​​interest on the fresh continental shale sample slice is characterized by three-dimensional imaging using cryo-focused ion beam scanning electron microscopy imaging technology, and then the third-dimensional characteristic data of the fresh continental shale sample is obtained based on the three-dimensional imaging characterization results.

[0131] Specifically, after obtaining the position information of the second area of ​​interest on the fresh continental shale sample slice output by the first regional positioning model corresponding to the fresh continental shale sample, three-dimensional imaging characterization can be performed in the second area of ​​interest of the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscope imaging technology, and one or more three-dimensional imaging characterization results can be obtained. Based on the above three-dimensional imaging characterization results, the third-dimensional feature data of the fresh continental shale sample can be obtained through numerical calculation, mathematical statistics, image processing, feature fusion and deep learning technology.

[0132] As an optional embodiment, based on the position information of the second region of interest on the fresh continental shale sample slice, the second region of interest on the fresh continental shale sample slice is subjected to three-dimensional imaging characterization using cryo-focused ion beam scanning electron microscopy imaging technology within the second region of interest on the fresh continental shale sample slice, including: using a focused ion beam at a first temperature to etch a cube of a target size within the second region of interest on the pretreated fresh continental shale sample slice.

[0133] It should be noted that the target size in the embodiment of the present invention can be determined based on prior knowledge and / or actual conditions. .

[0134] Figure 2The scanning electron microscope image of the cube is obtained by etching the second region of interest on the pre-treated fresh continental shale sample slice in the continental shale oil characterization method provided by the present invention. The cube of the target size is as follows. Figure 2 shown.

[0135] The cube is sliced ​​with a preset thickness using a focused ion beam at a first temperature, a scanning electron microscope image of each cube slice is obtained using a cryo-focused ion beam scanning electron microscope, and chemical composition data of each cube slice is obtained using an energy spectrometer equipped with the cryo-focused ion beam scanning electron microscope. The number of cube slices is a preset number.

[0136] Specifically, the cube is sliced ​​at a preset thickness at a first temperature, and each time a cube slice is obtained, a scanning electron microscope image of the cube slice is obtained using a cryo-focused ion beam scanning electron microscope, and the chemical composition data of the cube slice is obtained using an energy spectrometer equipped with the cryo-focused ion beam scanning electron microscope.

[0137] It should be noted that the preset thickness in the embodiment of the present invention may be determined based on prior knowledge and / or actual conditions. For example, the value range of the preset thickness may be 5 to 9 In the embodiment of the present invention, there is no limitation on the specific value of the preset thickness.

[0138] Optionally, the value of the preset thickness can be 7 .

[0139] When the number of cube slices obtained by slicing reaches a preset number, slicing is terminated. The preset number may be in the range of 600 to 800.

[0140] Optionally, the value of the above preset number may be 700.

[0141] It is understood that the size of the above cube slice is 9 ×6 .

[0142] Three-dimensional skeleton modeling is performed based on the scanning electron microscope images of each cube slice to obtain a three-dimensional skeleton model of the cube. A pore space structure is generated in the three-dimensional skeleton model of the cube based on the chemical composition data of each cube slice to obtain a three-dimensional model of the cube as a three-dimensional imaging characterization result.

[0143] Specifically, the scanning electron microscope images of each cube slice are imported into Avizo software to perform three-dimensional skeleton structure modeling, thereby obtaining a three-dimensional skeleton model of the cube.

[0144] Based on the imaging grayscale differences and the chemical composition data of each cube slice, threshold segmentation technology is used to distinguish and render the inorganic minerals, solid organic matter, liquid hydrocarbons and various types of pore space structures developed in situ in the shale in the three-dimensional skeleton model of the above cube. The three-dimensional model of the above cube can be obtained as the three-dimensional imaging representation result.

