Method and device for evaluating a discontinuous geothermal reservoir

Abstract

The application provides a method and device for evaluating fault-controlled geothermal reservoir resources, and the method comprises the following steps: obtaining the element content of soil on the surface of an exploration area and the element content in water samples; determining the heat source element content, the channel element content, the caprock element content and the reservoir element content according to the element content of soil and the element content in water samples; and evaluating the fault-controlled geothermal reservoir resources of the exploration area according to the heat source element content, the channel element content, the caprock element content and the reservoir element content. The application identifies and selects soil elements closely related to four elements, i.e. heat reservoir, caprock, channel and heat source, in fault-controlled geothermal exploration, and uses soil element indexes and parameters to identify and evaluate the properties of fault-controlled geothermal high-temperature, medium-temperature and low-temperature resources, so as to determine the favorable area of geothermal heat source and heat reservoir.

Description

Technical Field

[0001] This application belongs to the field of geochemical exploration technology of surface soil elements of geothermal resources, and in particular to the field of data mining technology related to the above-mentioned technical field, specifically involving an evaluation method and device for fault-controlled geothermal reservoir resources. Background Technology

[0002] Currently, with the gradual promotion of new energy technologies, the industry is increasing its utilization of various new energy sources. Geothermal energy is a clean and renewable energy technology that is more environmentally friendly and sustainable compared to traditional fossil fuels. Therefore, geothermal energy exploration and evaluation are of great significance.

[0003] Geothermal reservoir temperature is one of the important aspects of geothermal resource research and evaluation. Deep geothermal reservoir temperature is an indispensable parameter for evaluating geothermal resources. In existing technologies, there are two methods for determining geothermal reservoir temperature: direct measurement method and indirect method (geothermal temperature scale method).

[0004] The direct method measures the temperature of the borehole, offering high accuracy but is time-consuming, expensive, and limited in depth. In most cases, geothermal scales are used to estimate the temperature of deep geothermal reservoirs. Commonly used geothermal scale methods for estimating geothermal reservoir temperature include: the SiO2 scale method (quartz scale, chalcedony scale (Table 1)) and the cation geothermal scale method (Table 2 (Fournier and Truesdell)), and the K-Na-Mg trigonometric method (…). Figure 1 (Z. Mohammadi et al.)), isotopic geothermal scales, and chemical scales such as vapor-liquid two-phase gas CO2 / H2, H2 / Ar, and H2S / H2 (Arnorsson S, Stefansson A, Bjarnason J O. 2005). The estimation of these commonly used temperature scales is limited by the water medium collection method of groundwater (hot spring water), and the conditions for their use are also clearly required (Table 3 (Shan Xuanlong, 2019)).

[0005] Table 1. SiO2 Geothermal Temperature Scale

[0006]

[0007] Note: T is the thermal storage temperature, °C; The content of SiO2 is expressed in mg / L.

[0008] Table 2. Cation Geothermal Temperature Scale

[0009]

[0010] Note: β is the correction coefficient. If t < 100℃ or lg(Ca 0.5 If / Na)>0, β is 4 / 3; if T>100℃ or lg(Ca) 0.5 / Na)<0, β takes 1 / 3.

[0011] Table 3 Commonly Used Geochemical Temperature Scales and Applicable Conditions (Shan Xuanlong, 2019)

[0012]

[0013] On the other hand, geothermal reservoir exploration is also an important part of geothermal resource research. Among the existing geothermal surface geochemical exploration technologies, gas, soil element, and microbial geochemical exploration technologies are generally used. Soil element geochemical exploration technologies include As, Sb, Bi, B, Li, Rb, Cs, Be, Sn, Pb, Zn, Mn, etc. When these soil elements are applied to fault-controlled geothermal exploration, there are no systematic deterministic indicators and methods, or indicative parameters to quantitatively analyze the temperature of geothermal reservoirs. Instead, various soil element anomaly ranges are simply listed. At most, the multi-element zoning in hydrothermal metal deposit exploration is used to qualitatively describe the geothermal range, and different element anomaly overlay maps are used to indicate favorable areas for geothermal exploration.

[0014] The Earth's depths contain immense heat, driving the migration of materials from the upper mantle and lower crust to the upper crust, causing events such as magmatic activity and volcanic eruptions, accompanied by energy transfer and material exchange. There are two ways in which deep Earth heat energy propagates to the surface: one is through heat conduction via crustal rock layers (sedimentary basin geothermal activity), and the other is through water transport via deep, large faults and secondary faults (fault-controlled geothermal activity).

