Continental facies shale oil and gas small layer division and comparison method, device, equipment and medium

Abstract

The invention provides a continental facies shale oil and gas small layer division and comparison method, device, equipment and medium. The method comprises the following steps: acquiring a lithology identification result and a thickness calibration result of each interlayer of a drilling target interval; according to the combination relation between the shale in the target interval and the interlayers of different lithology types and different scales, subsection division is conducted on the well drilling target interval; organic geochemical parameters of shale in a target interval of well drilling are measured, wherein the organic geochemical parameters comprise TOC, Ro, kerogen carbon isotope and rock pyrolysis hydrocarbon amount; calculating a hydrogen index of shale in a well drilling target interval; according to the difference of Ro, selecting a hydrogen index, a kerogen carbon isotope or a combination of the hydrogen index and the kerogen carbon isotope to carry out small-layer division; inter-well small-layer comparison is carried out, and a small-layer comparison framework is established. According to the method, hydrocarbon generation quality difference re-subdivision can be effectively carried out on the shale layer section rich in organic matter, and the established small-layer comparison framework can effectively reflect longitudinal and transverse deposition cause changes and relations of the continental facies shale layer section with extremely high heterogeneity.

Description

Technical Field

[0001] The present invention relates to the technical field of shale oil and gas exploration and development, and in particular to a method, device, equipment and medium for dividing and comparing continental shale oil and gas sublayers. Background Art

[0002] There are obvious differences in the development characteristics of continental shale intervals and marine shale intervals. The marine shale has good vertical continuity, basically no interlayer development, and is dominated by a single organic type, while the continental shale interval is extremely heterogeneous and often develops interlayers. The types of interlayers mainly include sandstone, carbonate rock (limestone, dolomite), and tuff. The interlayer type can be one or more of them. Shale organic types are diverse, mostly more than two. For example, the organic types of the Cretaceous Quantou Formation and Qingshankou Formation in the Songliao Basin and the Paleogene Shahejie Formation in the Bohai Bay Basin are mainly type I and II; the shale of the Paleogene Xiaganchaigou Formation in the Qaidam Basin is developed with type I, II and III organic matter, reflecting the frequent changes in the sedimentary environment in the vertical direction. Therefore, it is difficult to accurately divide and compare the sublayers for oil and gas exploration and development in continental shale.

[0003] At present, the traditional petrological division method used for marine shale intervals is mainly based on the vertical lithology, electrical property differences and sedimentary cyclicity of marine shale intervals, and the development of sub-layers is divided and compared. However, the traditional petrological division method is difficult to reflect the vertical and lateral sedimentary genetic changes and connections of the highly heterogeneous continental shale intervals. Summary of the invention

[0004] In order to solve the technical problem that it is difficult to reflect the vertical and lateral sedimentary genetic changes and connections of highly heterogeneous continental shale layers when using traditional rock stratigraphic methods to carry out sub-layer division and comparison, the present invention proposes a continental shale oil and gas sub-layer division and comparison method, device, equipment and medium.

[0005] In a first aspect, an embodiment of the present invention provides a method for dividing and comparing continental shale oil and gas sublayers, comprising:

[0006] Obtain the lithology type identification results and thickness calibration results of each interlayer in the target drilling interval;

[0007] The target layer section is divided into sub-sections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section, and each different scale corresponds to a thickness interval;

[0008] Determine the organic geochemical parameters of the shale in the target layer of the drilling, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope and rock pyrolysis hydrocarbon content;

[0009] Calculate the hydrogen index of the shale in the target drilling layer according to the pyrolysis hydrocarbon content of the rock;

[0010] According to the difference of Ro of the drilling target layer segment, the drilling target layer segment which has been divided into sub-segments is divided into small layers according to at least one of hydrogen index and kerogen carbon isotope;

[0011] The inter-well small layer lateral comparison is carried out for different drilling target layers in the study area, and an isochronous comparison framework for different drilling target layers in the study area is established.

[0012] In some implementations, when the Ro of a target drilling layer segment is lower than a preset Ro threshold, the target drilling layer segment that has been divided into sub-segments is selected to be divided into small layers based on at least one of the hydrogen index and kerogen carbon isotope.

[0013] In some implementations, when the Ro of a target drilling layer is not lower than a preset Ro threshold, the target drilling layer is divided into organic matter types according to kerogen carbon isotopes.

[0014] In some implementations, the sub-dividing of the target drilling layer into sub-layers is performed according to the hydrogen index and the kerogen carbon isotope, including:

[0015] According to the kerogen carbon isotope, the target drilling layer that has been divided into sub-segments is divided into organic matter types;

[0016] For layers of the same organic matter type, sub-layers are divided according to changes in the hydrogen index.

[0017] In some implementations, the target layer for drilling is divided into small layers according to kerogen carbon isotopes, including:

[0018] Based on kerogen carbon isotopes, the three-category four-division standard is used to classify organic matter types;

[0019] According to the divided organic matter types, the drilling target layer segment that has been divided into sub-segments is divided into small layers vertically.

[0020] In some implementations, the drilling target layer segment that has been divided into sub-segments is divided into small layers according to the hydrogen index, including:

[0021] According to the numerical variation range of the hydrogen index of the target layer section, the numerical range of the hydrogen index corresponding to the sub-layer to be divided is set;

[0022] According to the set hydrogen index value range corresponding to the sub-layer to be divided, the drilling target layer section that has been divided into sub-segments is divided into sub-layers.

[0023] In some implementations, according to the vertical variation patterns of organic matter types or hydrogen indexes in different drilling target layers in the study area, inter-well sub-layer lateral comparison is performed for different drilling target layers in the study area.

[0024] In a second aspect, an embodiment of the present invention provides a device for dividing and comparing continental shale oil and gas layers, comprising:

[0025] The first processing module is used to obtain the lithology type identification results of each interlayer in the target drilling layer section and the thickness of each interlayer for calibration results;

[0026] The first layer segment division module is used to divide the target layer segment into sub-segments according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer segment, and different interlayer scales each correspond to a thickness interval;

[0027] A determination module is used to determine the organic geochemical parameters of shale in each sub-section of the target drilling layer, wherein the organic geochemical parameters include TOC, Ro and rock pyrolysis hydrocarbon content;

[0028] A calculation module, used to calculate the hydrogen index of shale in the target drilling layer according to the amount of hydrocarbons in rock pyrolysis;

[0029] The second layer segment division module is used to select at least one of hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers according to the difference of Ro of the drilling target layer segment;

[0030] The second processing module is used to perform inter-well small layer lateral comparison of different drilling target layers in the study area and establish an isochronous comparison grid of different drilling target layers in the study area.

