Sedimentary basin type hot dry rock resource heat source mechanism analysis method

Abstract

The invention provides a sedimentary basin type hot dry rock resource heat source mechanism analysis method. The mechanism analysis method comprises the steps that S1, hot dry rock resource distribution of a geothermal abnormal area is preliminarily judged; s2, testing the stratum rock to obtain a stratum rock test result; s3, drawing a regional heat flow distribution diagram according to a regional ground temperature field analysis result and a stratum rock test result, performing heat flow distribution, and determining a ground curtain heat flow value; s4, establishing geothermal geological conceptual models of geothermal abnormal areas of various heat source types; and S5, on the basis of analysis of the geothermal geological conceptual model of the geothermal abnormal area, obtaining an optimal heat source composition for forming the sedimentary basin type hot dry rock resource. Various possible heat sources are superposed and fitted, the heat source mechanism of the sedimentary basin type hot dry rock resource is determined by taking an actually measured heat flow value as a limit, and a reliable basis is provided for selective evaluation of the hot dry rock resource.

Description

Technical Field

[0001] This invention relates to the field of geothermal geology, and in particular to a method for analyzing the heat source mechanism of dry hot rock resources in sedimentary basins. Background Technology

[0002] Geothermal resources are an important renewable and clean energy source, and my country ranks first in the world in terms of direct geothermal energy utilization. Hot dry rock refers to rock masses containing little or no fluid, with temperatures above 180°C, whose thermal energy can be utilized under current technological and economic conditions. Compared to hydrothermal geothermal resources, hot dry rock resources have higher temperatures and are more widely distributed; therefore, expanding the scale of geothermal resource development and utilization, and moving towards deeper geothermal resources, is an inevitable trend. Based on their formation mechanisms, hot dry rock resources can be mainly divided into high-radioactive heat-generating types, modern volcanic types, sedimentary basin types, and intensely tectonic zones. The heat sources of other types of hot dry rock resources are relatively simple; for example, the heat source of high-radioactive heat-generating types is rocks with high radioactive heat generation rates; the heat source of modern volcanic types is volcanic activity. However, the formation of sedimentary basin-type hot dry rock resources is more complex, resulting from the combined effects of multiple heat sources and multiple heat accumulation processes. Studying the heat source mechanism of sedimentary basin-type hot dry rock resources is the core work for hot dry rock resource exploration and site selection. Only in this way can the spatial distribution of hot dry rock reservoirs be accurately determined, which is of great significance for improving the energy structure of eastern my country and achieving the "dual carbon" target. Currently, there is no complete set of analytical methods for the heat source mechanism of hot dry rock resources, resulting in a lack of reliable basis for the site selection and evaluation of hot dry rock sources. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources to overcome or at least partially solve the above problems.

[0004] According to one aspect of the present invention, a method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources is provided, the method comprising:

[0005] Step S1: Preliminary assessment of the distribution of hot dry rock resources in the geothermal anomaly zone;

[0006] Step S2: Test the stratigraphic rocks and obtain the stratigraphic rock test results;

[0007] Step S3: Based on the regional geothermal field analysis results and stratigraphic rock test results, draw a regional heat flow distribution map, distribute the heat flow, and determine the mantle heat flow value;

[0008] Step S4: Establish geothermal geological conceptual models for geothermal anomaly zones with multiple heat source types;

[0009] Step S5: Based on the analysis of the geothermal geological conceptual model of the geothermal anomaly area, obtain the optimal heat source composition for determining the formation of sedimentary basin-type dry hot rock resources.

[0010] Optionally, step S1: Preliminary determination of the distribution of hot dry rock resources in the geothermal anomaly zone specifically includes:

[0011] Regional geothermal field analysis was conducted to delineate geothermal anomaly zones and preliminarily determine the distribution of hot dry rock resources in these zones.

[0012] Optionally, step S2: testing the formation rocks specifically includes: taking formation rock samples and testing the formation rocks.

[0013] Optionally, step S4: establishing a geothermal geological conceptual model for geothermal anomaly zones with multiple heat source types specifically includes:

[0014] Based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, geothermal geological conceptual models of geothermal anomaly zones with various heat source types were established.