[0015] Geothermal geochemistry methods locate and study geothermal fields by systematically detecting substances (mineral elements, etc.) related to geothermal fields in natural media (soil, soil gases, groundwater, etc.). The migration of geothermal-related elements and associated elements to the Earth's surface in their active state (ions, colloids, ultrafine sub-nano and nanoparticles) to form elemental anomalies is the basis for the application of geothermal geochemistry methods. It is understandable that different types of geothermal systems use different geothermal geochemistry methods and indicators. Summary of the Invention

[0016] One objective of this invention is to solve the problem of easily sampled medium, and to more accurately estimate geothermal reservoir temperature and delineate favorable geothermal exploration areas.

[0017] Another object of the present invention is to provide an evaluation device for intermittent geothermal reservoir resources. A further object of the present invention is to provide an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor, when executing the computer program, implements the steps of the aforementioned intermittent geothermal reservoir resource evaluation method. A further object of the present invention is to provide a readable medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of the aforementioned intermittent geothermal reservoir resource evaluation method.

[0018] To address the technical problems in the background section of this application, the present invention provides the following technical solutions:

[0019] In a first aspect, the present invention provides a method for evaluating fault-controlled geothermal reservoir resources, comprising:

[0020] Obtain the elemental content of the soil on the surface of the exploration area and the elemental content of the water samples;

[0021] The elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the heat storage are determined by the elemental content of the soil and the water sample.

[0022] The fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0023] In some embodiments of the present invention, obtaining the elemental content of the soil on the surface of the exploration area and the elemental content of the water sample includes:

[0024] The elemental content of the soil was obtained based on the X-ray fluorescence spectrum of the soil.

[0025] The water sample was subjected to plasma mass spectrometry analysis to obtain the elemental content in the water sample.

[0026] In some embodiments of the present invention, the heat source element is used to identify the heat source of the intermittent geothermal storage resource; the heat source element includes U, Th, Pb and La.

[0027] In some embodiments of the present invention, the channel elements are used to identify the heat source channels of the disconnected geothermal storage resource, and the channel elements include: Li, Be, Sr and Ba.

[0028] In some embodiments of the present invention, the capping element is used to identify the thermal storage capping property of the fault-controlled geothermal reservoir resource, and the capping element includes: Sr and Ba.

[0029] In some embodiments of the present invention, the thermal storage element is used to identify the thermal storage temperature of the intermittent geothermal thermal storage resource, and the thermal storage element includes: W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As and Sb.

[0030] In some embodiments of the present invention, the fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element, including:

[0031] The heat storage temperature of the fault-controlled geothermal reservoir resource is calculated based on the content of the heat source element, the content of the caprock element, and the content of the heat storage element.

[0032] The heat transfer parameters of the interrupted geothermal reservoir resource are calculated based on the element content of the channel.

[0033] The controlled geothermal reservoir resources are evaluated based on the reservoir temperature and the heat conduction parameters.

[0034] In some embodiments of the present invention, an evaluation method for fault-controlled geothermal reservoir resources further includes:

[0035] When the controlled geothermal reservoir resource is a hot spring, the deep reservoir temperature of the hot spring is determined based on the reservoir temperature, the heat conduction parameters, and the temperature of the hot spring.

[0036] Secondly, the present invention provides an evaluation device for intermittent geothermal reservoir resources, the device comprising:

[0037] The element content acquisition module is used to acquire the element content of the soil on the surface of the exploration area and the element content of water samples.

[0038] The four-element content determination module is used to determine the content of heat source elements, channel elements, caprock elements, and heat storage elements in the soil and water samples.

[0039] The resource evaluation module is used to evaluate the fault-controlled geothermal reservoir resources of the exploration area based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0040] In some embodiments of the present invention, the element content acquisition module includes:

[0041] A soil element acquisition unit is used to acquire the element content of the soil based on the X-ray fluorescence spectrum of the soil.

[0042] The water sample element acquisition unit is used to perform plasma mass spectrometry analysis on the water sample to obtain the element content in the water sample.

[0043] In some embodiments of the present invention, the heat source element is used to identify the heat source of the intermittent geothermal storage resource; the heat source element includes U, Th, Pb and La.

[0044] In some embodiments of the present invention, the channel elements are used to identify the heat source channels of the disconnected geothermal storage resource, and the channel elements include: Li, Be, Sr and Ba.

[0045] In some embodiments of the present invention, the capping element is used to identify the thermal storage capping property of the fault-controlled geothermal reservoir resource, and the capping element includes: Sr and Ba.

