Dry hot rock resource exploration method

Abstract

The embodiment of the invention provides a hot dry rock resource exploration method, which comprises the following steps of: performing hot dry rock development investigation on an exploration target region, and determining seismic geological disaster characteristics and hot dry rock development conditions of the exploration target region; remote sensing geological survey is conducted on the exploration target area, and the geologic features of the hot dry rock are determined; on the basis of the arranged observation points and observation routes, geothermal geology survey is conducted on the exploration target area, and geothermal geology features of the hot dry rock are determined; geophysical logging is carried out on the measuring points in the exploration target area, and geophysical field characteristics of the exploration target area are determined according to logging data; carrying out geochemical survey on the rock sample of the exploration target area, and determining rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area; and forming a hot dry rock resource exploration report according to seismic geological disaster characteristics, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area.

Description

Technical Field

[0001] The invention relates to the field of hot dry rock resource exploration, and in particular to a hot dry rock resource exploration method. Background Art

[0002] Hot dry rock (HDR) is a high-temperature rock mass with a temperature generally greater than 180°C, buried thousands of meters deep, with no fluid or only a small amount of underground fluid inside. The composition of this rock mass can vary greatly, most of which are intermediate-acid intrusive rocks since the Mesozoic Era, but can also be metamorphic rocks from the Mesozoic and Cenozoic Era, or even massive sedimentary rocks of great thickness.

[0003] As a green, clean, safe and efficient high-temperature geothermal energy, hot dry rock resources are huge and widely distributed, and are a promising alternative energy source. Hot dry rock resources are buried deep, and conventional surface surveys have limited contribution to the delineation of hot dry rock target areas. How to systematically and efficiently explore hot dry rocks is the current research focus. Summary of the invention

[0004] The embodiment of the present invention provides a method for exploring hot dry rock resources, which can systematically and efficiently explore the hot dry rock resources in the exploration target area.

[0005] The embodiment of the present invention discloses a method for exploring hot dry rock resources, the method comprising: Conduct hot dry rock development surveys in the exploration target area to determine the seismic geological disaster characteristics and hot dry rock development conditions in the exploration target area; Conducting a remote sensing geological survey of the exploration target area to determine the hot dry rock geological characteristics of the exploration target area; Based on the arranged observation points and observation routes, a geothermal geological survey is conducted on the exploration target area to determine the hot dry rock geothermal geological characteristics of the exploration target area; Performing geophysical logging on the measurement points within the exploration target area, and determining the geophysical field characteristics of the exploration target area based on the logging data; Conducting geochemical surveys on rock samples in the exploration target area to determine the chemical properties, thermophysical parameters and mechanical parameters of the rocks in the exploration target area; A hot dry rock resource exploration report for the exploration target area is formed based on the seismic geological disaster characteristics, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area.

[0006] Optionally, the earthquake geological disaster characteristics include at least one of historical earthquake characteristics, fault activity characteristics, geological disaster types and levels, building seismic fortification capabilities, and the current status of lifeline projects.

[0007] Optionally, the hot dry rock development conditions include at least one of hot dry rock engineering development conditions, hot dry rock resource utilization conditions and infrastructure conditions; The hot dry rock engineering development conditions include at least one of the following: The topography and geomorphology of the exploration target area; The geological structure of the exploration target area; The type of rock and soil in the exploration target area; Development of engineering geological properties; Development project hydrogeological conditions; Development engineering geological issues; Environmental impact of development projects; The hot dry rock resource utilization conditions include at least one of the following: Demand for hot dry rock resources; Hot dry rock resource demand pattern; The infrastructure conditions include at least one of the following: Current land use situation; Site construction conditions; Water security level; Power generation grid connection conditions.

[0008] Optionally, the remote sensing geological survey of the exploration target area to determine the hot dry rock geological characteristics of the exploration target area includes: Based on the satellite image of the exploration target area, identifying the hot dry rock geological characteristics of the exploration target area; The hot dry rock geological characteristics include at least one of the following: Basic outline of geological structure; Active faults; Hidden structure; Topographic and geomorphic features; Spatial distribution of rock mass; Areas of abnormal surface temperature; Correlation between regional deep faults and surface thermal anomalies; Surface coverage information related to the hot dry rock development environment in the exploration target area.

[0009] Optionally, the observation route satisfies at least one of the following: Vertical topography, geological body boundaries and fault strike directions; Conduct lateral tracing along key boundaries and significant changes in topography; Along the extension direction of hot springs, spring blooms and alteration zones; Along the direction of natural cracks in the rock mass.

[0010] Optionally, the observation point is located in a survey area, and the survey area includes at least one of the following: Stratigraphic boundaries, faults, folds, joints and fissures, igneous rocks, typical outcrops and lithology and lithofacies change zones; The boundary of new tectonic activity and the place where natural geological phenomena develop; The deep stratigraphic structure and / or temperature field of the exploration target area.

[0011] Optionally, the exploration range of the geophysical logging is larger than the geothermal development and utilization construction range of the exploration target area, and the density of the measurement network composed of the measurement points corresponds to the working scale, and the measurement line composed of the measurement points is perpendicular to the structural trend of the exploration target area.

[0012] Optionally, the map scale of the geochemical survey is consistent with the scale of the geological survey.

[0013] Optionally, the rock chemical properties include at least one of the following: The chemical composition and content of the rock samples; The hydrochemical evolution process and groundwater runoff direction of the exploration target area; Stable isotopes and radioactive isotopes in the water of the exploration target area; Hydrothermal alteration minerals in the exploration target area; Stable isotopes and radioactive isotopes in the rock sample.

[0014] Optionally, the thermophysical property parameter includes at least one of the following: Density of hot dry rock reservoirs; Thermal conductivity of hot dry rock reservoirs; Heat generation rate in hot dry rock reservoirs.

