Method and device for researching influence of layered siderite on hydrocarbon generation effect

Abstract

The invention belongs to the technical field of oil and gas resource exploration, and discloses a method and a device for researching the influence of layered siderite on hydrocarbon generation effect, the method comprises the following steps: selecting a drilling well for revealing the development of siderite and hydrocarbon source rock in a research area, and carrying out core observation and description; establishing a siderite layer macroscopic logging earthquake identification template based on the logging response characteristics and the earthquake response characteristics; carrying out hydrocarbon source rock geochemical analysis on the shale sample close to the siderite development layer section, and carrying out a hydrocarbon generation thermal simulation experiment according to a geochemical analysis result; and analyzing the reaction mechanism of the siderite participating in hydrocarbon generation according to a hydrocarbon generation thermal simulation result. According to the method, the problem that the occurrence, color, development mode and the like of siderite accompanying with the hydrocarbon source rock in a layered manner are difficult to distinguish from the hydrocarbon source rock is solved, meanwhile, the action mechanism that the siderite affects the hydrocarbon source rock hydrocarbon generation process and the hydrocarbon generation amount in the oil and gas exploration evaluation process is well analyzed, and then the oil and gas resource evaluation credibility and the exploration effect are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas resource exploration, and in particular relates to a method and a device for studying the influence of layered siderite on hydrocarbon generation. Background Art

[0002] As a comprehensive carrier of the lithosphere, hydrosphere, biosphere and atmosphere, lake sedimentary organic matter is an important carrier for restoring the ancient continental environment. The siderite associated with it is one of the main mineral components in lake sediments, carrying key information about the iron cycle and carbon cycle. Siderite is an important iron-containing carbonate mineral, whose main component is FeCO3. It is relatively common in lake environments and usually coexists with source rock development strata, coal seams, etc. in the form of interlayers. In recent years, domestic and foreign scholars have conducted many studies on the development characteristics, genetic mechanism and formation environment of siderite. Its genetic mechanism has been the focus of long-term debate. The research work mainly focuses on the macroscopic and microscopic qualitative description of the occurrence of siderite, the discussion of the environment and process of siderite formation, and the physical and chemical reaction mechanism of siderite formation. In actual work, siderite associated with source rock development strata or coal seams in layered form has an effect on the hydrocarbon generation process, hydrocarbon generation rate and hydrocarbon production of source rocks during oil and gas exploration and evaluation. However, since its occurrence, color, development pattern and other characteristics are difficult to distinguish from source rocks, it is easily overlooked or not taken seriously during the research process. In this context, common methods such as geological and geophysical techniques for identifying such special lithologies may fail to identify or identify them inaccurately. At the same time, there are great challenges in evaluating the exploration potential of hydrocarbon-generating strata or the exploration potential of unconventional resources such as coal-derived gas, which in turn affects the evaluation of oil and gas resources and exploration results. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a method that combines well-seismic and experimental analysis techniques to study the influence of layered siderite associated with lake source rocks on hydrocarbon generation, so as to improve the credibility of resource volume and exploration potential evaluation of oil and gas basins.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for studying the effect of layered siderite on hydrocarbon generation, comprising:

[0006] Select the wells that reveal the development of siderite and source rocks in the study area, and conduct core observation and description;

[0007] According to the core observation and description, combined with the drilling logging curve, the logging response characteristics corresponding to the siderite development layer section are analyzed. Combined with the seismic data of the study area, the seismic response characteristics corresponding to the siderite development layer section are analyzed. Based on the logging response characteristics and seismic response characteristics, a macroscopic logging seismic identification template for the siderite layer is established to distinguish the siderite associated with the source rock in layered form.

[0008] The source rock geochemical analysis was conducted on the shale samples near the siderite development interval, and the hydrocarbon generation thermal simulation experiment was carried out based on the geochemical analysis results;

[0009] According to the results of thermal simulation of hydrocarbon generation, the reaction mechanism of siderite in hydrocarbon generation is analyzed.

[0010] Furthermore, core observation and description were carried out, including:

[0011] Observe and identify the macroscopic lithology, color, density, inclusions, pores, fracture development of the siderite layer and its contact relationship with the source rock.