[0031] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by at least one processor, the method described in the first aspect is implemented.

[0032] In a fourth aspect, an embodiment of the present invention provides an electronic device, comprising a memory and at least one processor, wherein the memory stores a computer program, and when the computer program is executed by the at least one processor, the method described in the first aspect is implemented.

[0033] One or more embodiments of the present invention bring at least the following beneficial effects:

[0034] The present invention, based on the accurate lithology identification and thickness quantification of drilling core shale and interlayers of different lithology types and scales, divides the shale into small layers based on the change of hydrogen index or kerogen carbon isotope value in the vertical direction and the value range, and conducts lateral comparison of small layers of different drilling target layers in the study area, and establishes an isochronous comparison framework of different drilling target layers in the study area, so as to effectively subdivide the organic-rich shale layers for hydrocarbon generation quality differences, provide a small layer division and comparative research method for shale oil and gas exploration and development in continental shale formations, and provide a reliable basis for optimizing oil and gas rich development small layers and formulating development deployment and development plans more scientifically. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0036] Figure 1 A flow chart of a method for dividing and comparing continental shale oil and gas layers provided in an embodiment of the present invention;

[0037] Figure 2 A histogram of the sub-layer division of the second section of the Fuzhou section in the HQ1 well in the A area provided by the embodiment of the present invention;

[0038] Figure 3 A comparison diagram of the small layers of the Dongyuemiao section in Area B provided in an embodiment of the present invention;

[0039] Figure 4 A structural block diagram of a device for dividing and comparing continental shale oil and gas layers provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0041] Embodiment 1

[0042] In order to overcome the shortcomings of using traditional rock formation methods to carry out sub-layer division and comparison, this embodiment provides a method for the division and comparison of continental shale oil and gas sub-layers. The method provided by this embodiment is suitable for the division and comparison of sub-layers of shale oil and gas layers where the organic matter type or the content of the main organic microscopic components varies vertically and the sedimentary phase area is relatively stable horizontally. It can achieve a fine distinction between the hydrocarbon-rich oil and gas quality of different sub-layers in the vertical direction, and provide a decision-making basis for determining the optimal exploration and development layer for drilling and for the scientific formulation of exploration deployment and development plans on the work area. Figure 1 As shown, the method includes the following steps.

[0043] Step S100, obtaining the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer. Specifically, the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer are obtained by observing the core of the drilling target layer section in the continental shale research area, identifying the lithology (such as sandstone, carbonate rock, tuff, etc.) of each interlayer in the drilling target layer section and calibrating the thickness of each interlayer.

[0044] Step S200, subdividing the target layer section for drilling into subsections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section. Different interlayer scales correspond to a thickness interval, for example: the interlayer with a thickness of ≥1m corresponds to a blocky scale, the interlayer with a thickness of [0.5m, 1m) corresponds to a thick layer scale, the interlayer with a thickness of [0.1m, 0.5m) corresponds to a medium layer scale, the interlayer with a thickness of [0.01m, 0.1m) corresponds to a thin layer scale, and the interlayer with a thickness of <0.01m corresponds to a laminar scale. For example, if there are more than two types of lithology in the interlayer, including sandstone, carbonate rock and tuff, it can be divided into sub-sections according to shale intercalated limestone section, shale intercalated sandstone section, shale intercalated limestone and sandstone section (sub-section one, sub-section two, sub-section three...); if there is only one type of interlayer, such as limestone, it can be divided into sub-sections according to shale intercalated thick limestone, shale intercalated thin limestone, shale intercalated laminated limestone, etc. (sub-section one, sub-section two, sub-section three...).

[0045] Step S300, determining the organic geochemical parameters of the shale in the target drilling layer, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope, rock pyrolysis hydrocarbon content, etc.

[0046] Among them, the Ro value is an important parameter in geology, usually used to describe the thermal evolution of source rocks. The Ro value is an indicator reflecting the maturity of organic matter in source rocks, and is used to determine whether the source has entered the oil generation or gas generation stage. Under normal circumstances, as the burial depth increases and the temperature rises, the maturity of organic matter in the rock (Ro value) gradually increases. When the Ro value enters the oil generation or gas generation window, the organic matter pyrolyzes or thermally cracks, producing a series of chemical reactions, and finally forming hydrocarbon compounds such as oil and gas. The higher the Ro value, the higher the maturity of the organic matter in the rock. Under certain conditions, the greater the oil and gas generation potential of the rock. In oil exploration, the Ro value is one of the important bases for evaluating the quality of source rocks, and has a key impact on the success of exploration.

[0047] Step S400, calculating the hydrogen index of the shale in the target drilling layer according to the amount of pyrolysis hydrocarbons in the rock. The hydrogen index is calculated using the following formula:

[0048] HI = (S2 × 100) / TOC;

[0049] Among them, HI is the hydrogen index, S2 is the amount of rock pyrolysis hydrocarbons, and TOC is the organic carbon content.

[0050] Step S500, based on the difference in Ro of the drilling target layer segment, select at least one of the hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0051] In some implementations, the step of selecting at least one of hydrogen index and kerogen carbon isotope to divide the target drilling layer into small layers according to the difference in Ro of the target drilling layer includes:

[0052] When the Ro of the drilling target layer segment is lower than the preset Ro threshold (in this embodiment, the Ro threshold is set to 1.3%), at least one of the hydrogen index and kerogen carbon isotope is selected to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0053] When the Ro of the target drilling layer is not lower than the preset Ro threshold, the hydrogen index of the shale has dropped to a lower value (HI < 100) with the continuous increase in the degree of thermal evolution. At this time, it is difficult to distinguish the differences between shales of different organic types based on the hydrogen index of the shale. Therefore, the target drilling layer that has been divided into sub-segments is divided into organic types vertically based on the measured kerogen carbon isotope values, and the divided small layers are named ①, ②, ③, ..., n from bottom to top.