[0145] The embodiment of the present invention uses multi-dimensional data such as lithology, lithofacies, total organic carbon content and mineral composition of aged continental shale samples to train a regional positioning model, and combines it with lithology matching information of fresh continental shale samples to determine a second region of interest positioning model corresponding to the fresh continental shale sample. This can achieve rapid and accurate identification of the second region of interest on the fresh continental shale sample slice, and use a cryo-focused ion beam scanning electron microscope to perform three-dimensional tomographic imaging of the first region of interest on the fresh continental shale sample slice. This can overcome the limitations of two-dimensional imaging characterization of information such as pore connectivity and fracture spatial distribution, preserve the three-dimensional structural data of the fresh continental shale sample in its original state, and better reveal the three-dimensional characteristics of nanopore distribution, fracture extension law and organic matter occurrence form in the fresh continental shale sample. Ultimately, it achieves the characteristic characterization of at least one key dimension of the fresh continental shale sample, providing microscopic data support that is closer to the actual underground conditions for shale oil reservoir evaluation, and greatly improving the scientificity and reliability of exploration and development decisions.

[0146] Figure 3 This is a schematic diagram of the structure of the continental shale oil characterization device provided by the present invention. Figure 3 The continental shale oil characteristic characterization device provided by the present invention is described. The continental shale oil characteristic characterization device described below and the continental shale oil characteristic characterization method provided by the present invention described above can be referred to each other. Figure 3 As shown, the device includes: a data acquisition module 301 and a feature characterization module 302.

[0147] The data acquisition module 301 is used to obtain characteristic data of the first dimension and the second dimension of the aged continental shale sample, and obtain characteristic data of the first dimension of the fresh continental shale sample; the aged continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is stored in a normal temperature and pressure environment for more than a first preset time after being obtained; the fresh continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is stored in a low-temperature environment for no more than a second preset time after being obtained, and the fresh continental shale sample is isolated from air when stored in the low-temperature environment; the first dimension includes at least one of lithology type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral composition;

[0148] The feature characterization module 302 is used to characterize the fresh continental shale samples based on the feature data of the first and second dimensions of the aged continental shale samples and the feature data of the first dimension of the fresh continental shale samples using cryo-focused ion beam scanning electron microscope imaging technology to obtain feature data of the third dimension of the fresh continental shale samples; the third dimension includes at least one of the occurrence characteristics, main controlling factors and effective oil storage space.

[0149] Specifically, the data acquisition module 301 and the feature characterization module 302 are electrically connected.

[0150] The continental shale oil characteristic characterization device in the embodiment of the present invention preserves the fresh continental shale samples obtained by the pressure-maintaining coring technology in a low-temperature environment under air-tight conditions before characteristic characterization, thereby maintaining the physical and chemical properties of the fresh continental shale samples as close to their original state as possible, thereby improving the accuracy of subsequent characteristic characterization. It can use the first-dimensional and second-dimensional characteristic data of the aged continental shale samples stored at room temperature for a long time to provide data guidance for the characteristic characterization of the fresh continental shale samples. It can use the high-resolution three-dimensional imaging technology of the cryo-focused ion beam scanning electron microscope to achieve in-situ imaging characterization of the fresh continental shale samples, and can more accurately obtain the characteristic data of at least one dimension of the occurrence characteristics, main controlling factors and effective oil storage space of the fresh continental shale. It effectively breaks through the data distortion bottleneck caused by sample deterioration in traditional characteristic characterization methods, provides a more accurate data basis for the exploration, development and production of shale oil, and has important guiding significance for the formulation of shale oil exploration and development plans.