[0012] Furthermore, the source rock geochemical analysis of the shale samples near the siderite development interval was carried out, including:

[0013] The source rock organic carbon content analysis, pyrolysis parameter analysis, organic matter maturity parameter analysis, and kerogen type analysis of shale samples were carried out.

[0014] Furthermore, the pyrolysis parameters include free hydrocarbons, cracked hydrocarbons, the content of CO2 during the pyrolysis of organic matter and the maximum pyrolysis peak temperature.

[0015] Furthermore, the drilling logging curve includes a natural gamma curve, an acoustic time difference curve, a deep lateral resistivity curve and a shallow lateral resistivity curve.

[0016] Furthermore, the seismic data includes two-dimensional or three-dimensional seismic data.

[0017] Furthermore, a hydrocarbon generation thermal simulation experiment is conducted based on the geochemical analysis results, including:

[0018] According to the results of geochemical analysis, source rock samples whose organic matter abundance and organic matter hydrocarbon evolution stage meet the preset conditions are screened for thermal simulation experiments on hydrocarbon generation.

[0019] Furthermore, the thermal simulation experiment of hydrocarbon generation is carried out according to the geochemical analysis results, and further includes:

[0020] A glass tube hydrocarbon generation thermal simulation experimental device was used to carry out hydrocarbon generation thermal simulation experiments on source rock samples under normal pressure conditions.

[0021] Furthermore, the thermal simulation experiment of hydrocarbon generation is carried out according to the geochemical analysis results, and further includes:

[0022] Preparation of kerogen based on source rock samples;

[0023] Kerogen was used as a sample for thermal simulation experiments on hydrocarbon generation, and kerogen with siderite added was used as a sample for control experiments.

[0024] Furthermore, the kerogen with siderite added was used as a sample for control experiments, including:

[0025] Isotope tracing of C in siderite.

[0026] Furthermore, based on the results of thermal simulation of hydrocarbon generation, the reaction mechanism of siderite in hydrocarbon generation is analyzed, including:

[0027] Based on the reaction traces of isotopes, the state of siderite and the chemical structure of the products at different temperature points are analyzed to determine the chemical process in which the inorganic carbon in siderite participates in the synthesis of organic matter.

[0028] In a second aspect, the present invention discloses a device for studying the effect of layered siderite on hydrocarbon generation, comprising:

[0029] The core observation and description module is used to select wells that reveal the development of siderite and source rocks in the study area and conduct core observation and description;

[0030] Well logging and seismic response feature establishment module is used to analyze the well logging response characteristics corresponding to the siderite development layer section according to the core observation and description, combined with the drilling well logging curve, and analyze the seismic response characteristics corresponding to the siderite development layer section in combination with the seismic data of the study area, and establish a macro-well logging seismic identification template for the siderite layer based on the well logging response characteristics and seismic response characteristics;

[0031] The hydrocarbon generation thermal simulation module is used to perform geochemical analysis of source rocks on shale samples near the siderite development interval and to conduct thermal simulation experiments on hydrocarbon generation based on the geochemical analysis results;

[0032] The siderite decomposition and hydrocarbon generation mechanism analysis module is used to analyze the reaction mechanism of siderite in hydrocarbon generation based on the results of hydrocarbon generation thermal simulation.

[0033] In a third aspect, the present invention discloses 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 program, the steps of the above-mentioned method for studying the influence of layered siderite on hydrocarbon generation are implemented.

[0034] In a fourth aspect, the present invention discloses a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the above-mentioned method for studying the influence of layered siderite on hydrocarbon generation are implemented.

[0035] Technical effects and advantages of the present invention:

[0036] 1. The present invention establishes a macroscopic logging seismic identification template for siderite layers based on logging response characteristics and seismic response characteristics, which is used to distinguish siderite associated with source rocks in layered form, solves the problem that the occurrence, color, development pattern, etc. of siderite associated with source rocks in layered form are difficult to distinguish from source rocks. At the same time, the invention better analyzes the mechanism of siderite affecting the hydrocarbon generation process and hydrocarbon production of source rocks during oil and gas exploration and evaluation, thereby improving the credibility of oil and gas resource evaluation and exploration results.