[0015] The embodiments of the present invention include the following advantages: The embodiment of the present invention provides a method for prospecting hot dry rock resources, which can survey the characteristics of earthquake geological disasters, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the prospecting target area, and form a hot dry rock resource prospecting report. The embodiment of the present invention provides a systematic and efficient method for prospecting hot dry rock resources, which can comprehensively evaluate the hot dry rock resources in the prospecting target area, is conducive to revealing the distribution law, hot dry rock resource potential, development conditions, etc. of the hot dry rock resources in the prospecting target area, and provides a basis for the development of hot dry rocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 It is a flow chart of the steps of an embodiment of a method for prospecting hot dry rock resources of the present invention. DETAILED DESCRIPTION

[0018] 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 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.

[0019] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable when appropriate, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. In the embodiments of the present invention, the term "multiple" refers to two or more, and other quantifiers are similar.

[0020] Reference Figure 1 , shows a flowchart of a method for hot dry rock resource exploration according to an embodiment of the present invention, the method may include the following steps: Step 101: Conduct a hot dry rock development survey on the exploration target area to determine the seismic geological disaster characteristics and hot dry rock development conditions of the exploration target area.

[0021] Step 102: Conduct a remote sensing geological survey on the exploration target area to determine the hot dry rock geological characteristics of the exploration target area.

[0022] Step 103: Based on the arranged observation points and observation routes, a geothermal geological survey is conducted on the exploration target area to determine the hot dry rock geothermal geological characteristics of the exploration target area.

[0023] Step 104: perform geophysical logging on the measurement points in the exploration target area, and determine the geophysical field characteristics of the exploration target area based on the logging data.

[0024] Step 105: Conduct a geochemical survey on rock samples in the exploration target area to determine the chemical properties, thermophysical parameters and mechanical parameters of the rocks in the exploration target area.

[0025] Step 106: Form a hot dry rock resource exploration report for the exploration target area based on the earthquake geological disaster characteristics, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area.

[0026] Among them, hot dry rock (HDR) refers to high-temperature rock that is buried thousands of meters deep in the earth, contains no or only a small amount of fluid, has a temperature higher than 180°C, and has certain development value.

[0027] The exploration target area in the embodiment of the present invention, i.e., the hot dry rock resource exploration target area (HDR explorationtarget area), refers to an area where, based on the hot dry rock survey in the region and key areas, appropriate exploration methods are selected in a goal-oriented, problem-oriented and result-oriented manner to further conduct detailed investigation of geothermal geological conditions according to the needs of hot dry rock development and utilization.

[0028] Conduct a hot dry rock development survey on the exploration target area to determine the seismic geological hazard characteristics and hot dry rock development conditions of the exploration target area to evaluate whether the exploration target area is suitable for hot dry rock development. Exemplarily, the hot dry rock development survey on the exploration target area may include a hot dry rock development geological safety survey and a hot dry rock development and utilization conditions survey. Among them, the hot dry rock development geological safety survey is used to determine the seismic geological hazard characteristics of the exploration target area, and the hot dry rock development and utilization conditions survey is used to determine the hot dry rock development conditions of the exploration target area.

[0029] As an example, the scope of geological safety investigation for hot dry rock development should be no less than the project site and its extension of 25km. It should be carried out on the basis of geological investigation combined with earthquake geology. The main investigation tasks may include: 1) Determine the characteristics of historical earthquakes. For example, collect historical earthquake data within a radius of 150km from the exploration target area, including historical earthquake catalogs, focal mechanisms, historical earthquake intensities, proportions of buildings destroyed by historical earthquakes, seismogenic structures, etc., draw historical earthquake isoseismal lines, and determine the attenuation relationship of earthquake intensity.

[0030] 2) Active fault survey. For example, conduct regional active fault surveys to identify parameters such as the nature, amplitude, age, rate, and earthquake recurrence interval of fault activity since the Quaternary period. The survey accuracy and methods should comply with the requirements of Active Fault Detection (DB / T36072-2018).

[0031] 3) Earthquake geological disaster survey. The survey scope should be no less than 50km, including surface rupture, sand liquefaction, soft soil subsidence, rock and soil collapse, landslide and other geological disasters that may be caused by earthquakes. The survey accuracy and methods should comply with the provisions of the "Code for Geological Hazard Risk Assessment" (GB / T 40112-2021).

[0032] 4) Survey on seismic fortification capacity of buildings. For example, a sampling survey on seismic fortification capacity of buildings, major infrastructure and lifeline projects within 25km of the development site, including urban standard buildings, major infrastructure and lifeline projects, is conducted, with a sampling rate of 4%. A detailed survey is conducted on each building within 5km of the development site and within 100m on both sides of the unstable fault. The survey and evaluation methods can refer to the relevant seismic fortification capacity survey, and the survey can refer to GBT 19428-2014.

[0033] 5) Survey of lifeline projects. Among them, lifeline projects mainly include water supply and drainage system projects, power, gas and oil pipeline and other energy supply system projects, telephone and radio and television and other information communication system projects, large medical system projects and highway, railway and other transportation system projects, etc. The survey of lifeline projects can be carried out by field investigation and data collection, and the questionnaire is filled out.

[0034] The survey contents of the hot dry rock development and utilization conditions survey mainly include: 1) Engineering development conditions survey. For example, conduct development conditions surveys related to hot dry rock engineering activities, including surveys of topography, geological structure, rock and soil types and engineering geological properties, hydrogeological conditions, engineering geological problems, and development environmental impacts. The survey content and technical methods must meet the requirements of the "Technical Requirements for Engineering Geological Surveys" (DD 2019-06) and the "Technical Guidelines for Environmental Impact Assessment - Groundwater Environment" (HJ 610-2016).

[0035] 2) Survey of resource utilization conditions. For example, a regional hot dry rock resource demand survey is conducted, including resource demand and demand methods, such as power generation, greenhouses, heating, etc., to meet the multi-level and multi-objective comprehensive utilization of hot dry rock resources. The survey content and technical methods must meet the relevant provisions of the "Geothermal Resources Geological Exploration Specification" (GBT11615-2010), and the specific development data utilization conditions involving hot dry rock heat storage characteristics, exploitable resources, and power generation must meet the relevant requirements of this regulation.