[0015] Optionally, step S5: based on the geothermal geological conceptual model analysis of the geothermal anomaly area, obtaining the optimal heat source composition for determining the formation of sedimentary basin-type dry hot rock resources specifically includes:

[0016] Based on the analysis of geothermal geological conceptual models of geothermal anomaly zones with multiple heat source types, the heat source contributions of conductive heat flow, radioactive heat generation, mantle-derived fluids, and deep melts are determined to obtain the optimal heat source composition for the formation of sedimentary basin-type dry hot rock resources.

[0017] Optionally, the step of conducting regional geothermal field analysis, delineating geothermal anomaly zones, and preliminarily determining the distribution of hot dry rock resources in the geothermal anomaly zones specifically includes:

[0018] Obtain geothermal information, calculate geothermal gradient, draw geothermal gradient plane distribution map, delineate geothermal anomaly zones, determine the basement undulations and spatial distribution of hidden faults in geothermal anomaly zones, determine the geological elements of geothermal anomaly zones, and determine the basic heat source type of each geothermal anomaly zone based on the geological elements.

[0019] Optionally, the geothermal information specifically includes oilfield testing temperature data, coalfield roadway temperature data, geothermal wellhead temperature data, and borehole temperature data.

[0020] Optionally, the geological elements specifically include: tectonic morphology, stratigraphic lithology, and distribution of igneous rocks.

[0021] Optionally, the step of sampling and testing the stratigraphic rocks specifically includes:

[0022] Core samples were collected from well sites around the temperature measurement well, according to strata and lithology, to test thermophysical parameters.

[0023] Based on the lithology and thickness of the strata, the thermal conductivity and heat generation rate of the strata were calculated using the harmonic mean method. Igneous rock samples were collected from Mesozoic-Cenozoic outcrops or cores, and zircon U-Pb geochronological analysis was conducted to determine the time of magma intrusion or eruption.

[0024] Optionally, step S3: drawing a regional heat flow distribution map based on the regional geothermal field analysis results and stratigraphic rock test results, allocating heat flow, and determining the mantle heat flow value specifically includes:

[0025] Based on the regional geothermal field analysis results and the stratigraphic rock test results, the geothermal heat flow is calculated and a surface heat flow distribution map is compiled.

[0026] Based on the stratigraphic heat generation rate column, and using the stripping method, the heat flux of each stratigraphic unit in the tectonic uplift and depression areas is calculated, and the heat flow is distributed until the heat flux is basically consistent, thus obtaining the mantle heat flow value before the shallow redistribution of heat flow occurs.

[0027] Optionally, the heat source contribution of the geothermal geological conceptual model analysis of the geothermal anomaly zone based on multiple heat source types specifically includes:

[0028] After the geothermal geological conceptual model of the local thermal anomaly area is running stably, the heat flow data at the top of the model is extracted and compared with the measured surface heat flow data. The contribution ratio of the heat flux brought by the heat conduction in the uplift and depression areas to the total surface heat flow is calculated respectively.

[0029] Optionally, the analysis of the heat source contribution for radiogenerated heat in the geothermal anomaly zone based on the geothermal geological conceptual model of multiple heat source types specifically includes:

[0030] Based on the geothermal geological conceptual model of the geothermal anomaly area, which has completed the analysis of the heat source contribution of conductive heat flow, the radioactive heat generation rate parameters of each stratum are input, and the model is run again until it is stable. The heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. At this time, the heat flux at the top is the sum of the contributions of conductive heat flow and radioactive heat generation, and the heat source contribution ratio of radioactive heat generation is calculated.

[0031] Optionally, the analysis of the heat source contribution of mantle-derived fluids based on the geothermal geological conceptual model of geothermal anomaly zones with multiple heat source types specifically includes:

[0032] Based on the geothermal geological conceptual model of the geothermal anomaly area after the analysis of the heat source contribution of radiogenerated heat, the intrusion time and intrusion temperature of the mantle-derived fluid in the geological body are set. The model running time is the intrusion time. After the model runs, the impact of the magma intrusion during this period on the geothermal field is analyzed. If there are multiple magma intrusions, they are added to the model in sequence. After the run, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. The sum of the contributions of conductive heat flow and radiogenerated heat is subtracted to obtain the heat source contribution ratio of the mantle-derived fluid.