[0054] The sub-layer division scheme specifically includes:

[0055] (1) Divide the sub-divided target drilling layer into sub-layers according to the hydrogen index, including: according to the numerical variation range of the hydrogen index of the target drilling layer, such as HI between 44 and 442 mg / g, set the hydrogen index value interval corresponding to the sub-layer to be divided, such as HI value <200 mg / g, HI value between 200 mg / g and 400 mg / g; divide the sub-divided target drilling layer into sub-layers according to the set hydrogen index value interval corresponding to the sub-layer to be divided. The test cycle required for the measurement of kerogen carbon isotopes is long, so this method is the most economical and effective.

[0056] (2) Divide the subdivided target drilling layer into small layers according to the kerogen carbon isotope, including: dividing the target drilling layer into layers of organic matter types according to the measured kerogen carbon isotope values. Specifically, according to the measured kerogen carbon isotope values, the organic matter types are divided using a three-category four-division standard (type I, type II1, type II2, type III); then, the subdivided target drilling layer is divided into a number of (1, 2, 3, ..., n) layers vertically according to the divided organic matter types.

[0057] (3) According to the kerogen carbon isotope and hydrogen index, the sub-layers of the target drilling layer section that has been divided into sub-segments are divided into small layers, including: according to the measured kerogen carbon isotope value, the layer section of the target drilling layer section that has been divided into sub-segments is divided into organic matter types; because the value of the hydrogen index is closely related to the organic matter type when Ro is the same for different organic matter types, under normal circumstances, the hydrogen index of type I-type-II1-type-II2-type-III shale decreases in sequence. In other words, for the same target layer section of the same well, the larger the hydrogen index, the more it reflects the change in the organic sedimentary environment of the shale. Therefore, on the basis of the above-mentioned layer section division of organic matter type, the sub-layers can be further determined and divided according to the hydrogen index. For example, if there is a thick layer section in the layer section divided according to the organic matter type, it can be further subdivided according to the slight change of the hydrogen index, and the divided sub-layers are named from bottom to top as ①, ②, ③, ..., n.

[0058] Step S600, performing inter-well lateral sub-layer comparison of different drilling target layers in the study area, and establishing an isochronous comparison framework of different drilling target layers in the study area.

[0059] Specifically, according to the vertical variation law of organic matter type or hydrogen index of different target layers in the study area, the target layers of different drillings in the study area are compared horizontally between wells, and an isochronous comparison framework of different target layers in the study area is established. The isochronous comparison framework of target layers of different drillings in the study area can characterize the temporal and spatial distribution variation law of different small layers, thereby providing a reliable basis for the development deployment and development plan of continental shale oil and gas.

[0060] The method provided in this embodiment uses the difference between the hydrogen index and the kerogen carbon isotope to reflect the difference in shale hydrocarbon-generating parent material organisms. Therefore, the sub-layer division based on the numerical changes in the hydrogen index and the kerogen carbon isotope can reflect the differences in the sedimentary environments of different sub-layers, and the lateral comparison is more isochronous. It can provide a basis for the accurate determination of terrestrial shale oil and gas development sub-layers and for formulating development plans more scientifically at different stages.

[0061] Embodiment 2

[0062] According to the method provided in Example 1, the sub-layer division and comparative study of continental shale oil and gas development were conducted on Well HQ1 in Basin A, Well LY1 and Well LY3 in Basin B.

[0063] Step 1: The core samples taken from Well HQ1 in Basin A, Well LY1 and Well LY3 in Basin B were observed and described, the lithology of the Fu 2 section of Well HQ1 and the Dongyuemiao section of Well LY1 and Well LY3 were accurately identified and calibrated, and the sub-sections were divided according to the combination relationship between shale and interlayers of different lithology types and scales.

[0064] Step 2: Determine the organic geochemical parameters such as TOC, Ro, rock pyrolysis experimental test data, and kerogen carbon isotope of the shales in the Fu 2 section of well HQ1, the Dongyuemiao section of well LY1, and the Dongyuemiao section of well LY3, and then calculate the hydrogen index of the shale based on the rock pyrolysis experimental test data.

[0065] Step 3: The Ro of the second section of the HQ1 well is 0.9%, which is less than 1.3% (Ro threshold). The organic matter type is in the mature stage. The hydrogen index (HI) is between 44 and 442 mg / g. There are obvious differences between different sections in the vertical direction. The vertical fine division of small layers is carried out based on the principle of HI values ​​of <200 mg / g and 200 mg / g to 400 mg / g. The division results are shown in the figure. Figure 2 shown.

[0066] Step 4: The Ro of the Dongyuemiao section in Wells LY1 and LY3 is 1.6%, which is greater than 1.3%. The organic matter is at a high maturity stage. Based on the measured kerogen carbon isotope values, the three-category four-division method is used to divide the organic matter types vertically. The Dongyuemiao section undergoes five changes and is divided into five sublayers. The division results are shown in the figure. Figure 3 shown.

[0067] Step 5: Figure 3As shown in the figure, the sub-layer comparison of the Dongyuemiao section of Well LY1 and Well LY3 in Basin B shows that the vertical variation pattern of the organic matter types of the Dongyuemiao section shale in the two wells is consistent, and the horizontal comparability is good. Based on this, the existing wells in the organic-rich shale depositional area of ​​Basin B can be divided into sub-layers, and the isochronous comparison framework of the Dongyuemiao section can be established to reveal the temporal and spatial distribution of each sub-layer shale, providing a basis for the development deployment and development plan formulation of the study area.

[0068] Embodiment 3

[0069] This embodiment provides a device for dividing and comparing continental shale oil and gas layers. Figure 4 As shown, including:

[0070] The first processing module 410 is used to obtain the lithology type identification results of each interlayer in the drilling target layer section and the thickness calibration results of each interlayer. Specifically, the lithology type identification results of each interlayer in the drilling target layer section and the thickness calibration results of each interlayer are obtained by observing the core of the drilling target layer section in the continental shale research area, identifying the lithology (such as sandstone, carbonate rock, tuff, etc.) of each interlayer in the drilling target layer section and calibrating the thickness of each interlayer.