[0036] 3) Infrastructure condition survey. For example, conduct an infrastructure condition survey for the target development site, including the current land use status, site construction conditions, water source security, power generation grid connection conditions and other existing infrastructure conditions, determine the initial investment cost of the development site, and determine the feasible conditions for the early stage of development.

[0037] Optionally, the earthquake geological disaster characteristics include at least one of historical earthquake characteristics, fault activity characteristics, geological disaster types and levels, building seismic fortification capabilities, and the current status of lifeline projects.

[0038] Optionally, the hot dry rock development conditions include at least one of hot dry rock engineering development conditions, hot dry rock resource utilization conditions and infrastructure conditions.

[0039] The hot dry rock engineering development conditions include at least one of the following: The topography and geomorphology of the exploration target area; The geological structure of the exploration target area; The type of rock and soil in the exploration target area; Development of engineering geological properties; Development project hydrogeological conditions; Development engineering geological issues; Environmental impact of development projects; The hot dry rock resource utilization conditions include at least one of the following: Demand for hot dry rock resources; Hot dry rock resource demand pattern; The infrastructure conditions include at least one of the following: Current land use situation; Site construction conditions; Water security level; Power generation grid connection conditions.

[0040] In the embodiment of the present invention, in addition to conducting a hot dry rock development survey on the exploration target area, a remote sensing geological survey can also be conducted on the exploration target area to determine the geological characteristics of the hot dry rocks in the exploration target area.

[0041] Among them, remote sensing geological survey is mainly used in the early stage of hot dry rock geological exploration, mainly based on the interpretation of medium and high resolution visible light and thermal infrared images. The interpretation results need to be verified by field routes and verified with ground surveys, geophysical and chemical exploration, drilling and other work. In the pre-research stage, the preliminary interpretation is completed to provide a basis and work direction for further hot dry rock geological surveys, and to provide basic data for the preparation of pre-maps and design survey plans; in the implementation of geothermal geological mapping, detailed interpretation is completed to enrich the ground hot dry rock geological survey work and verify the interpretation results and understanding.

[0042] For example, in the process of remote sensing geological survey of the exploration target area, the following hot dry rock geological problems can be identified and interpreted through the medium- and high-resolution visible light and thermal infrared images of the latest aerial and satellite images, and when necessary, hyperspectral image interpretation: 1) Identify the basic outlines of geological structures, active faults and concealed structures, especially active faults, signs of uplift and erosion activities, and zones with dense joints and fissures.

[0043] 2) Identify the topographic and geomorphic features of the study area, with a focus on Quaternary geomorphology.

[0044] 3) Identify the spatial distribution of intrusive bodies such as veins and dykes of different lithologies and contact boundaries, with a focus on igneous rocks related to hot dry rock heat sources.

[0045] 4) Identify areas of abnormal surface temperature, the location and range of surface thermal displays such as ground springs, spring groups, geothermal overflow zones, and hydrothermal alteration zones, and infer hidden structures.

[0046] 5) Determine the correlation between regional deep faults and surface thermal anomalies.

[0047] 6) Identify land cover information related to hot dry rock development environments, such as settlements, important facilities, and geological hazards.

[0048] It should be noted that medium to high-resolution visible light, thermal infrared, hyperspectral and other satellite or aerial images can be selected according to the scale of general survey areas, key areas, exploration target areas and development target areas. The image quality, data processing and interpretation accuracy must meet the other technical requirements of the remote sensing image products and remote sensing technology industry standards, and refer to DZ / T 0151 for implementation.

[0049] Optionally, the remote sensing geological survey of the exploration target area to determine the hot dry rock geological characteristics of the exploration target area includes: Based on the satellite image of the exploration target area, the hot dry rock geological characteristics of the exploration target area are identified.

[0050] The hot dry rock geological characteristics include at least one of the following: Basic outline of geological structure; Active faults; Hidden structure; Topographic and geomorphic features; Spatial distribution of rock mass; Areas of abnormal surface temperature; Correlation between regional deep faults and surface thermal anomalies; Surface coverage information related to the hot dry rock development environment in the exploration target area.

[0051] In an embodiment of the present invention, geothermal geological surveys can also be conducted on the exploration target area based on the arranged observation points and observation routes to determine the hot dry rock geothermal geological characteristics of the exploration target area. Among them, the observation points and observation routes can be determined based on the topography and landforms, geological body boundaries, etc. of the exploration target area. Exemplarily, the observation route should focus on controlling important topography and landforms, geological body boundaries, faults, and geothermal anomalies, and adopt a layout method that combines route crossing and lateral tracking. The observation points should focus on active structures, geothermal displays, deep holes, and reservoir rock mass geological surveys.

[0052] Optionally, the observation route satisfies at least one of the following: Vertical topography, geological body boundaries and fault strike directions; Conduct lateral tracing along key boundaries and significant changes in topography; Along the extension direction of hot springs, spring blooms and alteration zones; Along the direction of natural cracks in the rock mass.

[0053] Optionally, the observation point is located in a survey area, and the survey area includes at least one of the following: Stratigraphic boundaries, faults, folds, joints and fissures, igneous rocks, typical outcrops and lithology and lithofacies change zones; The boundary of new tectonic activity and the place where natural geological phenomena develop; The deep stratigraphic structure and / or temperature field of the exploration target area.

[0054] Among them, the deep stratigraphic structure and / or temperature field of the exploration target area may include boreholes, machine wells, civil wells, mines, tunnels, etc.

[0055] Geothermal geological survey is mainly used to clarify fault structures, Quaternary volcanic activities, natural fissure characteristics, geological body composition and structure, spatial contact relationship, hot springs, spring blooms, altered surface thermal displays, etc. Geothermal geological survey work should be carried out on the basis of remote sensing interpretation and regional geological survey data.

[0056] It should be noted that different levels of survey accuracy can refer to the requirements of geothermal geological surveys or hydrogeological surveys of the same scale.