[0033] Optionally, the analysis of the heat source contribution of deep melt in the geothermal anomaly zone based on the geothermal geological conceptual model of multiple heat source types specifically includes:

[0034] Based on the geothermal geological conceptual model of the geothermal anomaly zone after the analysis of the heat source contribution of the mantle-derived fluid, if there is a melt in the deep part, the depth and temperature of the melt are set in the model. When the model runs out, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data to calculate the heat source contribution ratio of the deep melt.

[0035] This invention provides a method for analyzing the heat source mechanism of sedimentary basin-type hot dry rock resources. The method includes: Step S1: Preliminary assessment of the distribution of hot dry rock resources in geothermal anomaly areas; Step S2: Testing of stratigraphic rocks to obtain test results; Step S3: Drawing a regional heat flow distribution map based on regional geothermal field analysis results and stratigraphic rock test results, allocating heat flow, and determining mantle heat flow values; Step S4: Establishing a geothermal geological conceptual model of geothermal anomaly areas with multiple heat source types; Step S5: Analyzing the geothermal geological conceptual model of the geothermal anomaly areas to obtain the optimal heat source composition for the formation of sedimentary basin-type hot dry rock resources. By superimposing and fitting various possible heat sources, and limiting them with measured heat flow values, the heat source mechanism (composition and proportion) of sedimentary basin-type hot dry rock resources is determined, providing a reliable basis for the selection and evaluation of hot dry rock resources.

[0036] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1A flowchart illustrating a method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources, provided in an embodiment of the present invention;

[0039] Figure 2 This invention provides a study area with a geothermal gradient in the caprock and a geothermal anomaly zone.

[0040] Figure 3 This is a schematic diagram of the geometric subdivision of the model provided in an embodiment of the present invention;

[0041] Figure 4 The surface heat flow after conduction heat flow differentiation provided in the embodiments of the present invention;

[0042] Figure 5 The surface heat flow provided in this embodiment of the invention is the superposition of conductive heat and radioactive heat generation.

[0043] Figure 6 The surface heat flow provided in the embodiments of the present invention is the superposition of conductive heat, radioactive heat generation, and deep heat source. Detailed Implementation

[0044] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0045] The terms "comprising" and "having," and any variations thereof, in the specification, embodiments, claims, and drawings of this invention are intended to cover non-exclusive inclusion, such as including a series of steps or units.

[0046] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Example 1

[0048] like Figure 1 As shown in the embodiment of the present invention, the method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources includes the following steps:

[0049] Step 1: Conduct regional geothermal field analysis, delineate geothermal anomaly zones, and preliminarily determine the distribution of hot dry rock resources in the geothermal anomaly zones;

[0050] Step 2: Take samples of the stratigraphic rocks and test them;

[0051] Step 3: Based on the regional geothermal field analysis results and stratigraphic rock test results, draw a regional heat flow distribution map, distribute the heat flow, and determine the mantle heat flow value;

[0052] Step 4: Based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, establish geothermal geological conceptual models for geothermal anomaly zones with different heat source types;

[0053] Step 5: Based on the geothermal geological conceptual model of geothermal anomaly areas with different heat source types, analyze the heat source contributions of conductive heat flow, radioactive heat generation, mantle-derived fluids, and deep melts to obtain the optimal heat source composition for the formation of sedimentary basin-type dry hot rock resources.

[0054] In step 1, regional geothermal field analysis is performed to delineate geothermal anomaly zones and preliminarily determine the distribution of hot dry rock resources within these zones. Specifically:

[0055] Acquire various types of geothermal information, including but not limited to oilfield test temperature data, coalfield roadway temperature data, geothermal wellhead temperature data, and borehole temperature data, calculate geothermal gradient, draw geothermal gradient plane distribution map, and delineate geothermal anomaly zones.