[0151] Figure 4 An example of a physical structure diagram of an electronic device is shown below. Figure 4As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430 and a communications bus 440, wherein the processor 410, the communications interface 420 and the memory 430 communicate with each other via the communications bus 440. The processor 410 may call the logic instructions in the memory 430 to execute a method for characterizing continental shale oil characteristics, the method comprising: obtaining characteristic data of the first dimension and the second dimension of an aged continental shale sample, and obtaining characteristic data of the first dimension of a fresh continental shale sample; the aged continental shale sample is a continental shale sample obtained in a target underground area by a pressure-maintained coring technique, and after being obtained, is placed in a normal temperature and pressure environment and preserved for a period exceeding a first preset time; the fresh continental shale sample is a continental shale sample obtained in a target underground area by a pressure-maintained coring technique, and after being obtained, is placed in a low temperature environment and preserved for a period exceeding a second preset time. The fresh continental shale samples are isolated from the air when stored in a low-temperature environment; the first dimension includes at least one of lithologic type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral combination; based on the characteristic data of the first and second dimensions of the aged continental shale samples and the characteristic data of the first dimension of the fresh continental shale samples, the fresh continental shale samples are characterized by using cryo-focused ion beam scanning electron microscope imaging technology to obtain characteristic data of the third dimension of the fresh continental shale samples; the third dimension includes at least one of the occurrence characteristics, main controlling factors and effective oil storage space.

[0152] Furthermore, the logic instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0153] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the continental shale oil characteristic characterization method provided by the above methods, which includes: obtaining characteristic data of the first dimension and the second dimension of the aged continental shale sample, and obtaining characteristic data of the first dimension of the fresh continental shale sample; the aged continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and after the acquisition, the continental shale sample is placed in a normal temperature and pressure environment and preserved for more than a first preset time; the fresh continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology The terrestrial shale samples are obtained within the period of 2000 and stored in a low-temperature environment for no more than a second preset time after being obtained. The fresh terrestrial shale samples are isolated from the air when stored in the low-temperature environment; the first dimension includes at least one of lithology type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral combination; based on the characteristic data of the first and second dimensions of the aged terrestrial shale samples and the characteristic data of the first dimension of the fresh terrestrial shale samples, the fresh terrestrial shale samples are characterized by using cryo-focused ion beam scanning electron microscope imaging technology to obtain characteristic data of the third dimension of the fresh terrestrial shale samples; the third dimension includes at least one of occurrence characteristics, main controlling factors and effective oil storage space.

[0154] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the continental shale oil characteristic characterization method provided by the above-mentioned methods, the method comprising: obtaining characteristic data of the first dimension and the second dimension of an aged continental shale sample, and obtaining characteristic data of the first dimension of a fresh continental shale sample; the aged continental shale sample is obtained in a target underground area by a pressure-maintained coring technique, and is placed in a normal temperature and pressure environment to preserve the continental shale sample for more than a first preset time after the acquisition; the fresh continental shale sample is obtained in a target underground area by a pressure-maintained coring technique, and is placed in a normal temperature and pressure environment to preserve the continental shale sample after the acquisition; A terrestrial shale sample is stored in a low-temperature environment for no more than a second preset time, and the fresh terrestrial shale sample is isolated from the air when stored in a low-temperature environment; the first dimension includes at least one of lithology type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral combination; based on the characteristic data of the first and second dimensions of the aged terrestrial shale samples and the characteristic data of the first dimension of the fresh terrestrial shale samples, the fresh terrestrial shale samples are characterized by using cryo-focused ion beam scanning electron microscopy imaging technology to obtain characteristic data of the third dimension of the fresh terrestrial shale samples; the third dimension includes at least one of occurrence characteristics, main controlling factors and effective oil storage space.

[0155] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0156] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for characterizing continental shale oil, characterized in that: include: Acquire characteristic data of the first dimension and the second dimension of the aged continental shale sample, and acquire characteristic data of the first dimension of the fresh continental shale sample; The aged continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is stored in a normal temperature and pressure environment for more than a first preset time after being obtained; the fresh continental shale sample is obtained in the target underground area by the pressure-maintaining coring technology, and is stored in a low-temperature environment for no more than a second preset time after being obtained, and the fresh continental shale sample is isolated from air when stored in the low-temperature environment; the first dimension includes at least one of lithology type, lithofacies type and maturity; the second dimension includes at least one of total organic carbon content and / or mineral composition, and the low-temperature environment is a dry ice environment; Based on the characteristic data of the first and second dimensions of the aged continental shale sample and the characteristic data of the first dimension of the fresh continental shale sample, the fresh continental shale sample is characterized by using cryo-focused ion beam scanning electron microscope imaging technology to obtain characteristic data of the third dimension of the fresh continental shale sample; the third dimension includes at least one of the occurrence characteristics, main controlling factors and effective oil storage space.