[0057] The hot dry rock geothermal geological characteristics may include, but are not limited to, at least one of the geothermal gradient of the exploration target area, the scope of the geothermal anomaly area, and the thermal structure information of the lithosphere.

[0058] In addition, geophysical logging can be performed on the measuring points within the exploration target area, and the geophysical field characteristics of the exploration target area can be determined based on the logging data.

[0059] It should be noted that geophysical logging of the survey points within the exploration target area is the main means of realizing geophysical exploration of the exploration target area. Geophysical exploration is mainly used to determine the appropriate geophysical exploration technical methods and method combinations according to the target tasks of different investigation accuracy of hot dry rocks, as well as the geological and geophysical data collected in the work area, combined with on-site surveys and forward and inverse simulation analysis, to clarify the technical work content and workload of geophysical methods. Geophysical exploration methods may include but are not limited to: electromagnetic sounding, radioactive material monitoring, temperature measurement, microseismic monitoring, electromagnetic monitoring, etc.

[0060] The collection of geophysical exploration data should adopt a working method that combines sparse network area measurement with high-precision profile measurement. The technical design requirements are as follows: 1) Survey point design: Avoid deploying natural field source electromagnetic depth sounding methods in areas with severe electromagnetic interference and human interference, and do not deploy natural field source ground magnetic exploration work in industrial areas, residential areas and building distribution areas.

[0061] 2) Accuracy design: According to the burial depth and possible scale of the detection target, the measurement data accuracy that the geophysical exploration method should achieve is designed, and the accuracy indicators and quality inspection methods are determined according to the corresponding geophysical exploration method standards.

[0062] 3) Design of survey network and survey line: The designed scope of geophysical exploration work should be larger than the scope of geothermal development and utilization, and should be as regular and continuous as possible; the density of the survey network should correspond to the working scale; the survey line should be as perpendicular to the main structural direction as possible, and the precise survey profile should pass through known boreholes and planned boreholes.

[0063] 4) Technical parameter design: Design the model based on data analysis and on-site survey results, and determine the relevant technical parameters through theoretical calculations of the model and on-site test results.

[0064] 5) Physical property work design: The collection and measurement of rock samples should cover all periods and various rock types.

[0065] 6) Geodetic work design: should comply with the requirements of the corresponding geophysical exploration method standards; 7) The actual workload of geophysical methods should meet the requirements of corresponding scale and detection depth; the subsequent drilling work should include design content of anomaly verification and re-interpretation.

[0066] Field construction, data processing and interpretation of geophysical survey data collection shall meet the following technical requirements: a) Gravity surveys at a scale of 1:50000 and smaller should comply with the requirements of DZ / T 0004.

[0067] b) Area gravity survey and profile gravity survey with a scale greater than 1:50000 shall comply with the requirements of DZ / T 0171.

[0068] c) Ground magnetic exploration should comply with the requirements of SY / T 5819.

[0069] d) Magnetotelluric sounding exploration should comply with the requirements of SY / T 5820.

[0070] e) Time-frequency electromagnetic exploration should comply with the requirements of SY / T 6688.

[0071] f) Wide-area electromagnetic exploration should comply with the requirements of DB43 / T 1460.

[0072] g) Artificial seismic exploration should comply with the requirements of GB / T 33583.

[0073] h) Radioactive measurement shall refer to the requirements of EJ / T 605.

[0074] i) Physical property rock sample collection shall refer to the requirements of DD 2006.

[0075] j) Field records should be clear and complete; magnetic and electromagnetic sounding methods should record detailed information on interference around the measuring points.

[0076] k) Data collation should be carried out in a timely manner on site, including: elimination of erroneous data, calculation of various correction values, error calculation and statistics, data gridding, etc. Data collation should be compared with the original records.

[0077] l) According to the project tasks, geological characteristics of the work area, and geophysical data, appropriate processing methods and software should be used to process geophysical exploration data, suppress or eliminate interference and noise, highlight or extract relevant information, and form geophysical signals that reflect geothermal elements that are easy to identify and interpret.

[0078] m) Prepare the geological-geophysical comprehensive interpretation results profile and plane map based on the qualitative, quantitative and comprehensive interpretation and inference results. At the same time, evaluate the reliability of the interpretation results and explain the possible problems and deficiencies. The reliability is graded as: reliable, relatively reliable, referenceable and unreliable.

[0079] Optionally, the exploration range of the geophysical logging is larger than the geothermal development and utilization construction range of the exploration target area, and the density of the measurement network composed of the measurement points corresponds to the working scale, and the measurement line composed of the measurement points is perpendicular to the structural trend of the exploration target area.

[0080] The geophysical field characteristics of the exploration target area may include the stratigraphic structure, fault structure, local melting, heat reservoir characteristics, deep heat source, fracturing fluid, alteration, intrusion, basement undulation, Moho surface, etc. of the exploration target area.

[0081] In addition, geochemical surveys can be conducted on rock samples in the exploration target area to determine the rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area. Among them, rock samples can be obtained through hot dry rock geological drilling.

[0082] It should be noted that geochemical surveys mainly include investigation and analysis of geothermal fluid-specific components (F, SiO2, B, H2S, etc.) and radon gas measurements, etc., combined with geothermal geological surveys and geophysical explorations to determine the distribution range and temperature gradient of dry hot rock bodies. The contents and requirements of geochemical surveys are as follows: a) The scale of geochemical survey maps is consistent with that of geological survey maps.

[0083] b) For representative geothermal fluids, it is advisable to collect geochemical samples, analyze the differences and relationships of the main chemical compositions, trace the hydrochemical evolution process and groundwater runoff direction, and infer the lithology of deep thermal reservoirs.

[0084] c) Determine the stable isotopes and radioactive isotopes in representative geothermal fluids, atmospheric precipitation, surface water, and room-temperature groundwater to infer the origin and age of geothermal fluids.

[0085] d) Sampling and identification of hydrothermal alteration minerals in surface rocks and geothermal drilling cores, and analysis and inference of geothermal activity characteristics and evolution history.