[0056] Regional geological data needs to be collected. This can be done by relying on small-scale exploration data from oil fields, coal fields, and geological exploration departments within the study area, or by conducting geophysical exploration to delineate the spatial distribution of geothermal reservoirs, determine the basement undulations of geothermal fields, and the spatial distribution of hidden faults. For example, artificial seismic methods can accurately determine the location, occurrence, and structure of faults and geothermal reservoirs, while magnetotelluric methods can determine the location and scale of geothermal reservoirs, identify geological elements such as structural morphology, stratigraphic lithology, and distribution of magmatic rocks, and determine the basic heat source types of various geothermal anomaly zones, including combinations such as conductive heat flow + radioactive heat generation, and conductive heat flow + radioactive heat generation + residual magmatic heat.

[0057] In step 2, stratigraphic rock samples are taken and tested, specifically as follows:

[0058] Core samples were collected from well sites around the temperature measurement well, according to strata and lithology, and thermophysical parameters (including thermal conductivity, specific heat, radioactive heat generation rate, etc.) were tested. The thermal conductivity and heat generation rate of the strata were calculated using the harmonic mean method according to the different lithological thicknesses of the strata. Igneous rock samples were collected from Mesozoic-Cenozoic outcrops or cores, and zircon U-Pb geochronological analysis was conducted to determine the time of magma intrusion or eruption.

[0059] In step 3, a regional heat flow distribution map is drawn based on the regional geothermal field analysis results and stratigraphic rock test results to allocate heat flow and determine the mantle heat flow value. Specifically:

[0060] Based on the regional geothermal field analysis results and stratigraphic rock test results, the geothermal heat flow is calculated, and a surface heat flow distribution map is compiled. Based on the stratigraphic heat generation rate column and the exfoliation method, the heat flux of each stratigraphic layer in the tectonic uplift and depression areas is calculated, and the heat flow is distributed until the heat flux is basically consistent, thus obtaining the mantle heat flow value before the shallow redistribution of heat flow occurs.

[0061] In step 4, based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, geothermal geological conceptual models of geothermal anomaly zones with different heat source types are established, specifically as follows:

[0062] Using the data obtained in steps 1-3, a stratigraphic framework for the geothermal anomaly zone is established to reflect structural morphology, lithology, and other characteristics. A two-dimensional / three-dimensional geothermal geological model is then established, which is the geothermal geological conceptual model of the geothermal anomaly zone.

[0063] In step 5, the heat source contribution of conductive heat flow is analyzed based on the geothermal geological conceptual model of geothermal anomaly areas with different heat source types. Specifically:

[0064] Under the influence of geological structure and the thermal conductivity of different strata, the uniform heat flow in the deep mantle undergoes redistribution. After the geothermal geological conceptual model of the geothermal anomaly area stabilizes, the heat flow data at the top of the model is extracted and compared with the measured surface heat flow data. The contribution ratio of the heat flux brought by the heat conduction in the uplift and depression areas to the total surface heat flow is calculated respectively.

[0065] In step 5, the contribution of radioactive heat generation to geothermal anomaly zones is analyzed based on geothermal geological conceptual models of different heat source types. Specifically:

[0066] Based on the geothermal geological conceptual model of the geothermal anomaly area, which has completed the analysis of the heat source contribution of conductive heat flow, the radioactive heat generation rate parameters of each stratum are input, and the model is run again until it is stable. The heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. At this time, the heat flux at the top is the sum of the contributions of conductive heat flow and radioactive heat generation, and the heat source contribution ratio of radioactive heat generation is calculated.

[0067] If the top heat flux is equal to the surface heat flux at this point, then the heat source in this area is conductive heat flux and radioactive heat generation, and the composition ratio has been obtained. If it is still lower than the surface heat flux, then it is necessary to further determine the contribution of other heat sources, such as residual heat from magma and deep melt.

[0068] In step 5, the heat source contribution of mantle-derived fluids is analyzed based on the geothermal geological conceptual model of geothermal anomaly zones with different heat source types. Specifically:

[0069] Based on the geothermal geological conceptual model of the geothermal anomaly area after the analysis of the heat source contribution of radiogenerated heat, the intrusion time and intrusion temperature of the mantle-derived fluid in the geological body are set to allow it to dissipate heat. The model running time is the intrusion time. After the model runs, the impact of the magma intrusion during this period on the geothermal field is analyzed. If there are multiple magma intrusions, they are added to the model in sequence. After the run, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. The sum of the contributions of conductive heat flow and radiogenerated heat is subtracted to obtain the heat source contribution ratio of the mantle-derived fluid.