[0071] The first layer segment division module 420 is used to divide the drilling target layer segment into sub-segments according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer segment. Different interlayer scales each correspond to a thickness interval, for example: the scale corresponding to the interlayer with a thickness ≥1m is blocky, the scale corresponding to the interlayer with a thickness of [0.5m, 1m) is thick, the scale corresponding to the interlayer with a thickness of [0.1m, 0.5m) is middle, the scale corresponding to the interlayer with a thickness of [0.01m, 0.1m) is thin, and the scale corresponding to the interlayer with a thickness of <0.01m is laminar. For example, if there are more than two types of lithology in the interlayer, including sandstone, carbonate rock and tuff, it can be divided into sub-sections according to shale intercalated limestone section, shale intercalated sandstone section, shale intercalated limestone and sandstone section (sub-section one, sub-section two, sub-section three...); if there is only one type of interlayer, such as limestone, it can be divided into sub-sections according to shale intercalated thick limestone, shale intercalated thin limestone, shale intercalated laminated limestone, etc. (sub-section one, sub-section two, sub-section three...).

[0072] The determination module 430 is used to determine the organic geochemical parameters of shale in each sub-section of the target layer section of the drilling, and the organic geochemical parameters include TOC, Ro and the amount of pyrolysis hydrocarbons in the rock.

[0073] Among them, the Ro value is an important parameter in geology, usually used to describe the thermal evolution of source rocks. The Ro value is an indicator reflecting the maturity of organic matter in source rocks, and is used to determine whether the source has entered the oil generation or gas generation stage. Under normal circumstances, as the burial depth increases and the temperature rises, the maturity of organic matter in the rock (Ro value) gradually increases. When the Ro value enters the oil generation or gas generation window, the organic matter pyrolyzes or thermally cracks, producing a series of chemical reactions, and finally forming hydrocarbon compounds such as oil and gas. The higher the Ro value, the higher the maturity of the organic matter in the rock. Under certain conditions, the greater the oil and gas generation potential of the rock. In oil exploration, the Ro value is one of the important bases for evaluating the quality of source rocks, and has a key impact on the success of exploration.

[0074] The calculation module 440 is used to calculate the hydrogen index of the shale in the target drilling layer according to the amount of pyrolysis hydrocarbons in the rock. The hydrogen index is calculated using the following calculation formula:

[0075] HI = (S2 × 100) / TOC;

[0076] Among them, HI is the hydrogen index, S2 is the amount of rock pyrolysis hydrocarbons, and TOC is the organic carbon content.

[0077] The second layer segment division module 450 is used to divide the drilling target layer segment that has been divided into sub-segments into small layers according to the difference in Ro of the drilling target layer segment, and select at least one of the hydrogen index and kerogen carbon isotope.

[0078] In some implementations, when the Ro of the drilling target layer segment is lower than a preset Ro threshold (in this embodiment, the Ro threshold is set to 1.3%), at least one of the hydrogen index and kerogen carbon isotope is selected to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0079] When the Ro of the target drilling layer is not lower than the preset Ro threshold, the hydrogen index of the shale has dropped to a lower value (HI < 100) with the increasing degree of thermal evolution. At this time, it is difficult to distinguish the differences between shales of different organic types based on the hydrogen index of the shale. Therefore, the target drilling layer that has been divided into sub-segments is divided vertically according to the measured kerogen carbon isotope value, and the divided small layers are named ①, ②, ③, ..., n from bottom to top.

[0080] The sub-layer division scheme specifically includes:

[0081] (1) Divide the sub-divided target drilling layer into sub-layers according to the hydrogen index, including: according to the numerical variation range of the hydrogen index of the target drilling layer, such as HI between 44 and 442 mg / g, set the hydrogen index value interval corresponding to the sub-layer to be divided, such as HI value <200 mg / g, HI value between 200 mg / g and 400 mg / g; divide the sub-divided target drilling layer into sub-layers according to the set hydrogen index value interval corresponding to the sub-layer to be divided. The test cycle required for the measurement of kerogen carbon isotopes is long, so this method is the most economical and effective.

[0082] (2) Divide the sub-divided target drilling layer into small layers according to the kerogen carbon isotope pairs, including: dividing the target drilling layer into layers of organic matter types according to the measured kerogen carbon isotope values. Specifically, according to the measured kerogen carbon isotope values, the organic matter types are divided using a three-category four-division standard (type I, type II1, type II2, type III); then, according to the divided organic matter type pairs, the sub-divided target drilling layer is divided into a number of (1, 2, 3, ..., n) layers vertically.

[0083] (3) Divide the target drilling layer into sub-layers according to the kerogen carbon isotope and hydrogen index, including: divide the target drilling layer into sub-layers according to the measured kerogen carbon isotope value; because the value of the hydrogen index is closely related to the organic matter type under the same Ro of different organic matter types, usually, the hydrogen index of type I-type II1-type II2-type III shale decreases in sequence. That is to say, for the same target layer of the same well, the larger the hydrogen index, the more it reflects the change in the organic sedimentary environment of the shale. Therefore, on the basis of the above-mentioned layer division of organic matter type, the sub-layers can be further determined and divided according to the hydrogen index. For example, if there is a thick layer in the layer divided according to the organic matter type, it can be further subdivided according to the slight change of the hydrogen index, and the divided sub-layers are named ①, ②, ③, ..., n from bottom to top.

[0084] The second processing module 460 is used to perform inter-well sub-layer lateral comparison of different drilling target layers in the study area and establish an isochronous comparison framework of different drilling target layers in the study area.

[0085] Specifically, according to the vertical variation law of organic matter type or hydrogen index of different target layers in the study area, the target layers of different drillings in the study area are compared horizontally between wells, and an isochronous comparison framework of different target layers in the study area is established. The isochronous comparison framework of target layers of different drillings in the study area can characterize the temporal and spatial distribution variation law of different small layers, thereby providing a reliable basis for the development deployment and development plan of continental shale oil and gas.

[0086] The device provided in this embodiment divides the shale into small layers based on the change of hydrogen index or kerogen carbon isotope value in the vertical direction and the range of values, and conducts lateral comparison of small layers in different drilling target layers in the study area on the basis of accurate lithology identification and thickness quantification of drilling core shale and interlayers of different lithology types and scales. It also establishes an isochronous comparison framework for different drilling target layers in the study area, thereby effectively subdividing the organic-rich shale layers according to the difference in hydrocarbon generation quality. It can provide a small layer division and comparative research method for shale oil and gas exploration and development in continental shale formations, and provide a reliable basis for selecting oil and gas-rich development small layers and formulating development deployment and development plans more scientifically.