2. The method for characterizing continental shale oil according to claim 1, wherein: The method of characterizing the fresh continental shale sample using a cryo-focused ion beam scanning electron microscope imaging technique based on the first and second dimension feature data of the aged continental shale sample and the first dimension feature data of the fresh continental shale sample to obtain the third dimension feature data of the fresh continental shale sample includes: Taking a portion of the fresh continental shale sample for slicing, obtaining fresh continental shale sample slices, and obtaining images of the fresh continental shale sample slices; Based on the feature data of the first dimension of the fresh continental shale sample, a first regional positioning model corresponding to the fresh continental shale sample is determined, where the first regional positioning model corresponding to the fresh continental shale sample is obtained after training based on the feature data of the second dimension of the sample stored continental shale sample and position information of a first region of interest on a slice of the sample stored continental shale sample, the feature data of the first dimension of the sample stored continental shale sample matches the feature data of the first dimension of the fresh continental shale sample, the stored continental shale sample includes the sample stored continental shale sample, and the slice of the sample stored continental shale sample is obtained by slicing a portion of the sample stored continental shale sample; Inputting the image of the fresh continental shale sample slice into a first regional positioning model corresponding to the fresh continental shale sample, and obtaining position information of the first region of interest on the fresh continental shale sample slice output by the first regional positioning model corresponding to the fresh continental shale sample; Based on the position information of the first area of ​​interest on the fresh continental shale sample slice, two-dimensional imaging characterization is performed in the first area of ​​interest on the fresh continental shale sample slice using cryo-focused ion beam scanning electron microscope imaging technology, and then the characteristic data of the third dimension of the fresh continental shale sample is obtained based on the two-dimensional imaging characterization result.

3. The method for characterizing continental shale oil according to claim 2, wherein: After obtaining the image of the fresh continental shale sample slice, the method further includes: Determining, based on the feature data of the first dimension of the fresh continental shale sample, a second region of interest positioning model corresponding to the fresh continental shale sample, wherein the second region of interest positioning model corresponding to the fresh continental shale sample is obtained by training based on the feature data of the second dimension of the sampled continental shale sample and position information of the second region of interest on a slice of the sampled continental shale sample; inputting the image of the fresh continental shale sample slice into a second region of interest positioning model corresponding to the fresh continental shale sample, and obtaining position information of the second region of interest on the fresh continental shale sample slice output by the second region of interest positioning model corresponding to the fresh continental shale sample; Based on the position information of the second region of interest on the fresh continental shale sample slice, the second region of interest on the fresh continental shale sample slice is subjected to three-dimensional imaging characterization using cryo-focused ion beam scanning electron microscopy imaging technology within the second region of interest on the fresh continental shale sample slice, and then the characteristic data of the third dimension of the fresh continental shale sample is obtained based on the three-dimensional imaging characterization result.