[0037] 2. When the distribution of regional siderite layers is unclear, the present invention can provide a method and device for studying the influence of layered siderite associated with lake source rocks on hydrocarbon generation based on key technical means such as drilling data, seismic data, geochemical analysis and normal-pressure hydrocarbon generation thermal simulation experiments, so as to lay a foundation for preliminary research on the influence of siderite development on source rocks in terms of their hydrocarbon generation potential and evolution, and whether the existence of siderite can be used as a sign of the development of high-quality source rocks.

[0038] 3. The method provided by the present invention conducts research directly based on the siderite revealed by drilling, and combines seismic data to determine the regional siderite identification signs and templates. At the same time, it applies normal pressure thermal simulation experiments, isotope tracing and other technologies to determine the siderite development model, providing a feasible technical method and research basis for the evaluation of lake source rock oil and gas resources associated with siderite, and has wide applicability.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flow chart of a method for studying the influence of layered siderite on hydrocarbon generation according to the present invention;

[0041] Figure 2 This is a core photo of a typical layered siderite symbiotic with source rocks in an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of macro-logging seismic identification template for siderite layer in an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of two sets of normal pressure thermal simulation parallel experimental results in an embodiment of the present invention;

[0044] Figure 5A schematic diagram of the chemical process of siderite decomposing and participating in hydrocarbon generation during thermal action in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of a device for studying the effect of layered siderite on hydrocarbon generation. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, the present invention provides a method for studying the influence of layered siderite on hydrocarbon generation, characterized in that it comprises:

[0048] Select the wells that reveal the development of siderite and source rocks in the study area, and conduct core observation and description;

[0049] According to the core observation and description, combined with the drilling logging curve, the logging response characteristics corresponding to the siderite development layer section are analyzed. Combined with the seismic data of the study area, the seismic response characteristics corresponding to the siderite development layer section are analyzed. Based on the logging response characteristics and seismic response characteristics, a macroscopic logging seismic identification template for the siderite layer is established to distinguish the siderite associated with the source rock in layered form.

[0050] The source rock geochemical analysis was conducted on the shale samples near the siderite development interval, and the hydrocarbon generation thermal simulation experiment was carried out based on the geochemical analysis results;

[0051] According to the results of thermal simulation of hydrocarbon generation, the reaction mechanism of siderite in hydrocarbon generation is analyzed.

[0052] In some embodiments of the present invention, core observation and description are performed, including:

[0053] Observe and identify the macroscopic lithology, color, density, contents, pores, fracture development of the siderite layer and its contact relationship with the source rock. In specific implementation, select a typical well that reveals a large number of siderite layers and interbedded deposits with source rocks as the target well location, and carry out core observation and description and related sample collection preparation.

[0054] In some embodiments of the present invention, a source rock geochemical analysis is performed on a shale sample near a siderite development interval, including:

[0055] The source rock organic carbon content analysis, pyrolysis parameter analysis, organic matter maturity parameter analysis, and kerogen type analysis of the shale samples are carried out. When selecting core or cuttings samples, in principle, source rock samples are selected at equal distances of 10-20 cm above and below the siderite layer for the same analysis and testing. Sampling can be flexibly carried out according to the actual core and cuttings conditions.

[0056] In some embodiments of the present invention, the pyrolysis parameters include free hydrocarbons, cracked hydrocarbons, the content of CO2 during the pyrolysis of organic matter, and the maximum pyrolysis peak temperature.

[0057] In some embodiments of the present invention, the drilling logging curves include natural gamma curves, sonic time difference curves, deep lateral resistivity curves and shallow lateral resistivity curves.

[0058] In some embodiments of the present invention, the seismic data include two-dimensional or three-dimensional seismic data. High-resolution seismic data is more conducive to identifying thin siderite layers. During the identification process, the quality of the seismic data is not limited, and analysis and judgment can be performed based on the existing data in the study area.