[0087] Embodiment 4

[0088] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by at least one processor, the method for dividing and comparing continental shale oil and gas layers of the aforementioned embodiment is implemented.

[0089] Among them, the computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (EEPRoM), erasable programmable read-only memory (Erasable PRogrammable Read-Only Memory, referred to as EPRoM), programmable read-only memory (PRogrammable Read-Only Memory, referred to as PRoM), read-only memory (Read-Only Memory, referred to as RoM), magnetic storage, flash memory, magnetic disk or optical disk.

[0090] The present embodiment implements a method for dividing and comparing continental shale oil and gas sublayers, which includes the following steps.

[0091] Step S100, obtaining the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer. Specifically, the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer are obtained by observing the core of the drilling target layer section in the continental shale research area, identifying the lithology (such as sandstone, carbonate rock, tuff, etc.) of each interlayer in the drilling target layer section and calibrating the thickness of each interlayer.

[0092] Step S200, subdividing the target layer section for drilling into subsections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section. Different interlayer scales correspond to a thickness interval, for example: the interlayer with a thickness of ≥1m corresponds to a blocky scale, the interlayer with a thickness of [0.5m, 1m) corresponds to a thick layer scale, the interlayer with a thickness of [0.1m, 0.5m) corresponds to a medium layer scale, the interlayer with a thickness of [0.01m, 0.1m) corresponds to a thin layer scale, and the interlayer with a thickness of <0.01m corresponds to a laminar scale. For example, if there are more than two types of lithology in the interlayer, including sandstone, carbonate rock and tuff, it can be divided into sub-sections according to shale intercalated limestone section, shale intercalated sandstone section, shale intercalated limestone and sandstone section (sub-section one, sub-section two, sub-section three...); if there is only one type of interlayer, such as limestone, it can be divided into sub-sections according to shale intercalated thick limestone, shale intercalated thin limestone, shale intercalated laminated limestone, etc. (sub-section one, sub-section two, sub-section three...).

[0093] Step S300, determining the organic geochemical parameters of the shale in the target drilling layer, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope, rock pyrolysis hydrocarbon content, etc.

[0094] Among them, the Ro value is an important parameter in geology, usually used to describe the thermal evolution of source rocks. The Ro value is an indicator reflecting the maturity of organic matter in source rocks, and is used to determine whether the source has entered the oil generation or gas generation stage. Under normal circumstances, as the burial depth increases and the temperature rises, the maturity of organic matter in the rock (Ro value) gradually increases. When the Ro value enters the oil generation or gas generation window, the organic matter pyrolyzes or thermally cracks, producing a series of chemical reactions, and finally forming hydrocarbon compounds such as oil and gas. The higher the Ro value, the higher the maturity of the organic matter in the rock. Under certain conditions, the greater the oil and gas generation potential of the rock. In oil exploration, the Ro value is one of the important bases for evaluating the quality of source rocks, and has a key impact on the success of exploration.

[0095] Step S400, calculating the hydrogen index of the shale in the target drilling layer according to the amount of pyrolysis hydrocarbons in the rock. The hydrogen index is calculated using the following formula:

[0096] HI = (S2 × 100) / TOC;

[0097] Among them, HI is the hydrogen index, S2 is the amount of rock pyrolysis hydrocarbons, and TOC is the organic carbon content.

[0098] Step S500, based on the difference in Ro of the drilling target layer segment, select at least one of the hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0099] In some implementations, the step of selecting at least one of hydrogen index and kerogen carbon isotope to divide the target drilling layer into small layers according to the difference in Ro of the target drilling layer includes:

[0100] When the Ro of the drilling target layer segment is lower than the preset Ro threshold (in this embodiment, the Ro threshold is set to 1.3%), at least one of the hydrogen index and kerogen carbon isotope is selected to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0101] When the Ro of the target drilling layer is not lower than the preset Ro threshold, the hydrogen index of the shale has dropped to a lower value (HI < 100) with the continuous increase in the degree of thermal evolution. At this time, it is difficult to distinguish the differences between shales of different organic types based on the hydrogen index of the shale. Therefore, the target drilling layer that has been divided into sub-segments is divided into organic types vertically based on the measured kerogen carbon isotope values, and the divided small layers are named ①, ②, ③, ..., n from bottom to top.

[0102] The sub-layer division scheme specifically includes:

[0103] (1) Divide the sub-divided target drilling layer into sub-layers according to the hydrogen index, including: according to the numerical variation range of the hydrogen index of the target drilling layer, such as HI between 44 and 442 mg / g, set the hydrogen index value interval corresponding to the sub-layer to be divided, such as HI value <200 mg / g, HI value between 200 mg / g and 400 mg / g; divide the sub-divided target drilling layer into sub-layers according to the set hydrogen index value interval corresponding to the sub-layer to be divided. The test cycle required for the measurement of kerogen carbon isotopes is long, so this method is the most economical and effective.

[0104] (2) Divide the subdivided target drilling layer into small layers according to the kerogen carbon isotope, including: dividing the target drilling layer into layers of organic matter types according to the measured kerogen carbon isotope values. Specifically, according to the measured kerogen carbon isotope values, the organic matter types are divided using a three-category four-division standard (type I, type II1, type II2, type III); then, the subdivided target drilling layer is divided into a number of (1, 2, 3, ..., n) layers vertically according to the divided organic matter types.

[0105] (3) According to the kerogen carbon isotope and hydrogen index, the sub-layers of the target drilling layer section that has been divided into sub-segments are divided into small layers, including: according to the measured kerogen carbon isotope value, the layer section of the target drilling layer section that has been divided into sub-segments is divided into organic matter types; because the value of the hydrogen index is closely related to the organic matter type when Ro is the same for different organic matter types, under normal circumstances, the hydrogen index of type I-type-II1-type-II2-type-III shale decreases in sequence. In other words, for the same target layer section of the same well, the larger the hydrogen index, the more it reflects the change in the organic sedimentary environment of the shale. Therefore, on the basis of the above-mentioned layer section division of organic matter type, the sub-layers can be further determined and divided according to the hydrogen index. For example, if there is a thick layer section in the layer section divided according to the organic matter type, it can be further subdivided according to the slight change of the hydrogen index, and the divided sub-layers are named from bottom to top as ①, ②, ③, ..., n.