4. The method for characterizing continental shale oil according to claim 3, wherein: The method of performing two-dimensional imaging characterization in the first region of interest on the fresh continental shale sample slice using a cryo-focused ion beam scanning electron microscope imaging technique based on the position information of the first region of interest on the fresh continental shale sample slice includes: pre-processing the fresh continental shale sample slice to obtain a pre-processed fresh continental shale sample slice; Transferring the pretreated fresh continental shale sample slice into a sample chamber of a cryo-focused ion beam scanning electron microscope in a frozen state, and etching a plurality of two-dimensional fresh surfaces within the first region of interest on the pretreated fresh continental shale sample slice using a focused ion beam at a first temperature; Acquiring a scanning electron microscope image of the fresh surface using the cryo-focused ion beam scanning electron microscope as the two-dimensional imaging characterization result, and acquiring chemical composition data of the fresh surface using an energy dispersive spectrometer carried by the cryo-focused ion beam scanning electron microscope as the two-dimensional imaging characterization result; The pretreated fresh terrestrial shale sample slices are heated to a second temperature, and a scanning electron microscope is used to obtain a scanning electron microscope image of the fresh surface again at the second temperature as the two-dimensional imaging characterization result. The energy spectrometer equipped with the scanning electron microscope is used to obtain chemical composition data of the fresh surface again as the two-dimensional imaging characterization result.

5. The method for characterizing continental shale oil according to claim 4, wherein: The method of performing three-dimensional imaging characterization of the second region of interest on the fresh continental shale sample slice using a cryo-focused ion beam scanning electron microscope imaging technique within the second region of interest on the fresh continental shale sample slice based on the position information of the second region of interest on the fresh continental shale sample slice comprises: At the first temperature, a focused ion beam is used to etch a cube of a target size in the second region of interest on the pretreated fresh continental shale sample slice; Slicing the cube with a preset thickness using a focused ion beam at the first temperature, obtaining a scanning electron microscope image of each cube slice using the cryo-focused ion beam scanning electron microscope, and obtaining chemical composition data of each cube slice using an energy dispersive spectrometer onboard the cryo-focused ion beam scanning electron microscope, wherein the number of cube slices is a preset number; Three-dimensional skeleton modeling is performed based on the scanning electron microscope images of each of the cube slices to obtain a three-dimensional skeleton model of the cube. A pore space structure is generated in the three-dimensional skeleton model of the cube based on the chemical composition data of each of the cube slices to obtain a three-dimensional model of the cube as the three-dimensional imaging characterization result.

6. The method for characterizing continental shale oil according to any one of claims 1 to 5, characterized in that: The fresh continental shale sample is obtained by the following steps: after obtaining the continental shale sample from the target underground area by using a pressure-maintaining coring technique, a protective layer for isolating air is coated on the surface of the continental shale sample; After the surface of the continental shale sample is coated with the protective layer, the continental shale sample coated with the protective layer is stored in dry ice; When the storage time of the continental shale sample coated with the protective layer in dry ice does not exceed the second preset time, the continental shale sample is determined to be the fresh continental shale sample.

7. A device for characterizing continental shale oil, characterized in that: include: a data acquisition module, configured to acquire characteristic data of a first dimension and a second dimension of an aged continental shale sample, and to acquire characteristic data of the first dimension of a fresh continental shale sample; the aged continental shale sample is obtained in a target underground area by a pressure-maintained coring technique, and is subsequently placed in a normal temperature and pressure environment for preservation for a first preset time; the fresh continental shale sample is obtained in the target underground area by a pressure-maintained coring technique, and is subsequently placed in a low-temperature environment for preservation for a second preset time, wherein the fresh continental shale sample is isolated from air when stored in the low-temperature environment; the first dimension includes at least one of lithologic type, lithofacies type, and maturity; the second dimension includes at least one of total organic carbon content and / or mineral composition, and the low-temperature environment is a dry ice environment; A feature characterization module is used to characterize the fresh continental shale sample based on the feature data of the first and second dimensions of the aged continental shale sample and the feature data of the first dimension of the fresh continental shale sample using cryo-focused ion beam scanning electron microscope imaging technology to obtain feature data of the third dimension of the fresh continental shale sample; the third dimension includes at least one of occurrence characteristics, main controlling factors and effective oil storage space.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for characterizing continental shale oil characteristics as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for characterizing continental shale oil characteristics as described in any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for characterizing continental shale oil characteristics as described in any one of claims 1 to 6 is implemented.

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