[0086] e) Determine the stable isotopes and radioactive isotopes of typical rock samples, analyze the rock genesis and age, and calculate the heat production.

[0087] When conducting hot dry rock geological drilling in the exploration target area, the principles for drilling site selection are as follows: a) Hot dry rock geological drilling should be reasonably arranged according to the development and utilization needs of hot dry rock resources and specific drilling targets.

[0088] b) The layout of boreholes should be carried out on the basis of existing geothermal geological surveys and geophysical explorations, and combined with factors such as the geological structure, structural characteristics, temperature and geostress of different geological units, it should be able to meet the needs of identifying the occurrence conditions of hot dry rock resources, carrying out hot dry rock resource evaluation and special tasks.

[0089] c) When arranging and determining the drilling positions, the following aspects should be given priority: 1) Geological analysis, geophysical interpretation, and locations where results need to be verified; 2) The geological conditions such as stratum structure, structural framework, geostress, and natural fractures should be relatively clear; 3) The reservoir rock mass has good resource conditions; 4) No or low environmental risk; 5) Locations with good infrastructure, terrain, and other conditions such as transportation.

[0090] d) Hot dry rock geological drilling holes should be laid out as far as possible in accordance with the principle of "combining exploration and production, and using one hole for multiple purposes", with a clearer exploration and development planning route. If conditions permit, the wells can be drilled in accordance with the requirements of production wells or monitoring wells.

[0091] The hole depth of hot dry rock geological drilling should be determined according to the drilling target, reaching or passing through the hot dry rock target reservoir, and comprehensively judged according to the geothermal geological conditions of the hot dry rock development site, the location of the reservoir section and the development and utilization conditions. The hole diameter should be determined according to factors such as the drilling target, type, formation, logging requirements, and subsequent development and utilization plans. The core sampling should meet the following requirements: a) The upper cover layer does not need to be cored; b) Take cores at the upper part of the target layer or at key layers after entering the target layer. The cores can be taken at uniform intervals, preferably at intervals of 100 to 200 meters; c) Coring should be carried out according to geological requirements, and more frequent coring should be carried out in layers with obvious lithology or structural changes; d) The core of the reservoir section should be able to accurately reflect the original structure of the rock mass. The core sampling rate should not be less than 70%, and the core diameter should not be less than φ60mm.

[0092] The logging of hot dry rock geological drilling should accurately reflect the changes in stratum lithology and structure. The comprehensive mud logging method should be used to log the entire well section. The specific logging project requirements are as follows: a) Cuttings logging: Collect cuttings according to the well section and sampling interval required by the geological design. The sampling interval in the reservoir section is preferably 2 to 5 meters, and the sampling weight is not less than 500g; b) Well logging during drilling, recording well depth, drilling time, footage, etc.; c) Drilling fluid logging, recording drilling fluid properties, inlet and outlet temperatures, leakage, gushing, etc.; d) For exploration and production combined wells, engineering logging can be added to record drilling pressure, rotary table speed, pump pressure, etc.

[0093] Well logging for hot dry rock geological drilling should meet the needs of hot dry rock geological drilling. The specific requirements are as follows: a) Effectively identify lithology, divide strata, and meet stratigraphic comparison requirements; b) Quantitatively obtain continuous well temperature. After completion of the well, it is advisable to obtain continuous well temperature data for 3, 7, and 14 days; c) Obtain porosity, permeability, geostress and other geological parameters; d) Ability to evaluate fractures, wellside structures, etc.; e) Well logging items should include well diameter, continuous well deviation, natural gamma, natural potential, double-sided phase-microsphere focusing, acoustic wave, well temperature, and optional microresistivity imaging, array acoustic imaging, compensated neutron, and compensated density.

[0094] During the geochemical investigation of rock samples in the exploration target area, the radioactivity intensity of rock samples can be measured simultaneously. The purpose and content of the test analysis are as follows: 1) Determination of stratigraphic geological information: isotope age, paleomagnetism, micropaleontology, fossils, pollen, minerals and other tests to determine the stratigraphic age and lithology.

[0095] 2) Rock thin sections are used to identify hydrothermally altered minerals and study their evolution process. If mineral inclusions are found, their temperature can be measured.

[0096] 3) Rock heat generation rate test: the content of radioactive elements such as U, Th, and 40K in rocks.

[0097] 4) Restoration of tectonic evolution history and thermal history: apatite fission tracks, zircon hafnium isotopes and uranium-lead isotopes, etc.

[0098] In addition, the rock mechanics and physical properties of rock samples can also be analyzed, for example, the stress, strain, damage, stability and other properties of rocks under the action of external factors (such as load, water flow, temperature change, etc.). The purpose and content of the test analysis are as follows: a) Rock strength tests: uniaxial compressive and tensile strength, shear strength, triaxial compressive strength.

[0099] b) Rock deformation test: uniaxial compression deformation, repeated loading deformation, triaxial compression deformation, and shear deformation test.

[0100] c) In areas with relatively rich hot dry rock resources, it is advisable to test and analyze the mechanical properties of rocks, and select areas suitable for hot dry rock engineering development.

[0101] d) Determine the thermal properties of surface rocks and geothermal drilling cores, and evaluate the regional geothermal resources based on the thermal anomaly background.

[0102] e) Determination of physical and chemical properties of heat reservoirs and representative caprocks: rock major and trace testing, thermal physical property testing, electrical conductivity, porosity, permeability testing, and fixed-depth temperature measurement, etc.