[0106] Step S600, performing inter-well lateral sub-layer comparison of different drilling target layers in the study area, and establishing an isochronous comparison framework of different drilling target layers in the study area.

[0107] Specifically, according to the vertical variation law of organic matter type or hydrogen index of different target layers in the study area, the target layers of different drillings in the study area are compared horizontally between wells, and an isochronous comparison framework of different target layers in the study area is established. The isochronous comparison framework of target layers of different drillings in the study area can characterize the temporal and spatial distribution variation law of different small layers, thereby providing a reliable basis for the development deployment and development plan of continental shale oil and gas.

[0108] Embodiment 5

[0109] This embodiment provides an electronic device, including a memory and at least one processor, wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method of the above-mentioned embodiment is implemented.

[0110] Among them, the processor can be an application specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), a digital signal processor (Digital Signal PRocessor, referred to as DSP), a digital signal processing device (Digital Signal PRocessing Device, referred to as DSPD), a programmable logic device (PRogrammable Logic Device, referred to as PLD), a field programmable gate array (Field PRogrammable Gate Array, referred to as FPGA), a controller, a microcontroller (Microcontroller Unit, MCU), a microprocessor or other electronic components to implement the continental shale oil and gas sub-layer division and comparison method in the above-mentioned embodiment.

[0111] The present embodiment implements a method for dividing and comparing continental shale oil and gas sublayers, which includes the following steps.

[0112] Step S100, obtaining the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer. Specifically, the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer are obtained by observing the core of the drilling target layer section in the continental shale research area, identifying the lithology (such as sandstone, carbonate rock, tuff, etc.) of each interlayer in the drilling target layer section and calibrating the thickness of each interlayer.

[0113] Step S200, subdividing the target layer section for drilling into subsections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section. Different interlayer scales correspond to a thickness interval, for example: the interlayer with a thickness of ≥1m corresponds to a blocky scale, the interlayer with a thickness of [0.5m, 1m) corresponds to a thick layer scale, the interlayer with a thickness of [0.1m, 0.5m) corresponds to a medium layer scale, the interlayer with a thickness of [0.01m, 0.1m) corresponds to a thin layer scale, and the interlayer with a thickness of <0.01m corresponds to a laminar scale. For example, if there are more than two types of lithology in the interlayer, including sandstone, carbonate rock and tuff, it can be divided into sub-sections according to shale intercalated limestone section, shale intercalated sandstone section, shale intercalated limestone and sandstone section (sub-section one, sub-section two, sub-section three...); if there is only one type of interlayer, such as limestone, it can be divided into sub-sections according to shale intercalated thick limestone, shale intercalated thin limestone, shale intercalated laminated limestone, etc. (sub-section one, sub-section two, sub-section three...).

[0114] Step S300, determining the organic geochemical parameters of the shale in the target drilling layer, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope, rock pyrolysis hydrocarbon content, etc.

[0115] Among them, the Ro value is an important parameter in geology, usually used to describe the thermal evolution of source rocks. The Ro value is an indicator reflecting the maturity of organic matter in source rocks, and is used to determine whether the source has entered the oil generation or gas generation stage. Under normal circumstances, as the burial depth increases and the temperature rises, the maturity of organic matter in the rock (Ro value) gradually increases. When the Ro value enters the oil generation or gas generation window, the organic matter pyrolyzes or thermally cracks, producing a series of chemical reactions, and finally forming hydrocarbon compounds such as oil and gas. The higher the Ro value, the higher the maturity of the organic matter in the rock. Under certain conditions, the greater the oil and gas generation potential of the rock. In oil exploration, the Ro value is one of the important bases for evaluating the quality of source rocks, and has a key impact on the success of exploration.

[0116] Step S400, calculating the hydrogen index of the shale in the target drilling layer according to the amount of pyrolysis hydrocarbons in the rock. The hydrogen index is calculated using the following formula:

[0117] HI = (S2 × 100) / TOC;

[0118] Among them, HI is the hydrogen index, S2 is the amount of rock pyrolysis hydrocarbons, and TOC is the organic carbon content.

[0119] Step S500, based on the difference in Ro of the drilling target layer segment, select at least one of the hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0120] In some implementations, the step of selecting at least one of hydrogen index and kerogen carbon isotope to divide the target drilling layer into small layers according to the difference in Ro of the target drilling layer includes:

[0121] When the Ro of the drilling target layer segment is lower than the preset Ro threshold (in this embodiment, the Ro threshold is set to 1.3%), at least one of the hydrogen index and kerogen carbon isotope is selected to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0122] When the Ro of the target drilling layer is not lower than the preset Ro threshold, the hydrogen index of the shale has dropped to a lower value (HI < 100) with the continuous increase in the degree of thermal evolution. At this time, it is difficult to distinguish the differences between shales of different organic types based on the hydrogen index of the shale. Therefore, the target drilling layer that has been divided into sub-segments is divided into organic types vertically based on the measured kerogen carbon isotope values, and the divided small layers are named ①, ②, ③, ..., n from bottom to top.

[0123] The sub-layer division scheme specifically includes:

[0124] (1) Divide the sub-divided target drilling layer into sub-layers according to the hydrogen index, including: according to the numerical variation range of the hydrogen index of the target drilling layer, such as HI between 44 and 442 mg / g, set the hydrogen index value interval corresponding to the sub-layer to be divided, such as HI value <200 mg / g, HI value between 200 mg / g and 400 mg / g; divide the sub-divided target drilling layer into sub-layers according to the set hydrogen index value interval corresponding to the sub-layer to be divided. The test cycle required for the measurement of kerogen carbon isotopes is long, so this method is the most economical and effective.

[0125] (2) Divide the subdivided target drilling layer into small layers according to the kerogen carbon isotope, including: dividing the target drilling layer into layers of organic matter types according to the measured kerogen carbon isotope values. Specifically, according to the measured kerogen carbon isotope values, the organic matter types are divided using a three-category four-division standard (type I, type II1, type II2, type III); then, the subdivided target drilling layer is divided into a number of (1, 2, 3, ..., n) layers vertically according to the divided organic matter types.