[0046] In some embodiments of the present invention, the thermal storage element is used to identify the thermal storage temperature of the intermittent geothermal thermal storage resource, and the thermal storage element includes: W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As and Sb.

[0047] In some embodiments of the present invention, the resource evaluation module includes:

[0048] A geothermal reservoir temperature calculation unit is used to calculate the geothermal reservoir temperature of the interrupted geothermal reservoir resource based on the content of the heat source element, the content of the caprock element, and the content of the geothermal reservoir element.

[0049] The heat transfer parameter calculation unit is used to calculate the heat transfer parameters of the disconnected geothermal reservoir resource based on the element content of the channel.

[0050] The resource evaluation unit is used to evaluate the intermittent geothermal reservoir resources based on the reservoir temperature and the heat conduction parameters.

[0051] In some embodiments of the present invention, an evaluation device for a fault-controlled geothermal energy storage resource further includes:

[0052] The hot spring depth temperature determination module is used to determine the deep reservoir temperature of the hot spring based on the reservoir temperature, the heat conduction parameters, and the temperature of the hot spring when the controlled geothermal reservoir resource is a hot spring.

[0053] Thirdly, the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of an evaluation method for a disconnected geothermal energy storage resource.

[0054] Fourthly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of an evaluation method for disconnected geothermal reservoir resources.

[0055] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of an evaluation method for disconnected geothermal reservoir resources.

[0056] As described above, embodiments of the present invention provide a method and apparatus for evaluating fault-controlled geothermal reservoir resources. The evaluation method for fault-controlled geothermal reservoir resources includes: first, obtaining the elemental content of the soil on the surface of the exploration area and the elemental content of the water sample; then, determining the elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the reservoir based on the elemental content of the soil and the elemental content of the water sample; finally, evaluating the fault-controlled geothermal reservoir resources of the exploration area based on the elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the reservoir.

[0057] The corresponding evaluation device for fault-controlled geothermal reservoir resources includes: an element content acquisition module, used to acquire the element content of the soil on the surface of the exploration area and the element content of the water sample; a four-element element content determination module, used to determine the element content of the heat source, the channel, the caprock, and the reservoir based on the element content of the soil and the water sample; and a resource evaluation module, used to evaluate the fault-controlled geothermal reservoir resources of the exploration area based on the element content of the heat source, the channel, the caprock, and the reservoir.

[0058] In summary, this invention identifies and selects soil elements that are closely related to the four elements of geothermal reservoir, caprock, channel, and heat source in fault-controlled geothermal exploration. It then uses soil element indicators and parameters to identify and evaluate the attributes of high-temperature, medium-temperature, and low-temperature geothermal resources in fault-controlled geothermal exploration, thereby determining favorable areas for geothermal heat sources and reservoirs. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 Geothermal water in existing technology (Na / 1000-K / 100-Mg) 0.5 Triangle diagram;

[0061] Figure 2 This is a schematic flowchart of an evaluation method for a disconnected geothermal reservoir resource according to an embodiment of the present invention;

[0062] Figure 3This is a flowchart illustrating step 100 of an evaluation method for a disconnected geothermal reservoir resource according to an embodiment of the present invention.

[0063] Figure 4 This is a flowchart illustrating step 300 of an evaluation method for a disconnected geothermal reservoir resource in an embodiment of the present invention.

[0064] Figure 5 This is a schematic diagram of another process for evaluating a disconnected geothermal reservoir resource according to an embodiment of the present invention;

[0065] Figure 6 This is a flowchart illustrating a method for evaluating a controlled geothermal reservoir resource according to a specific embodiment of the present invention.

[0066] Figure 7 The following are the results of fault-controlled geothermal geochemical soil element exploration in the Huangshadong area, as described in a specific embodiment of the present invention. Figure 1 ;

[0067] Figure 8 The following are the results of fault-controlled geothermal geochemical soil element exploration in the Huangshadong area, as described in a specific embodiment of the present invention. Figure 2 ;

[0068] Figure 9 The following are the results of fault-controlled geothermal geochemical soil element exploration in the Huangshadong area, as described in a specific embodiment of the present invention. Figure 3 ;

[0069] Figure 10 The following are the results of fault-controlled geothermal geochemical soil element exploration in the Huangshadong area, as described in a specific embodiment of the present invention. Figure 4 ;

[0070] Figure 11 This is a block diagram of an evaluation device for a disconnection-controlled geothermal energy storage resource according to an embodiment of the present invention;

[0071] Figure 12 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0074] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses. Without conflict, the embodiments and features in the embodiments of this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0075] The acquisition, storage, use, and processing of data in this application comply with relevant laws and regulations.