[0070] In step 5, the heat source contribution of the deep melt is analyzed based on the geothermal geological conceptual model of geothermal anomaly areas with different heat source types. Specifically:

[0071] Based on the geothermal geological conceptual model of the geothermal anomaly area after the analysis of the heat source contribution of the mantle-derived fluid, through deep structural analysis, deep geophysical exploration, etc., if there is a melt in the deep part, the depth and temperature of the melt are set in the model. In particular, the thermal conductivity of deep and large faults needs to be considered. When the model runs out, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data to calculate the heat source contribution ratio of the deep melt.

[0072] After the above analysis, the heat source composition and proportion of different geothermal anomaly blocks can be obtained, and the deep geothermal temperature distribution under the action of different heat sources can be clarified, thereby determining the optimal heat source composition for the formation of sedimentary basin-type dry hot rock resources.

[0073] This invention provides a method for analyzing the heat source mechanism of sedimentary basin-type hot dry rock resources. The method includes regional geothermal field analysis, delineation of geothermal anomaly zones, preliminary identification of the distribution of hot dry rock resources within these zones, sampling of stratigraphic rocks, testing of the stratigraphic rocks, drawing a regional heat flow distribution map based on the regional geothermal field analysis results and stratigraphic rock test results, allocating heat flow, determining mantle heat flow values, establishing geothermal geological conceptual models of geothermal anomaly zones with different heat source types based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, analyzing the heat source contributions of conductive heat flow, radioactive heat generation, mantle-derived fluids, and deep melts based on these models, and obtaining the optimal heat source composition for the formation of sedimentary basin-type hot dry rock resources. This method employs numerical simulation to superimpose and fit various possible heat sources, using measured heat flow values ​​as constraints, to determine the heat source mechanism (composition and proportion) of sedimentary basin-type hot dry rock resources, providing a reliable basis for the selection and evaluation of hot dry rock resources.

[0074] Example 2

[0075] This embodiment provides an analysis process for the heat source mechanism of a sedimentary basin-type dry hot rock resource block, specifically including the following steps:

[0076] (1) Geothermal field analysis. Collect oil test temperature data, conduct borehole temperature measurement, draw geothermal-depth distribution map, geothermal gradient map, geothermal heat flow map, etc., and analyze the horizontal and vertical distribution patterns of geothermal temperature. Figure 2 This is a map showing the distribution of geothermal gradient and geothermal anomaly zones in the study area.

[0077] (2) Formation thermal conductivity and heat generation rate testing. Rock samples of various strata and lithologies from typical exploration wells and outcrops were collected for thermal conductivity and heat generation rate testing. Formation thermal property data from literature and previous studies were also collected. The comprehensive thermal conductivity and heat generation rate of each stratum were obtained using a thickness-weighted average method based on the thickness ratio of different lithologies within the formation.

[0078] (3) Determine the mantle heat flux value before shallow heat redistribution occurs. Based on the stratigraphic distribution, stratigraphic heat generation rate, and surface heat flux in the uplift / depression areas, the heat flux of each stratigraphic layer is calculated using the "layer stripping method" to distribute the heat flux until the heat flux is basically consistent, and the mantle heat flux value is determined to be approximately 39 mW / m. 2 (Table 1)

[0079] Table 1 Calculation of residual heat flow in each section

[0080]

[0081] (4) Establish a geothermal geological conceptual model. A two-dimensional geothermal geological model, namely the geothermal anomaly zone conceptual model, was established based on the analysis of the tectonic morphology, stratigraphic lithology, and magmatic activity of the study area. No magmatic rocks were found, and the influence of residual heat from magmatic rocks was not considered. Possible heat sources in the study area were identified as mantle heat transfer, stratigraphic radioactive heat generation, and shallow melts.