[0059] In some embodiments of the present invention, a hydrocarbon generation thermal simulation experiment is performed according to the geochemical analysis results, including:

[0060] According to the results of geochemical analysis, source rock samples whose organic matter abundance and organic matter hydrocarbon evolution stage meet the preset conditions are screened for thermal simulation experiments on hydrocarbon generation.

[0061] In some embodiments of the present invention, the hydrocarbon generation thermal simulation experiment is performed according to the geochemical analysis results, further comprising:

[0062] A glass tube hydrocarbon generation thermal simulation experimental device was used to carry out hydrocarbon generation thermal simulation experiments on source rock samples under normal pressure conditions.

[0063] In some embodiments of the present invention, the hydrocarbon generation thermal simulation experiment is performed according to the geochemical analysis results, further comprising:

[0064] Preparation of kerogen based on source rock samples;

[0065] Kerogen was used as a sample for thermal simulation experiments on hydrocarbon generation, and kerogen with siderite added was used as a sample for control experiments.

[0066] It should be noted that, considering that the siderite associated with lake source rocks often appears in thin layers under actual geological conditions and its scale is relatively small compared with the source rocks, corresponding kerogen was prepared for the experiment during the parallel control thermal simulation experiment.

[0067] In some embodiments of the present invention, kerogen with siderite added is used as a sample for a control experiment, including:

[0068] Isotope tracing of C in siderite.

[0069] In some embodiments of the present invention, the reaction mechanism of siderite participating in hydrocarbon generation is analyzed based on the results of thermal simulation of hydrocarbon generation, including:

[0070] Based on the reaction traces of isotopes, the state of siderite and the chemical structure of the products at different temperature points are analyzed to determine the chemical process in which the inorganic carbon in siderite participates in the synthesis of organic matter.

[0071] In a second aspect, the present invention discloses a device for studying the effect of layered siderite on hydrocarbon generation, such as Figure 6 As shown, including:

[0072] The core observation and description module is used to select wells that reveal the development of siderite and source rocks in the study area and conduct core observation and description;

[0073] Well logging and seismic response feature establishment module is used to analyze the well logging response characteristics corresponding to the siderite development layer section according to the core observation and description, combined with the drilling well logging curve, and analyze the seismic response characteristics corresponding to the siderite development layer section in combination with the seismic data of the study area, and establish a macro-well logging seismic identification template for the siderite layer based on the well logging response characteristics and seismic response characteristics;

[0074] The hydrocarbon generation thermal simulation module is used to perform geochemical analysis of source rocks on shale samples near the siderite development interval and to conduct thermal simulation experiments on hydrocarbon generation based on the geochemical analysis results;

[0075] The siderite decomposition and hydrocarbon generation mechanism analysis module is used to analyze the reaction mechanism of siderite in hydrocarbon generation based on the results of hydrocarbon generation thermal simulation.

[0076] In a third aspect, the present invention discloses 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 program, the processor implements any one of the steps of the above-mentioned method for studying the influence of layered siderite on hydrocarbon generation.

[0077] In a fourth aspect, the present invention discloses a computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the above-mentioned methods for studying the influence of layered siderite on hydrocarbon generation are implemented.

[0078] In order to better illustrate the present solution, the following embodiments are also provided.

[0079] Example

[0080] S1: Select a typical well that reveals a large number of siderite layers and interbedded with source rocks as the target well location, conduct core observation and description and relevant sample collection preparation, and focus on observing and identifying the macroscopic lithology, color, density, inclusions, pore and fracture development of the siderite layer, as well as the contact relationship between the siderite layer and the source rock, such as Figure 2 As shown, A: mudstone development section; B: mudstone with siderite layer; C: mud shale development section; D: mudstone with thin layer of volcanic ash; E: mudstone development section. The siderite in the well selected in this example is common in the source rock development section, and its appearance is similar to mudstone, but its density is significantly greater than that of the surrounding mudstone; the thickness of a single layer varies from 2 to 60 cm. The siderite in the mudstone is mostly in irregular block shape, with the long axis almost parallel to the stratum and clear boundaries with the top and bottom surrounding rocks; multiple cracks can be observed in the siderite layer section, which is partially filled with white bentonite;

[0081] S2: Based on the core observation and description, the logging response characteristics are analyzed in combination with the logging curves natural gamma (GR) curve, acoustic time difference (AC) curve, deep lateral resistivity (LLD) curve, and shallow lateral resistivity (LLS) curve. The selected logging curves include but are not limited to the above curves.