[0076] Patent application CN110760573 A discloses a method for geothermal microbial exploration, comprising: analyzing soil community microbial information of soil samples from known geothermal areas and background areas to determine geothermal-sensitive microbial species and their thresholds; collecting soil samples from the area to be explored and detecting and analyzing the presence of geothermal-sensitive microbial species and / or the relative abundance of geothermal-sensitive microbial species; if geothermal-sensitive microbial species are present in the soil samples of the area to be explored, and / or the relative abundance of geothermal-sensitive microbial species is above the threshold, then the area to be explored is determined to be a geothermal field; if geothermal-sensitive microbial species are not present in the soil samples of the area to be explored, and / or the relative abundance of geothermal-sensitive microbial species is less than the threshold, then the area to be explored is determined to be a non-geothermal field.

[0077] Geothermal geochemistry methods locate and study geothermal fields by systematically detecting substances (mineral elements, etc.) related to the field in natural media (soil, soil gases, groundwater, etc.). The migration of geothermal-related and associated elements to the surface in their mobile states (ions, colloids, ultrafine sub-nano and nanoparticles) to form elemental anomalies is the foundation of geothermal geochemistry methods. Different types of geothermal systems require different geothermal geochemical methods and indicators. Therefore, current technology lacks an evaluation method for determining the favorable spatial location of fault-controlled geothermal sources and reservoirs, as well as accurately estimating the temperature of fault-controlled geothermal reservoir resources.

[0078] Example 1:

[0079] For the reasons stated above, embodiments of the present invention provide a specific implementation method for evaluating intermittent geothermal reservoir resources, see [link to relevant documentation]. Figure 2 Specifically, it includes the following:

[0080] Step 100: Obtain the elemental content of the soil on the surface of the exploration area and the elemental content of the water sample;

[0081] Step 200: Determine the element content of the heat source, the element content of the channel, the element content of the caprock, and the element content of the heat storage based on the element content of the soil and the element content of the water sample;

[0082] Step 300: Evaluate the fault-controlled geothermal reservoir resources of the exploration area based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0083] As described above, this invention provides an evaluation method for fault-controlled geothermal reservoir resources. Utilizing readily collectable soil media from geothermal exploration areas, it selects and identifies soil elements closely related to the four key elements of fault-controlled geothermal exploration: reservoir, caprock, conduit, and heat source. It selects geothermal soil element indicators and parameters to identify and evaluate the attributes of high-temperature, medium-temperature, and low-temperature fault-controlled geothermal resources. Using soil element indicators and parameters, it tracks and determines favorable areas for geothermal heat sources and reservoirs. Based on the surface temperature of exposed hot spring water, it estimates the temperature of fault-controlled geothermal reservoirs and delineates favorable geothermal exploration areas, in conjunction with soil element indicators and parameters.

[0084] Example 2:

[0085] Before step 100, the sampling grid can be determined based on the exploration area, and field sample collection can be carried out. Soil samples are collected after reaching a certain depth using tools such as twist drills, preferably in the 1.0-2.0m range, with a sampling grid of 2km×2km; water samples, such as reservoir water, surface water, geothermal well water, and hot spring water, are collected directly using containers.

[0086] Next, the elemental content in the water sample and the elemental content in the soil can be determined using the following methods:

[0087] Water sample determination methods: Li, Be, Ti, V, Cr, Co, Ni, Cu, Zn, Mo, Cd, Nb, Rb, Th, Ga, Ce, La, Y, Yb, etc. are determined by inductively coupled plasma mass spectrometry; K, Na, Ca, Mg, Fe, Mn, P, Al, Sr, Ba, etc. are determined by inductively coupled plasma spectrometry.

[0088] Soil sample determination methods: K, Mg, Al, Si, P, K, Na, Ca, Ba, Ti, V, Cr, Mn, Fe, Zn, Pb, Sr, Y, Zr, Nb, etc. were determined by X-ray fluorescence spectrometry; Li, Be, Co, Ni, Cu, Cd, La, Th, U, Au, etc. were determined by inductively coupled plasma mass spectrometry; B, Sn, Ag, etc. were determined by emission spectrometry; As, Sb, Bi, Hg were determined by atomic fluorescence spectrometry; W and Mo were determined by polarography; and F was determined by ion-selective electrode.