[0126] (3) According to the kerogen carbon isotope and hydrogen index, the sub-layers of the target drilling layer section that has been divided into sub-segments are divided into small layers, including: according to the measured kerogen carbon isotope value, the layer section of the target drilling layer section that has been divided into sub-segments is divided into organic matter types; because the value of the hydrogen index is closely related to the organic matter type when Ro is the same for different organic matter types, under normal circumstances, the hydrogen index of type I-type-II1-type-II2-type-III shale decreases in sequence. In other words, for the same target layer section of the same well, the larger the hydrogen index, the more it reflects the change in the organic sedimentary environment of the shale. Therefore, on the basis of the above-mentioned layer section division of organic matter type, the sub-layers can be further determined and divided according to the hydrogen index. For example, if there is a thick layer section in the layer section divided according to the organic matter type, it can be further subdivided according to the slight change of the hydrogen index, and the divided sub-layers are named from bottom to top as ①, ②, ③, ..., n.

[0127] Step S600, performing inter-well lateral sub-layer comparison of different drilling target layers in the study area, and establishing an isochronous comparison framework of different drilling target layers in the study area.

[0128] Specifically, according to the vertical variation law of organic matter type or hydrogen index of different target layers in the study area, the target layers of different drillings in the study area are compared horizontally between wells, and an isochronous comparison framework of different target layers in the study area is established. The isochronous comparison framework of target layers of different drillings in the study area can characterize the temporal and spatial distribution variation law of different small layers, thereby providing a reliable basis for the development deployment and development plan of continental shale oil and gas.

[0129] Embodiment 6

[0130] This embodiment provides a computer program product. When the computer program product is run on a processor, it executes the method for dividing and comparing continental shale oil and gas layers in the aforementioned embodiment.

[0131] In practical applications, the computer program product can be implemented and run in electronic devices.

[0132] The present embodiment implements a method for dividing and comparing continental shale oil and gas sublayers, which includes the following steps.

[0133] Step S100, obtaining the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer. Specifically, the lithology type identification result of each interlayer in the drilling target layer section and the thickness calibration result of each interlayer are obtained by observing the core of the drilling target layer section in the continental shale research area, identifying the lithology (such as sandstone, carbonate rock, tuff, etc.) of each interlayer in the drilling target layer section and calibrating the thickness of each interlayer.

[0134] Step S200, subdividing the target layer section for drilling into subsections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section. Different interlayer scales correspond to a thickness interval, for example: the interlayer with a thickness of ≥1m corresponds to a blocky scale, the interlayer with a thickness of [0.5m, 1m) corresponds to a thick layer scale, the interlayer with a thickness of [0.1m, 0.5m) corresponds to a medium layer scale, the interlayer with a thickness of [0.01m, 0.1m) corresponds to a thin layer scale, and the interlayer with a thickness of <0.01m corresponds to a laminar scale. For example, if there are more than two types of lithology in the interlayer, including sandstone, carbonate rock and tuff, it can be divided into sub-sections according to shale intercalated limestone section, shale intercalated sandstone section, shale intercalated limestone and sandstone section (sub-section one, sub-section two, sub-section three...); if there is only one type of interlayer, such as limestone, it can be divided into sub-sections according to shale intercalated thick limestone, shale intercalated thin limestone, shale intercalated laminated limestone, etc. (sub-section one, sub-section two, sub-section three...).

[0135] Step S300, determining the organic geochemical parameters of the shale in the target drilling layer, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope, rock pyrolysis hydrocarbon content, etc.

[0136] Among them, the Ro value is an important parameter in geology, usually used to describe the thermal evolution of source rocks. The Ro value is an indicator reflecting the maturity of organic matter in source rocks, and is used to determine whether the source has entered the oil generation or gas generation stage. Under normal circumstances, as the burial depth increases and the temperature rises, the maturity of organic matter in the rock (Ro value) gradually increases. When the Ro value enters the oil generation or gas generation window, the organic matter pyrolyzes or thermally cracks, producing a series of chemical reactions, and finally forming hydrocarbon compounds such as oil and gas. The higher the Ro value, the higher the maturity of the organic matter in the rock. Under certain conditions, the greater the oil and gas generation potential of the rock. In oil exploration, the Ro value is one of the important bases for evaluating the quality of source rocks, and has a key impact on the success of exploration.

[0137] Step S400, calculating the hydrogen index of the shale in the target drilling layer according to the amount of pyrolysis hydrocarbons in the rock. The hydrogen index is calculated using the following formula:

[0138] HI = (S2 × 100) / TOC;

[0139] Among them, HI is the hydrogen index, S2 is the amount of rock pyrolysis hydrocarbons, and TOC is the organic carbon content.

[0140] Step S500, based on the difference in Ro of the drilling target layer segment, select at least one of the hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0141] In some implementations, the step of selecting at least one of hydrogen index and kerogen carbon isotope to divide the target drilling layer into small layers according to the difference in Ro of the target drilling layer includes:

[0142] When the Ro of the drilling target layer segment is lower than the preset Ro threshold (in this embodiment, the Ro threshold is set to 1.3%), at least one of the hydrogen index and kerogen carbon isotope is selected to divide the drilling target layer segment that has been divided into sub-segments into small layers.

[0143] When the Ro of the target drilling layer is not lower than the preset Ro threshold, the hydrogen index of the shale has dropped to a lower value (HI < 100) with the continuous increase in the degree of thermal evolution. At this time, it is difficult to distinguish the differences between shales of different organic types based on the hydrogen index of the shale. Therefore, the target drilling layer that has been divided into sub-segments is divided into organic types vertically based on the measured kerogen carbon isotope values, and the divided small layers are named ①, ②, ③, ..., n from bottom to top.

[0144] The sub-layer division scheme specifically includes:

[0145] (1) Divide the sub-divided target drilling layer into sub-layers according to the hydrogen index, including: according to the numerical variation range of the hydrogen index of the target drilling layer, such as HI between 44 and 442 mg / g, set the hydrogen index value interval corresponding to the sub-layer to be divided, such as HI value <200 mg / g, HI value between 200 mg / g and 400 mg / g; divide the sub-divided target drilling layer into sub-layers according to the set hydrogen index value interval corresponding to the sub-layer to be divided. The test cycle required for the measurement of kerogen carbon isotopes is long, so this method is the most economical and effective.