[0103] Furthermore, hydrological (gas) geochemical analysis can also be conducted on the exploration target area. Hydrological geochemical analysis should focus on analyzing hot springs, boiling springs, fumaroles and other high-temperature fluids and gases to obtain parameters related to dry hot rock and geothermal fluids. The purpose and content of the test analysis can include at least one of the following: a) Analyze the source of geothermal fluid recharge and runoff pattern, and take samples along the groundwater runoff direction according to the water chemical profile: main anions ( ), cations (K + 、Na + , Ca 2+ Mg 2+ ); b) Calculate the heat reservoir temperature and geothermal fluid circulation depth, and take samples according to the requirements of relevant geochemical thermometers: F, Br, I, SiO2, B, H2S, Al, Pb, Cs, Fe, Mn, Li, Sr, Cu, Zn, SiO2, etc.; c) Analysis of hot dry rock heat source mode, heat reservoir type, development environment evaluation and calculation of heat reservoir temperature, etc., requires gas analysis: including CO2, H2S, HCl, H2, O2, CH4, N2, Hg, As, He, Ar, Rn, etc.; d) Monitoring the radioactivity intensity of hot dry rock mining circulation hydrothermal fluids: U, Ra, Rn, 40 K and total α, total β, etc.; e) Tracing the source, age, and formation environment of groundwater should include isotope testing. Isotopes: 2 H. 11 B. 3 H. 14 C. 13 C. 18 O. 34 S. 87 Sr et al. f) Test the temperature and pressure of the water-steam mixture at the wellhead, and calculate the enthalpy, water flow ratio and gas component concentration in the reservoir fluid; g) Test the scaling components, rate and location of scaling through blowdown test of geothermal wells; h) Environmental impact monitoring of circulating geothermal fluids in hot dry rock mining, analysis of toxic components: cadmium and cadmium compounds, mercury and mercury compounds, hexavalent chromium compounds, lead and lead compounds, arsenic and arsenic compounds, chloroform, trichloroethylene, tetrachloroethylene, formaldehyde, etc.; analysis of organic matter: volatile organic matter, semi-volatile organic matter, etc. in water.

[0104] Optionally, the map scale of the geochemical survey is consistent with the scale of the geological survey.

[0105] Optionally, the rock chemical properties include at least one of the following: The chemical composition and content of the rock samples; The hydrochemical evolution process and groundwater runoff direction of the exploration target area; Stable isotopes and radioactive isotopes in the water of the exploration target area; Hydrothermal alteration minerals in the exploration target area; Stable isotopes and radioactive isotopes in the rock sample.

[0106] Optionally, the thermophysical property parameter includes at least one of the following: Density of hot dry rock reservoirs; Thermal conductivity of hot dry rock reservoirs; Heat generation rate in hot dry rock reservoirs.

[0107] Optionally, the mechanical parameters may include stress state of hot dry rock, pressure field, thermal reservoir stress strain, uniaxial compressive and tensile strength, shear strength, triaxial compressive strength, and the like.

[0108] Finally, based on the seismic geological disaster characteristics, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area, a hot dry rock resource exploration report for the exploration target area can be generated.

[0109] Furthermore, a hot dry rock resource database of the exploration target area can be constructed based on the hot dry rock resource exploration report and various data and information generated during the investigation process. For example, the hot dry rock resource database may include at least one of the following: a) Original data database: including working base map and mapping data; field remote sensing interpretation data; geophysical, geochemical and drilling acquisition data; test data; monitoring data; work process records and other related data documents.

[0110] b) Results database: including various types of maps and spatial databases such as actual material maps, physical and chemical remote sensing results maps, drilling column maps, special research maps, numerical modeling tests, etc.; analytical data such as hot dry rock resource evaluation, development environmental impact assessment, target area optimization evaluation, development and utilization evaluation; results reports and special research reports, etc.

[0111] It is understandable that the construction of a hot dry rock resource database needs to meet the following requirements: a) Database construction runs through the entire process of hot dry rock geological survey, and the database construction process is consistent with the specific work process.

[0112] b) The construction of databases in different work phases should be completed in the corresponding phases to ensure the consistency and inheritance of the data.

[0113] c) The database construction standard shall refer to the "Digital Geological Map Spatial Database" (DD2006-06), and the metadata database shall be implemented in accordance with the "Geological Information Metadata Standard" (DD2006-05).

[0114] d) A unified coordinate system should be adopted to carry out data collection and storage based on a unified spatial geographic information data structure.

[0115] e) The database should be built using digital geological survey system and related database software.

[0116] f) Database acceptance is synchronized with field acceptance, and the acceptance content includes data content and data quality.

[0117] In addition, in the embodiment of the present invention, based on the exploration results of the exploration target area, a hot dry rock favorable area (HDR favorable area) and a hot dry rock development target area (HDR development target area) can be determined from multiple exploration target areas. The hot dry rock favorable area refers to an area with potential development value that is preliminarily determined by the hot dry rock resource survey. The hot dry rock development target area refers to an area that, based on the exploration of the hot dry rock resource exploration target area, is guided by the development and utilization of hot dry rocks, identifies the distribution of natural fractures and the direction of ground stress in the proposed artificial heat storage area, serves the construction of the artificial heat storage, and evaluates the geology and environment that affect the development.

[0118] During the investigation process, the investigation and evaluation of hot dry rock resources can be deployed in an orderly manner from regional to local, from unknown to known and with different precisions. In areas with simple hot dry rock geothermal geological conditions, the investigation and evaluation of hot dry rock resources can be appropriately combined. At different stages of the investigation, the investigation accuracy can be different, for example, the four different stages of regional hot dry rock geothermal geological survey (1:500000~1:250000), hot dry rock geothermal geological survey in key areas (1:50000), detailed investigation of hot dry rock geothermal geological exploration in exploration target areas (1:25000~1:10000) and detailed exploration of development target areas (1:5000~1:1000).

[0119] The survey contents and work requirements at different stages are also different. Among them, the regional hot dry rock geothermal geological survey is mainly based on data collection, remote sensing interpretation and small-scale geothermal geological mapping; the hot dry rock geothermal geological survey in key areas is mainly based on regional geophysical exploration and small and medium-scale geothermal geological mapping; the geothermal geological survey in the target area of ​​hot dry rock resource exploration is mainly based on high-precision geophysical exploration, large-scale geothermal geology and hot dry rock drilling; the geothermal geological survey in the target area of ​​hot dry rock development is mainly based on comprehensive engineering geological survey and evaluation.