[0089] For step 200, the outcropping of surface hot springs (underground hot water) indicates deep geothermal anomalies. Geothermal anomalies are closely related to the magma reservoir (magma heat source) of the deep lithosphere. Fault-controlled geothermal formation is closely related to four elements: reservoir, caprock, conduit, and heat source. (1) Reservoir: rock strata containing abundant hot water or steam with good permeability, pores, fissures, and fracture systems; (2) Caprock: impermeable rock strata that directly cover the reservoir and provide insulation; (3) Conduit: structural fractures, fissures, micro-cracks, etc., through which underground hot water (steam) can rise under hydrostatic pressure; (4) Heat source: including thermally radiating magma bodies and hot water substances generated by water-rock interaction. Therefore, by utilizing soil elements that are closely related to the four elements of fault-controlled geothermal formation—reservoir, caprock, conduit, and heat source—the reservoir temperature can be estimated and favorable exploration areas can be delineated.

[0090] It is understandable that steps 200 and 300, by selecting and identifying soil elements closely related to the four elements of reservoir, caprock, conduit, and heat source in fault-controlled geothermal exploration, can systematically estimate reservoir temperature and delineate favorable areas for reservoir exploration.

[0091] In some embodiments of the present invention, see Figure 3 Step 100 includes:

[0092] Step 101: Obtain the elemental content of the soil based on the X-ray fluorescence spectrum of the soil;

[0093] Specifically, the contents of elements such as K, Mg, Al, Si, P, K, Na, Ca, Ba, Ti, V, Cr, Mn, Fe, Zn, Pb, Sr, Y, Zr, and Nb were determined by X-ray fluorescence spectrometry; the contents of elements such as Li, Be, Co, Ni, Cu, Cd, La, Th, U, and Au were determined by inductively coupled plasma mass spectrometry; the contents of elements such as B, Sn, and Ag were determined by emission spectrometry; the contents of elements such as As, Sb, Bi, and Hg were determined by atomic fluorescence spectrometry; the contents of elements such as W and Mo were determined by polarography; and the contents of elements such as F were determined by ion-selective electrode.

[0094] Step 102: Perform plasma mass spectrometry analysis on the water sample to obtain the elemental content in the water sample.

[0095] The contents of elements such as Li, Be, Ti, V, Cr, Co, Ni, Cu, Zn, Mo, Cd, Nb, Rb, Th, Ga, Ce, La, Y, and Yb were determined by inductively coupled plasma mass spectrometry; the contents of elements such as K, Na, Ca, Mg, Fe, Mn, P, Al, Sr, and Ba were determined by inductively coupled plasma spectrometry.

[0096] In some embodiments of the present invention, the heat source element is used to identify the heat source of the intermittent geothermal storage resource; the heat source element includes U, Th, Pb and La.

[0097] Specifically, the selection and identification of soil elements in geothermal exploration are used to determine the heat source elements. It can be understood that the heat source characteristics (heat generation or heat products) of igneous rocks are related to the elements. The heat generation elements of igneous rocks are radioactive U and Th elements, while Pb and La elements are the decay products of radioactive U and Th elements. Therefore, U, Th, Pb, and La elements can correspond well to the geothermal heat source elements, and U, Th, Pb, and La elements are heat source identification indicators.

[0098] In some embodiments of the present invention, the channel elements are used to identify the heat source channels of the disconnected geothermal storage resource, and the channel elements include: Li, Be, Sr and Ba.

[0099] Geothermal water dissolves and carries mineral elements rich in igneous rocks from deep underground through water-rock interaction, making the groundwater rich in easily soluble alkaline (alkaline earth) elements such as Li, Be, Sr, and Ba. Therefore, these elements migrate upwards to the surface through fractures, fissures, and micro-fractures (channel attributes), where they accumulate. The presence of Li, Be, Sr, and Ba elements in the soil reflects geothermal channel information. Li, Be, Sr, and Ba elements are geothermal channel identification indicators, i.e., channel elements.

[0100] In some embodiments of the present invention, the capping element is used to identify the thermal storage capping property of the fault-controlled geothermal reservoir resource, and the capping element includes: Sr and Ba.

[0101] Sr and Ba are both alkaline earth elements with similar chemical properties, but Sr has a stronger migration ability than Ba. The migration of Sr and Ba is affected differently by the caprock. Here, the Sr / Ba index is used as a characterization parameter of the geothermal reservoir capping performance. A larger Sr / Ba index indicates better capping performance of the geothermal reservoir. Therefore, the Sr / Ba migration index reflects the capping performance of the geothermal reservoir and is an indicator for identifying geothermal reservoir caprocks.