[0082] After determining the logging response characteristics, combined with the seismic data of the study area, according to the well-seismic calibration situation, find the seismic response characteristics corresponding to the siderite layer on the seismic data. The seismic data used include but are not limited to two-dimensional or three-dimensional seismic data. High-resolution seismic data is more conducive to identifying thin siderite layers. In the identification process, the quality of seismic data is not limited, and analysis and judgment can be carried out based on the existing data in the study area.

[0083] Based on the above logging response characteristics and seismic response characteristics, a logging and seismic identification template suitable for regional identification of siderite layers is established. Figure 3 The well logging seismic identification template for the siderite layer is established, such as Figure 3 As shown in the figure, from the well logging curve, the siderite layer corresponds to obvious natural gamma peaks and deep and shallow lateral resistivity peaks, but does not show obvious identification characteristics on the acoustic time difference curve; therefore, the determination of natural gamma and deep and shallow lateral resistivity curves can better identify the siderite layer; from the seismic profile, the typical siderite layer has obvious strong amplitude and strong continuous wave peak reflection characteristics on the seismic; in general, this chart can basically reflect the development characteristics of the siderite layer in the study area;

[0084] S3: dark mudstone samples were collected from top to bottom at equal distances of 10-20 cm above and below the siderite layer, and geochemical experimental analysis was carried out. The analysis items included source rock organic carbon content TOC, pyrolysis parameter analysis, organic matter maturity parameter Ro analysis, and kerogen type analysis, and the corresponding analysis results of source rock organic carbon content TOC, pyrolysis parameter, organic matter maturity parameter Ro, and kerogen type were obtained. The pyrolysis parameters included S1, S2, S3, and Tmax, where S1 was free hydrocarbon (mgHC / g rock), S2 was cracked hydrocarbon (mgHC / g rock), S3 was the CO2 content in the organic matter pyrolysis process (mgCO2 / g rock), and Tmax was the highest pyrolysis peak temperature (°C). The analysis results are shown in Table 1;

[0085] Table 1

[0086]

[0087]

[0088] S4: According to the geochemical experimental analysis results of the source rock samples of S2, the source rock samples that meet the conditions are screened for the hydrocarbon generation thermal simulation experiment. According to the evaluation criteria of Table 2 and Table 3, the samples with good or best organic matter abundance evaluation and immature or low-mature organic matter hydrocarbon evolution stage are selected as the hydrocarbon generation thermal simulation experiment samples; From the data in Table 1, it can be seen that the black mudstone samples in this embodiment are all low-mature samples, and the kerogen type is all type II1, but the TOC value of black mudstone sample 2 is the largest, so the black mudstone sample 2 is selected as the hydrocarbon generation thermal simulation experiment sample;

[0089] Table 2

[0090]

[0091] Table 3

[0092]

[0093] S5: A parallel control hydrocarbon generation thermal simulation experiment is conducted under normal pressure conditions using a glass tube hydrocarbon generation thermal simulation experimental device for the source rock sample selected in S4. During the experiment, a group of kerogens prepared according to the sample selected in step S4 are used for the experiment. At the same time, a certain amount of siderite is added to the same kerogen for a control group experiment. The mass ratio of kerogen to siderite is 50:1. At the same time, a carbon 18 isotope tracer is added to the control group experiment to analyze the decomposition of siderite and the reaction process mechanism involved in the generation of organic matter after the experiment.

[0094] Considering that siderite may undergo thermal decomposition at 200°C, the starting temperature of the thermal simulation is set to 150°C. In order to better simulate the entire process of natural gas and oil generation from source rocks, the end temperature of the simulation is set to 600°C.