[0146] (2) Divide the subdivided target drilling layer into small layers according to the kerogen carbon isotope, including: dividing the target drilling layer into layers of organic matter types according to the measured kerogen carbon isotope values. Specifically, according to the measured kerogen carbon isotope values, the organic matter types are divided using a three-category four-division standard (type I, type II1, type II2, type III); then, the subdivided target drilling layer is divided into a number of (1, 2, 3, ..., n) layers vertically according to the divided organic matter types.

[0147] (3) According to the kerogen carbon isotope and hydrogen index, the sub-layers of the target drilling layer section that has been divided into sub-segments are divided into small layers, including: according to the measured kerogen carbon isotope value, the layer section of the target drilling layer section that has been divided into sub-segments is divided into organic matter types; because the value of the hydrogen index is closely related to the organic matter type when Ro is the same for different organic matter types, under normal circumstances, the hydrogen index of type I-type-II1-type-II2-type-III shale decreases in sequence. In other words, for the same target layer section of the same well, the larger the hydrogen index, the more it reflects the change in the organic sedimentary environment of the shale. Therefore, on the basis of the above-mentioned layer section division of organic matter type, the sub-layers can be further determined and divided according to the hydrogen index. For example, if there is a thick layer section in the layer section divided according to the organic matter type, it can be further subdivided according to the slight change of the hydrogen index, and the divided sub-layers are named from bottom to top as ①, ②, ③, ..., n.

[0148] Step S600, performing inter-well lateral sub-layer comparison of different drilling target layers in the study area, and establishing an isochronous comparison framework of different drilling target layers in the study area.

[0149] Specifically, according to the vertical variation law of organic matter type or hydrogen index of different target layers in the study area, the target layers of different drillings in the study area are compared horizontally between wells, and an isochronous comparison framework of different target layers in the study area is established. The isochronous comparison framework of target layers of different drillings in the study area can characterize the temporal and spatial distribution variation law of different small layers, thereby providing a reliable basis for the development deployment and development plan of continental shale oil and gas.

[0150] In the several embodiments provided in the embodiments of the present invention, it should be understood that the disclosed apparatus and method can also be implemented in other ways. The apparatus and method embodiments described above are merely illustrative.

[0151] It should be noted that, in this article, the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0152] Although the embodiments disclosed in the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for dividing and comparing continental shale oil and gas layers, characterized in that: include: Obtain the lithology type identification results and thickness calibration results of each interlayer in the target drilling interval; The target layer section is divided into sub-sections according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer section, and each different scale corresponds to a thickness interval; Determine the organic geochemical parameters of the shale in the target layer of the drilling, wherein the organic geochemical parameters include TOC, Ro, kerogen carbon isotope and rock pyrolysis hydrocarbon content; Calculate the hydrogen index of the shale in the target drilling layer according to the pyrolysis hydrocarbon content of the rock; According to the difference of Ro of the drilling target layer segment, the drilling target layer segment which has been divided into sub-segments is divided into small layers according to at least one of hydrogen index and kerogen carbon isotope; The inter-well small layer lateral comparison is carried out for different drilling target layers in the study area, and an isochronous comparison framework for different drilling target layers in the study area is established.

2. The method for dividing and comparing continental shale oil and gas layers according to claim 1, characterized in that: When the Ro of the target drilling layer segment is lower than the preset Ro threshold, the target drilling layer segment that has been divided into sub-segments is divided into small layers according to at least one of the hydrogen index and kerogen carbon isotope.

3. The method for dividing and comparing continental shale oil and gas layers according to claim 1, characterized in that: When the Ro of the target drilling layer is not lower than the preset Ro threshold, the target drilling layer that has been divided into sub-segments is divided into organic matter types according to the kerogen carbon isotope.

4. The method for dividing and comparing continental shale oil and gas layers according to claim 1, characterized in that: The sub-layer division of the target drilling intervals that have been divided into sub-segments is carried out according to the hydrogen index and kerogen carbon isotope, including: The target layers of drilling are divided into organic matter types according to kerogen carbon isotopes; For layers of the same organic matter type, sub-layers are divided according to changes in the hydrogen index.

5. The method for dividing and comparing continental shale oil and gas sublayers according to claim 1, characterized in that: The sub-division of the target drilling intervals into sub-sections is carried out based on the kerogen carbon isotopes, including: Based on kerogen carbon isotopes, the three-category four-division standard is used to classify organic matter types; According to the divided organic matter types, the drilling target layer segment that has been divided into sub-segments is divided into small layers vertically.

6. The method for dividing and comparing continental shale oil and gas sublayers according to claim 1 or 2, characterized in that: The target drilling layer that has been divided into sub-segments is divided into small layers according to the hydrogen index, including: According to the numerical variation range of the hydrogen index of the target layer section, the numerical range of the hydrogen index corresponding to the sub-layer to be divided is set; According to the set hydrogen index value range corresponding to the sub-layer to be divided, the drilling target layer section that has been divided into sub-segments is divided into sub-layers.

7. The method for dividing and comparing continental shale oil and gas sublayers according to claim 1, characterized in that: According to the vertical variation law of organic matter type or hydrogen index in different drilling target layers in the study area, the different drilling target layers in the study area are compared horizontally among the wells.

8. A device for dividing and comparing continental shale oil and gas layers, characterized in that: include: The first processing module is used to obtain the lithology type identification results of each interlayer in the target layer section of the drilling and the thickness calibration results of each interlayer; The first layer segment division module is used to divide the target layer segment into sub-segments according to the combination relationship between shale and interlayers of different lithology types and different scales in the target layer segment, and each different scale corresponds to a thickness interval; A determination module is used to determine the organic geochemical parameters of shale in each sub-section of the target drilling layer, wherein the organic geochemical parameters include TOC, Ro and rock pyrolysis hydrocarbon content; A calculation module, used to calculate the hydrogen index of shale in the target drilling layer according to the amount of hydrocarbons in rock pyrolysis; The second layer segment division module is used to select at least one of hydrogen index and kerogen carbon isotope to divide the drilling target layer segment that has been divided into sub-segments into small layers according to the difference of Ro of the drilling target layer segment; The second processing module is used to perform inter-well small layer lateral comparison of different drilling target layers in the study area and establish an isochronous comparison grid of different drilling target layers in the study area.

9. An electronic device, characterized in that: The method comprises a memory and at least one processor, wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by at least one processor, the method according to any one of claims 1 to 7 is implemented.

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