[0102] In some embodiments of the present invention, the thermal storage element is used to identify the thermal storage temperature of the intermittent geothermal thermal storage resource, and the thermal storage element includes: W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As and Sb.

[0103] Preferably, the elements in the hydrothermal reservoir are further divided into high-temperature elements, medium-temperature elements, and geothermal elements. Specifically, the mineral elements in high-temperature hydrothermal fluids are divided into high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb), all of which are products of the alteration between underground hydrothermal fluids and magmatic rocks. The higher the reservoir temperature, the higher the content of high-temperature, medium-temperature, and low-temperature elements in the reservoir. The more high-temperature, medium-temperature, and low-temperature elements accumulate on the surface, the greater the anomaly intensity, and the greater the coefficient of variation. Conversely, at lower reservoir temperatures, the content of these elements varies. The content of low-temperature elements is less affected, while the content of high-temperature elements is greatly affected. Low-temperature elements still accumulate significantly in the soil, resulting in a large anomaly intensity and a large coefficient of variation. High-temperature elements accumulate less in the soil, resulting in a small anomaly intensity and a small coefficient of variation. Therefore, the combined use of the coefficients of variation of high-temperature, medium-temperature, and low-temperature elements can serve as one of the indicators for identifying high-temperature, medium-temperature, and low-temperature hydrothermal reservoirs.

[0104] In some embodiments of the present invention, see Figure 4 Step 300 includes:

[0105] Step 301: Calculate the heat storage temperature of the fault-controlled geothermal reservoir resource based on the heat source element content, the caprock element content, and the heat storage element content;

[0106] Specifically, surface geothermal reservoirs (high-temperature elements) and caprock geothermal reservoirs (Sr / Ba) are used in combination for quantitative evaluation of deep geothermal reservoirs. Formula:

[0107]

[0108]

[0109]

[0110]

[0111]

[0112] Where: D i表储 D represents the score of surface thermal reservoir for element i. i表储 A high value indicates that element i has a high surface storage temperature, and A i The average contrast of high-temperature elements (W, Bi, Mo, Sn) in the anomalous region. The average contrast of high-temperature elements (W, Bi, Mo, Sn)i across the entire region. D is the weighted reservoir score for total elemental surface thermal reservoirs. 盖储 B represents the score of the geothermal reservoir caprock, and B represents the average contrast of the Sr / Ba index in the anomalous area. The average Sr / Ba contrast ratio across the entire region indicates a high Sr / Ba ratio, suggesting good caprock sealing and thermal storage properties. A high value indicates a high thermal reservoir temperature. K1 and K2 are the anomaly coefficients of the exploration area for high-temperature elements and the Sr / Ba index, respectively (the ratio of the number of anomaly points in the exploration area to the total number of sampling points in the exploration area). The sum is The higher the score, the higher the temperature of the thermal storage.

[0113] Thermal reserves of the exploration area Classification and evaluation of medium- and high-temperature geothermal resources (T≥150℃, 90≤T<150℃) are conducted: A value range of 30-45 is evaluated as a medium-temperature geothermal resource; A value greater than 45 is considered a high-temperature geothermal resource.

[0114] In addition, if there are known geothermal wells in the area, temperature calibration of thermal reservoir values ​​can be performed, and different regions can be corrected according to the corresponding weights.

[0115] Step 302: Calculate the heat transfer parameters of the interrupted geothermal reservoir resource based on the element content of the channel;

[0116] It is understandable that there is a close positive correlation between fault-controlled geothermal reservoirs and reservoir channels. The higher the temperature of a fault-controlled geothermal reservoir, the greater the thermal conductivity of the reservoir channel, and the more heat is transferred from the reservoir to the surface. Higher reservoir temperatures also result in higher contents of elements such as Li, Be, Sr, and Ba in the reservoir, leading to greater enrichment and accumulation of these elements in the soil and a greater elemental contrast. The formula for quantitatively rating the thermal conductivity of geothermal channels is as follows:

[0117]

[0118]

[0119] Where: D 导热 For the thermal conductivity score of the i-element geothermal storage channel, C i The average contrast of element i in the abnormal region, including Li, Be, Sr, Ba, etc. The average contrast of elements i, such as Li, Be, Sr, and Ba, across the entire region. K3 is the total elemental weighted score for the thermal conductivity of the geothermal reservoir channel; K3 is the anomaly coefficient of the channel elements (Li, Be, Sr, Ba, etc.) in the exploration area.

[0120] Step 303: Evaluate the intermittent geothermal reservoir resource based on the reservoir temperature and the heat conduction parameters.