[0095] It should be noted that, in specific implementation, the hydrocarbon generation thermal simulation experimental scheme can formulate a targeted experimental scheme and a ratio scheme of source rock samples and siderite according to the geological characteristics of the study area. The present invention does not make specific limitations on the selection of the hydrocarbon generation thermal simulation experimental scheme;

[0096] In this embodiment, a glass tube hydrocarbon generation thermal simulation experimental device was used to conduct a hydrocarbon generation thermal simulation experiment under normal pressure conditions. The experimental results are shown in FIG. Figure 4 As shown, the total amount of gaseous hydrocarbons (C 1-5 ), methane (C1) and total liquid hydrocarbons (C 6+ )’s output, Figure 4 In a, as the temperature increases, the gaseous hydrocarbon yield continues to increase, and the gaseous hydrocarbon yield of the group of samples with added siderite is higher than that of the control group experiment with a single kerogen sample; Figure 4 The increasing trend of methane content in b is consistent with that of gaseous hydrocarbons, and also increases with increasing temperature; Figure 4 c, as the temperature increases, the content of liquid hydrocarbons first increases, and then shows a downward trend as the temperature further increases after reaching a peak. The temperature corresponding to the peak of the liquid hydrocarbon yield of a group of samples with siderite added is lower than that of the control group experiment of a single kerogen sample. In the kerogen + siderite control group experiment, the total amount of gaseous hydrocarbons, methane production, and liquid hydrocarbon production are all higher than those of the pure kerogen hydrocarbon generation simulation experiment, indicating that in the kerogen hydrocarbon generation process, siderite has a positive catalytic effect on this process, and calculations show that the gaseous hydrocarbon yield is increased by 16%-24%. It is worth pointing out that in the process of generating liquid hydrocarbons, due to the catalytic effect of siderite, the entire liquid hydrocarbon generation process is advanced, which further shows that the presence of siderite can reduce the activation energy in the hydrocarbon generation reaction process, so that hydrocarbons are generated earlier and the yield is increased.

[0097] By tracing the reaction traces of carbon 18 isotopes in siderite, the state of siderite and the chemical structure of the products at different temperatures were analyzed, focusing on the carbon 18 isotope traces at four important temperature points: the starting temperature of siderite cracking at 200°C, the starting temperature of hydrocarbon generation at 350°C, the peak temperature of hydrocarbon generation at 500°C, and the final temperature of hydrocarbon generation at 600°C. The traces observed are as follows: Figure 5As shown in the figure, at the starting cracking temperature of siderite at 200°C, FeCO3 undergoes preliminary decomposition to generate FeO and CO2 gas. At this stage, CO2 gas shows heavy carbon-18 isotope characteristics, but at this temperature point, FeCO3 is not completely decomposed; at the starting temperature of hydrocarbon generation at 350°C, FeCO3 undergoes a thorough high-temperature cracking reaction to generate Fe, C and O2. At this stage, in addition to inorganic C showing heavy carbon-18 isotope characteristics, CH4 and chain alkanes also show heavy carbon-18 isotope characteristics; at the peak temperature of hydrocarbon generation at 500°C, small molecular organic matter and some chain alkanes undergo thermal cracking to generate gaseous hydrocarbons such as CH4, and CH4 shows heavy carbon-18 isotope characteristics; at the terminal temperature of hydrocarbon generation at 600°C, chain alkanes further undergo thermal cracking to generate gaseous hydrocarbons such as CH4, and CH4 at this time also shows heavy carbon-18 isotope characteristics.

[0098] In summary, the present invention conducts research directly based on the siderite revealed by drilling, combines seismic data to determine the regional siderite identification signs and templates, and at the same time, applies normal pressure thermal simulation experiments, isotope tracing and other technologies to determine the siderite development model, providing a feasible technical method and research basis for the evaluation of lake source rock oil and gas resources associated with siderite, which has wide applicability.

[0099] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for studying the effect of layered siderite on hydrocarbon generation, characterized in that: include: Select the wells that reveal the development of siderite and source rocks in the study area, and conduct core observation and description; According to the core observation and description, combined with the drilling logging curve, the logging response characteristics corresponding to the siderite development layer section are analyzed. Combined with the seismic data of the study area, the seismic response characteristics corresponding to the siderite development layer section are analyzed. Based on the logging response characteristics and seismic response characteristics, a macroscopic logging seismic identification template for the siderite layer is established. ， Used to distinguish siderite associated with source rocks in layers; Conducting source rock geochemical analysis on shale samples near the siderite development interval, and conducting a hydrocarbon generation thermal simulation experiment based on the geochemical analysis results; According to the results of thermal simulation of hydrocarbon generation, the reaction mechanism of siderite in hydrocarbon generation is analyzed.

2. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 1, characterized in that: The core observation and description includes: Observe and identify the macroscopic lithology, color, density, inclusions, pores, fracture development of the siderite layer and its contact relationship with the source rock.

3. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 1, characterized in that: The geochemical analysis of source rocks on the shale samples near the siderite development interval includes: The shale samples were analyzed for source rock organic carbon content, pyrolysis parameter analysis, organic matter maturity parameter analysis, and kerogen type analysis.

4. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 3, characterized in that: The pyrolysis parameters include free hydrocarbons, cracked hydrocarbons, the content of CO2 during the pyrolysis of organic matter and the highest pyrolysis peak temperature.

5. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 1, characterized in that: The drilling logging curves include natural gamma curves, acoustic time difference curves, deep lateral resistivity curves and shallow lateral resistivity curves.

6. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 1, characterized in that: The seismic data include two-dimensional or three-dimensional seismic data.

7. A method for studying the effect of layered siderite on hydrocarbon generation according to any one of claims 1 to 6, characterized in that: The thermal simulation experiment of hydrocarbon generation according to the geochemical analysis results comprises: According to the geochemical analysis results, source rock samples whose organic matter abundance and organic matter hydrocarbon-generating evolution stage meet the preset conditions are screened for hydrocarbon generation thermal simulation experiments.

8. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 7, characterized in that: The thermal simulation experiment of hydrocarbon generation according to the geochemical analysis results further includes: A glass tube hydrocarbon generation thermal simulation experimental device is used to carry out a hydrocarbon generation thermal simulation experiment under normal pressure conditions on the source rock sample.

9. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 8, characterized in that: The thermal simulation experiment of hydrocarbon generation according to the geochemical analysis results further includes: preparing kerogen based on the source rock sample; The kerogen was used as a sample for a thermal simulation experiment of hydrocarbon generation, and the kerogen with siderite added was used as a sample for a control experiment.

10. The method for studying the influence of layered siderite on hydrocarbon generation according to claim 9, characterized in that: The control experiment of using the kerogen added with siderite as a sample comprises: Isotope tracing of C in siderite.

11. A method for studying the influence of layered siderite on hydrocarbon generation according to claim 10, characterized in that: The reaction mechanism of siderite participating in hydrocarbon generation is analyzed based on the hydrocarbon generation thermal simulation results, including: Based on the reaction traces of the isotopes, the state of siderite at different temperature points and the chemical structure of the products are analyzed to determine the chemical process in which the inorganic carbon in the siderite participates in the synthesis of organic matter.

12. A device for studying the effect of layered siderite on hydrocarbon generation, characterized in that: include: The core observation and description module is used to select wells that reveal the development of siderite and source rocks in the study area and conduct core observation and description; The module for establishing well logging and seismic response characteristics is used to analyze the well logging response characteristics corresponding to the siderite development layer section according to the core observation and description, combined with the drilling well logging curve, and the seismic response characteristics corresponding to the siderite development layer section according to the seismic data of the study area, and establish a macro-logging seismic identification template for the siderite layer based on the well logging response characteristics and the seismic response characteristics; A hydrocarbon generation thermal simulation module is used to perform source rock geochemical analysis on shale samples near the siderite development interval and to perform a hydrocarbon generation thermal simulation experiment based on the geochemical analysis results; The siderite decomposition and hydrocarbon generation mechanism analysis module is used to analyze the reaction mechanism of siderite in hydrocarbon generation based on the results of hydrocarbon generation thermal simulation.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of a method for studying the influence of layered siderite on hydrocarbon generation as described in any one of claims 1 to 11 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for studying the influence of layered siderite on hydrocarbon generation as described in any one of claims 1 to 11 are implemented.

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