[0120] For example, regional hot dry rock geothermal geological surveys should generally be conducted on the basis of regional geological surveys, geophysical surveys such as gravity and electromagnetic methods, and geothermal heat flow (temperature) measurements. Its main tasks are to discover clues to high-temperature thermal anomalies in geothermal geology, search for high-temperature geothermal resources, and make judgments on whether the work area is worth conducting further investigations. Evaluate the prospects and reservoir potential of hot dry rock resources in prospective areas, and propose areas with greater potential for hot dry rock that can be surveyed. Provide a geological basis for conducting hot dry rock geothermal geological surveys in key areas to reduce exploration and development risks and improve economic benefits. The specific survey contents are as follows: a) Have a preliminary understanding of the natural and cultural conditions, geographical conditions, landforms and hydrogeology, basic characteristics of Quaternary geology, stratigraphic framework, and distribution of major faults in the work area; have a rough grasp of the distribution of stress fields in the work area; and clarify the Mesozoic-Cenozoic plate activity pattern, background, and evolution process in the large region.

[0121] b) Get preliminary clues on whether there are any geothermal geological clues with high-temperature thermal anomalies.

[0122] c) Gain a preliminary understanding of the stratigraphic structure, especially the thickness and changes of the sedimentary cover.

[0123] d) Gain a general understanding of the type, age, burial depth, thickness, and distribution range of hot dry rock masses.

[0124] e) Initially understand the thermal physical parameters such as thermal conductivity and heat generation rate of different formations.

[0125] f) Roughly predict the temperature range of hot dry rocks and propose an approximate range with working value.

[0126] g) Estimate the regional geological resource potential and submit a geothermal geological survey report for the work area.

[0127] The hot dry rock geothermal geological survey in key areas should be conducted on the basis of regional surveys or in areas known to have exploration value. The main tasks are: to check, verify, and trace thermal anomaly clues, and to evaluate the prospecting areas, and to propose areas with development prospects for further detailed investigation, so as to provide geological basis for carrying out detailed investigation of hot dry rock geothermal geology in the exploration target area. The specific exploration contents are as follows: a) Preliminarily determine the scope and scale of the hot dry rocks and their surrounding strata, structures, magma (volcanic) activities, and the range of geothermal anomalies, and clarify the tectonic background of the hot dry rocks within the hot dry rock prospective area and their possible genetic mechanisms.

[0128] b) Make full use of and collect existing exploration and evaluation data to determine the characteristics of regional thermal anomalies; under the condition of sufficient data, map out the geothermal fields at different depths and determine the potential preliminary target areas for hot dry rocks.

[0129] c) Collect existing geophysical exploration data in the study area, mainly including gravity, magnetic method, 2D / 3D seismic, electromagnetic method, etc.; analyze the development areas and backgrounds of regional geothermal anomalies, faults and other structures, interpret the spatial distribution characteristics of hot dry rock bodies, and delineate the distribution areas of concealed hot dry rock bodies.

[0130] d) Use a variety of geochemical exploration methods to analyze geothermal fluid and rock samples to determine the scope of near-surface thermal anomalies, as well as their source depth and temperature.

[0131] e) Collect existing geothermal well data and collect and organize drilling and logging data in the study area. Existing drilling and logging data (including temperature measurement data) in the study area are very important for understanding underground heat transfer characteristics, rock physical and mechanical properties. For wells that meet the temperature measurement conditions, steady-state temperature measurement should be carried out.

[0132] f) Restore the regional tectonic-thermal evolution history, establish the geothermal field curve during the geological history period and its spatial correlation with tectonic evolution, and study the dry hot rock accumulation model.

[0133] g) Integrate geological, geochemical and geophysical data to establish a conceptual model of the genesis of the geothermal system, determine the nature of abnormal heat sources and optimize target areas through surveys, and evaluate the potential of hot dry rock resources at different depths.

[0134] h) Submit a detailed geological survey report for key areas and estimate the amount of hot dry rock resources in key areas.

[0135] The geothermal geological detailed survey of the target area for hot dry rock resource exploration should be carried out on the basis of the investigation of key areas and in accordance with the needs of hot dry rock development, in areas with good resource conditions and favorable development. The main task of the detailed survey is to conduct geological, geophysical and drilling work to identify in detail the characteristics of the hot dry rock host rock mass, temperature field, and geostress field, and to evaluate the geology and environment that affect development, so as to serve the site selection for development. The main contents of the detailed survey are as follows: a) Identify the geostress field and existing cracks and faults in the target area, and predict and evaluate the properties of the cracks (type, density, direction).

[0136] b) Conduct geophysical logging on existing wells in the surrounding area, identify the geothermal gradient of the overburden and hot dry rock reservoir based on the logging data, and obtain the vertical variation characteristics of the chemical composition, structure, thermophysical properties (density, thermal conductivity, heat generation rate) and mechanical parameters (porosity, tensile strength, shear strength, etc.) of the hot dry rock reservoir rock mass.

[0137] c) Conduct rock physics experiments on core or adjacent outcrop samples to obtain rock mechanical properties.

[0138] d) Combined with the site drilling and rock thermophysical data, numerical methods are used to calculate the dry hot rock resource reserves and exploitable volume in the exploration area in detail, and a resource exploration report for the proposed artificial thermal storage area is submitted. The detailed investigation should be carried out on the basis of the general investigation, in accordance with the needs of the dry hot rock development layout plan, in areas with good resource conditions and favorable development, and a detailed geothermal geological investigation report and engineering survey report of the target area should be submitted.

[0139] The main task of the detailed exploration of hot dry rock development target area is to further select favorable target areas for hot dry rock development based on the detailed geothermal geological investigation of the hot dry rock resource exploration target area, and provide detailed geothermal geological data for the development and design of hot dry rock. The results should ensure the scale of artificial heat storage in the development site, find out the distribution of natural fractures and the direction of ground stress in the proposed artificial heat storage area, serve the construction of artificial heat storage, and evaluate the geology and environment that affect the development. The contents of the detailed exploration are as follows: a) Comprehensively analyze and examine the results of hot dry rock resource exploration and evaluation, carry out the construction of hot dry rock exploration and production wells, obtain detailed stratigraphic, structural, geostress, fracture structure development, thermal conductivity, porosity and other physical property related parameters of the hot dry rock exploration and production site, establish a three-dimensional geothermal geological model, and design a heat storage construction plan.