[0121] Calculate the surface geothermal reservoir score according to formulas (1), (2), (3), (4), and (5). Cap layer thermal storage score and thermal storage score According to thermal storage value The range of values ​​is used to evaluate geothermal resources. A geothermal value of 30-45 indicates a medium-temperature geothermal resource, while a geothermal value greater than 45 indicates a high-temperature geothermal resource.

[0122] In some embodiments of the present invention, see Figure 5 An evaluation method for fault-controlled geothermal reservoir resources also includes:

[0123] Step 400: When the controlled geothermal reservoir resource is a hot spring, determine the deep reservoir temperature of the hot spring based on the reservoir temperature, the heat conduction parameters, and the temperature of the hot spring.

[0124] Specifically, if a hot spring is found in the exploration area, then the formula... A special case of geothermal reservoir in hot springs where the caprock is close to zero, namely hot spring water. According to the law of conservation of energy, the temperature of deep geothermal reservoirs and hot spring water (T) 温泉温度 The product of these two values ​​equals the temperature of the deep thermal reservoir (T). 深部热储 Heat conduction with thermal storage channels Based on the above relationships, the temperature of the deep thermal reservoir (T) can be further estimated. 深部热储 ). formula:

[0125]

[0126] The temperature of the deep geothermal reservoir is calculated according to formula (8). The temperature of the deep geothermal reservoir is calculated by combining the evaluation score of the deep geothermal reservoir, the temperature of the hot spring water, and the evaluation score of the heat conduction of the geothermal reservoir channel.

[0127] As described above, there are many geothermal geochemical exploration methods, but a key principle for soil element selection in a method and system for estimating fault-controlled geothermal reservoir temperatures and exploring reservoirs based on surface soil elements is as follows: The heat exchange between underground hot water and magmatic rocks is accompanied by the migration and replacement of mineral elements. Underground hot water accumulates at depth to form underground reservoirs, which inherit the mineral-rich characteristics of the exchanged water. The reservoir's hot water continues to migrate (or diffuse) upwards, passing through the reservoir caprock to the surface and accumulating in the soil. Therefore, the soil element selection for geothermal geochemical exploration needs to cover the four key attributes of fault-controlled geothermal reservoirs, heat sources, channels, and caprocks.

[0128] ① Heat source: U, Th, Pb, and La are indicators for identifying heat sources; ② Channel: Li, Be, Sr, Ba, etc. are indicators for identifying channels; ③ Heat reservoir: The combined use of the coefficients of variation of elements such as high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) is an indicator for distinguishing between medium-temperature and low-temperature geothermal resources; ④ Cap layer: The Sr / Ba migration index is an indicator for identifying cap layer; ⑤ Geothermal heat reservoir heat characterization is the superposition of two heat components: one part is the surface heat characterization, and the other part is the high-temperature element heat reservoir (surface reservoir) characterized by the surface release of high-temperature elements (soil high-temperature element content). A portion of the heat is characterized by the shading effect of the caprock (migration index Sr / Ba) (caprock-shaded thermal reservoir, or caprock reservoir for short). )

[0129] The combined migration index of surface reservoir and Sr / Ba calculated using high-temperature elements, along with the reservoir capping score obtained from the geothermal reservoir evaluation, indicates that the Huangshadong area is a medium-temperature geothermal resource, a conclusion consistent with the geological conditions of the Huangshadong area. Furthermore, the calculated deep geothermal reservoir temperature in the Huangshadong area, based on hot spring water temperature, thermal conductivity score of the reservoir channels, and deep geothermal reservoir calculations, shows a high degree of agreement with actual results. Therefore, this invention has broad application prospects in fault-controlled geothermal resource exploration.

[0130] Example 3:

[0131] To further illustrate the solution, in one specific embodiment, the present invention also provides a specific implementation of the evaluation method for fault-controlled geothermal reservoir resources, see [link to relevant documentation]. Figure 6 Specifically, it includes the following:

[0132] S1: Sample collection in the exploration area.

[0133] S2: Sample analysis and testing in the exploration area.

[0134] S3: Establish a sample testing database.

[0135] The elements K, Mg, Al, Si, P, K, Na, Ca, Ba, Ti, V, Cr, Mn, Fe, Zn, Pb, Sr, Y, Zr, and Nb measured in the tested water and soil samples were used to establish a database categorized by element type, such as alkali metals and alkaline earth metals, to prepare for subsequent comparative analysis of elements in water and soil samples.

[0136] S4: Identify geochemical elements in fault-controlled geothermal systems.