[0082] (5) The ratio of conductive heat to radioactive heat generation. The heat transfer and heat accumulation processes of each heat source were simulated using COMSOL Multiphysics software. Figure 3 This refers to the geological model and subdivision in the software. The measured surface heat flow in the uplift area is 84 mW / m. 2 Without considering other factors, the mantle heat flow differentiates during conduction, with the heat flow reaching 42 mW / m in the bulge region. 2 , accounting for 50.0% ( Figure 4 After superimposing the stratigraphic heat generation rate, the surface heat flow in the uplifted area reaches 72 mW / m. 2 The contribution of radioactive heat generation is 30.5 mW / m 2 36.3W / m 2 ( Figure 5 The measured surface heat flow still differs from the actual surface heat flow. The surface heat flow resulting from the superposition of conductive heat, radioactive heat generation, and deep heat sources, such as... Figure 6 As shown.

[0083] (5) Thermal contribution of localized melt. Based on seismic data, a low-velocity, high-conductivity zone exists at depth, which is analyzed as a localized melt, serving as a deep heat source. After adding a constant heat source of 600℃ at the bottom of the numerical model, the surface heat flux reaches 84 mW / m. 2 Its heat contribution was 14.3%.

[0084] The heat source composition and composition ratio of the dry hot rock in this embodiment are obtained through the above steps.

[0085] Beneficial Effects: The present invention provides a method for analyzing the heat source mechanism of sedimentary basin-type hot dry rock resources. This method includes conducting regional geothermal field analysis, delineating geothermal anomaly zones, preliminarily identifying the distribution of hot dry rock resources in geothermal anomaly zones, sampling and testing stratigraphic rocks, drawing regional heat flow distribution maps based on the regional geothermal field analysis results and stratigraphic rock test results, allocating heat flow, determining mantle heat flow values, establishing geothermal geological conceptual models of geothermal anomaly zones with different heat source types based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, analyzing the heat source contributions of conductive heat flow, radioactive heat generation, mantle-derived fluids, and deep melts based on the geothermal geological conceptual models of geothermal anomaly zones with different heat source types, obtaining the optimal heat source composition for the formation of sedimentary basin-type hot dry rock resources, and using numerical simulation methods to superimpose and fit various possible heat sources, with measured heat flow values ​​as constraints, to determine the heat source mechanism (composition and proportion) of sedimentary basin-type hot dry rock resources, providing a reliable basis for the selection and evaluation of hot dry rock resources.

[0086] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources, characterized in that, The mechanism analysis methods include: Step S1: Preliminary assessment of the distribution of hot dry rock resources in the geothermal anomaly zone; Step S2: Test the stratigraphic rocks and obtain the stratigraphic rock test results; Step S3: Based on the regional geothermal field analysis results and stratigraphic rock test results, draw a regional heat flow distribution map, distribute the heat flow, and determine the mantle heat flow value; Step S4: Establish geothermal geological conceptual models for geothermal anomaly zones with multiple heat source types; Step S5: Based on the analysis of the geothermal geological conceptual model of the geothermal anomaly area, obtain the optimal heat source composition for determining the formation of sedimentary basin-type dry hot rock resources.

2. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 1, characterized in that, Step S1: Preliminary determination of the distribution of hot dry rock resources in the geothermal anomaly zone specifically includes: Regional geothermal field analysis was conducted to delineate geothermal anomaly zones and preliminarily determine the distribution of hot dry rock resources in these zones.

3. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 1, characterized in that, Step S2: Testing the formation rocks specifically includes: Take samples of the stratigraphic rocks and test them.

4. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 1, characterized in that, Step S4: Establishing a geothermal geological conceptual model for geothermal anomaly zones with multiple heat source types specifically includes: Based on the regional geothermal field analysis results, stratigraphic rock test results, and mantle heat flow values, geothermal geological conceptual models of geothermal anomaly zones with various heat source types were established.

5. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 1, characterized in that, Step S5: Based on the analysis of the geothermal geological conceptual model of the geothermal anomaly area, the optimal heat source composition for determining the formation of sedimentary basin-type dry hot rock resources is obtained, specifically including: Based on the analysis of geothermal geological conceptual models of geothermal anomaly zones with multiple heat source types, the heat source contributions of conductive heat flow, radioactive heat generation, mantle-derived fluids, and deep melts are determined to obtain the optimal heat source composition for the formation of sedimentary basin-type dry hot rock resources.

6. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 2, characterized in that, The process of conducting regional geothermal field analysis, delineating geothermal anomaly zones, and preliminarily determining the distribution of hot dry rock resources within these zones specifically includes: Obtain geothermal information, calculate geothermal gradient, draw geothermal gradient plane distribution map, delineate geothermal anomaly zones, determine the basement undulations and spatial distribution of hidden faults in geothermal anomaly zones, determine the geological elements of geothermal anomaly zones, and determine the basic heat source type of each geothermal anomaly zone based on the geological elements.

7. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 6, characterized in that, The geothermal information specifically includes oilfield test temperature data, coalfield roadway temperature data, geothermal wellhead temperature data, and borehole temperature data.

8. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 6, characterized in that, The geological elements specifically include: tectonic morphology, stratigraphic lithology, and distribution of igneous rocks.

9. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 2, characterized in that, The specific steps of sampling and testing the stratigraphic rocks include: Core samples were collected from well sites around the temperature measurement well, according to strata and lithology, to test thermophysical parameters. Based on the lithology and thickness of the strata, the thermal conductivity and heat generation rate of the strata were calculated using the harmonic mean method. Igneous rock samples were collected from Mesozoic-Cenozoic outcrops or cores, and zircon U-Pb geochronological analysis was conducted to determine the time of magma intrusion or eruption.

10. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 1, characterized in that, Step S3: Based on the regional geothermal field analysis results and stratigraphic rock test results, draw a regional heat flow distribution map, allocate heat flow, and determine the mantle heat flow value. Specifically, this includes: Based on the regional geothermal field analysis results and the stratigraphic rock test results, the geothermal heat flow is calculated and a surface heat flow distribution map is compiled. Based on the stratigraphic heat generation rate column, and using the stripping method, the heat flux of each stratigraphic unit in the tectonic uplift and depression areas is calculated, and the heat flow is distributed until the heat flux is basically consistent, thus obtaining the mantle heat flow value before the shallow redistribution of heat flow occurs.

11. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 5, characterized in that, The heat source contribution to the conduction heat flow analysis based on the geothermal geological conceptual model of geothermal anomaly zones with multiple heat source types specifically includes: After the geothermal geological conceptual model of the local thermal anomaly area is running stably, the heat flow data at the top of the model is extracted and compared with the measured surface heat flow data. The contribution ratio of the heat flux brought by the heat conduction in the uplift and depression areas to the total surface heat flow is calculated respectively.

12. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 5, characterized in that, The geothermal geological conceptual model analysis of geothermal anomaly zones based on multiple heat source types specifically includes the following heat source contributions for radiogenerated heat: Based on the geothermal geological conceptual model of the geothermal anomaly area, which has completed the analysis of the heat source contribution of conductive heat flow, the radioactive heat generation rate parameters of each stratum are input, and the model is run again until it is stable. The heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. At this time, the heat flux at the top is the sum of the contributions of conductive heat flow and radioactive heat generation, and the heat source contribution ratio of radioactive heat generation is calculated.

13. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 5, characterized in that, The geothermal geological conceptual model analysis of geothermal anomaly zones based on multiple heat source types specifically includes the following: Based on the geothermal geological conceptual model of the geothermal anomaly area after the analysis of the heat source contribution of radiogenerated heat, the intrusion time and intrusion temperature of the mantle-derived fluid in the geological body are set. The model running time is the intrusion time. After the model runs, the impact of the magma intrusion during this period on the geothermal field is analyzed. If there are multiple magma intrusions, they are added to the model in sequence. After the run, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data. The sum of the contributions of conductive heat flow and radiogenerated heat is subtracted to obtain the heat source contribution ratio of the mantle-derived fluid.

14. The method for analyzing the heat source mechanism of sedimentary basin-type dry hot rock resources according to claim 5, characterized in that, The geothermal geological conceptual model analysis of deep melts in geothermal anomaly zones based on multiple heat source types specifically includes: Based on the geothermal geological conceptual model of the geothermal anomaly zone after the analysis of the heat source contribution of the mantle-derived fluid, if there is a melt in the deep part, the depth and temperature of the melt are set in the model. When the model runs out, the heat flux data at the top of the model is extracted and compared with the measured surface heat flow data to calculate the heat source contribution ratio of the deep melt.

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