[0140] b) Carry out experimental development of hot dry rock and evaluate the development potential of hot dry rock reservoirs.

[0141] c) In conjunction with the hot dry rock reservoir stimulation test, a microseismic-electromagnetic monitoring system was deployed to conduct microseismic-electromagnetic monitoring and interpretation during the reservoir stimulation process to evaluate the thermal reservoir construction effect.

[0142] d) Based on the acquired data and appropriate assumed boundary conditions, simulate and analyze the stimulated reservoir, evaluate the recoverable resources, optimize the injection and production plan, predict and evaluate the mining life of hot dry rock, and meet the design needs of hot dry rock resource mining.

[0143] In summary, the embodiment of the present invention provides a method for prospecting hot dry rock resources, which can survey the characteristics of earthquake geological disasters, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area, and form a hot dry rock resource exploration report. The embodiment of the present invention provides a systematic and efficient method for prospecting hot dry rock resources, which can comprehensively evaluate the hot dry rock resources in the exploration target area, is conducive to revealing the distribution law of the hot dry rock resources in the exploration target area, the potential of the hot dry rock resources, the development conditions, etc., and provides a basis for the development of hot dry rocks.

[0144] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0145] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0146] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed by the present invention. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0147] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0149] The above is a detailed introduction to a method for exploring hot dry rock resources provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for prospecting hot dry rock resources, characterized in that: The method comprises: Conduct hot dry rock development surveys in the exploration target area to determine the seismic geological disaster characteristics and hot dry rock development conditions in the exploration target area; Conducting a remote sensing geological survey of the exploration target area to determine the hot dry rock geological characteristics of the exploration target area; Based on the arranged observation points and observation routes, a geothermal geological survey is conducted on the exploration target area to determine the hot dry rock geothermal geological characteristics of the exploration target area; Performing geophysical logging on the measurement points within the exploration target area, and determining the geophysical field characteristics of the exploration target area based on the logging data; Conducting geochemical surveys on rock samples in the exploration target area to determine the chemical properties, thermophysical parameters and mechanical parameters of the rocks in the exploration target area; A hot dry rock resource exploration report for the exploration target area is formed based on the seismic geological disaster characteristics, hot dry rock development conditions, hot dry rock geological characteristics, hot dry rock geothermal geological characteristics, geophysical field characteristics, rock chemical properties, thermophysical parameters and mechanical parameters of the exploration target area.

2. The method according to claim 1, characterized in that The earthquake geological disaster characteristics include at least one of the following: historical earthquake characteristics, fault activity characteristics, geological disaster types and levels, building earthquake resistance capabilities, and the current status of lifeline projects.

3. The method according to claim 1, characterized in that The hot dry rock development conditions include at least one of the hot dry rock engineering development conditions, hot dry rock resource utilization conditions and infrastructure conditions; The hot dry rock engineering development conditions include at least one of the following: The topography and geomorphology of the exploration target area; The geological structure of the exploration target area; The type of rock and soil in the exploration target area; Development of engineering geological properties; Development project hydrogeological conditions; Development of engineering geological issues; Environmental impact of development projects; The hot dry rock resource utilization conditions include at least one of the following: Demand for hot dry rock resources; Hot dry rock resource demand pattern; The infrastructure conditions include at least one of the following: Current land use situation; Site construction conditions; Water security level; Power generation grid connection conditions.

4. The method according to claim 1, characterized in that: The remote sensing geological survey of the exploration target area to determine the hot dry rock geological characteristics of the exploration target area includes: Based on the satellite image of the exploration target area, identifying the hot dry rock geological characteristics of the exploration target area; The hot dry rock geological characteristics include at least one of the following: Basic outlines of geological structures; Active faults; Hidden structure; Topographic and geomorphic features; Spatial distribution of rock mass; Areas of abnormal surface temperature; Correlation between regional deep faults and surface thermal anomalies; Surface coverage information related to the hot dry rock development environment in the exploration target area.

5. The method according to claim 1, characterized in that The observation route satisfies at least one of the following: Vertical topography, geological body boundaries and fault strike directions; Conduct lateral tracing along key boundaries and significant changes in topography; Along the extension direction of hot springs, spring blooms and alteration zones; Along the direction of natural cracks in the rock mass.

6. The method according to claim 1, characterized in that The observation point is located in a survey area, and the survey area includes at least one of the following: Stratigraphic boundaries, faults, folds, joints and fissures, igneous rocks, typical outcrops and lithology and lithofacies change zones; The boundary of new tectonic activity and the place where natural geological phenomena develop; The deep stratum structure and / or temperature field of the exploration target area.

7. The method according to claim 1, characterized in that The exploration range of the geophysical logging is larger than the geothermal development and utilization construction range of the exploration target area, and the density of the measurement network composed of the measurement points corresponds to the working scale, and the measurement line composed of the measurement points is perpendicular to the structural trend of the exploration target area.

8. The method according to claim 1, characterized in that: The scale of the maps of the geochemical survey is consistent with that of the geological survey.

9. The method according to claim 1, characterized in that: The rock chemical properties include at least one of the following: The chemical composition and content of the rock samples; The hydrochemical evolution process and groundwater runoff direction of the exploration target area; Stable isotopes and radioactive isotopes in the water of the exploration target area; Hydrothermal alteration minerals in the exploration target area; Stable isotopes and radioactive isotopes in the rock sample.

10. The method according to claim 1, characterized in that The thermophysical property parameters include at least one of the following: Density of hot dry rock reservoirs; Thermal conductivity of hot dry rock reservoirs; Heat generation rate in hot dry rock reservoirs.

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