[0137] Geothermal activity, where heat is transferred to the Earth's surface via deep and secondary faults using water as a carrier, is characterized by fault-controlled geothermal activity. Surface geothermal anomalies are closely related to deep magma chambers (magmatic heat sources). The heat exchange process between underground hot water and deep magma chambers (magmatic heat sources) is accompanied by water-rock interactions. Deep hot water leaches, dissolves (or complexes) the mineral elements (K, Ca, Al, Sr, Li, Rb, Ga, Ti, Cr, Bi, Fe, Ti, Be, Ba, Ga, V, Cr, Mn, Zn, etc.) abundant in the heat source (igneous rocks), resulting in deep hot water rich in these mineral elements.

[0138] Deep geothermal water (including heat source and reservoir characteristics) dissolves and carries mineral elements to form geothermal reservoirs in appropriate spatial locations at depth. The geothermal water in these reservoirs continues to migrate upwards through fractures, fissures, and micro-fractures (including channel characteristics). Some elements migrate to the surface with the geothermal water, forming springs, while others diffuse through the caprock into the surface soil. These elements are adsorbed by soil particles, retained in soil pores, or captured by various secondary soluble salts, clay, and colloidal substances on the surface, thus accumulating in the soil and forming geothermal element anomaly zones. Therefore, geothermal-related element anomalies encompass geological information related to four attributes: fault-controlled geothermal heat sources, reservoirs, channels, and caprocks.

[0139] The heat exchange between geothermal water and magmatic rocks is accompanied by the migration and replacement of mineral elements. The geothermal water accumulates at depth to form underground geothermal reservoirs, which inherit the mineral-rich characteristics of the exchanged water. The geothermal water in the reservoir continues to migrate (or diffuse) upwards, passing through the reservoir caprock to the surface and accumulating in the soil. Therefore, the soil element selection for geothermal geochemical exploration needs to cover the four key attributes of fault-controlled geothermal reservoirs, heat sources, channels, and caprocks.

[0140] S5: Identify disconnected geothermal heat sources.

[0141] As mentioned earlier, the elements U, Th, Pb, and La respond well to the geothermal heat source elements, and their spatial distribution can be considered as the spatial distribution of the granite body burial.

[0142] S6: Identify the disconnected geothermal storage channel.

[0143] Fault-controlled geothermal sources typically supply heat to the reservoir through deep faults. The reservoir water inherits mineral elements from groundwater and magmatic water-rock interaction, resulting in reservoir water rich in easily soluble alkaline (alkaline earth) elements such as Li, Be, Sr, and Ba. These elements migrate upwards through the caprock via faults, fissures, and micro-fissures (reservoir channel properties) and accumulate in the surface soil. Therefore, soil elements such as Li, Be, Sr, and Ba are indicators for identifying fault-controlled geothermal reservoir channels.

[0144] S7: Identify Geothermal Storage with Disconnection / Control Type

[0145] The presence of high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) in geothermal reservoirs are all products of the interaction between geothermal water and magmatic rocks. The higher the reservoir temperature, the higher the content of high-temperature, medium-temperature, and low-temperature elements. High-temperature elements accumulate more on the surface, exhibiting a larger coefficient of variation, while medium-temperature and low-temperature elements also show larger coefficients of variation. Conversely, at lower reservoir temperatures, there are differences in the content of high-temperature, medium-temperature, and low-temperature elements. Low-temperature elements still accumulate in the surface soil, with a still large coefficient of variation, but high-temperature elements accumulate less in the surface soil, with a smaller coefficient of variation. The accumulation of medium-temperature elements falls between the two.

[0146] According to the temperature classification standard of geothermal resources in the "Geological Exploration Specification for Geothermal Resources (GB / T 11615-2010)", geothermal resources are classified as follows: high-temperature geothermal resources (T≥150℃), medium-temperature geothermal resources (90≤T<150℃), and low-temperature geothermal resources (25≤T<90℃). Therefore, the combined use of the coefficients of variation of high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) can be used to determine the geothermal resource attributes of medium-temperature and low-temperature geothermal reservoirs (Table 4).

[0147] Table 4. Identification of Geothermal Resource Reservoir Attributes Based on High Temperature, Medium Temperature, and Low Temperature Elements.

[0148]

[0149] S8: Identify the geothermal cap layer with intermittent control.

[0150] The hydrothermal reservoir is rich in easily soluble alkaline (alkaline earth) elements such as Li, Be, Sr, and Ba. These elements migrate upwards through the caprock via fractures, fissures, and microfractures (reservoir channel properties) and accumulate in the surface soil. Sr and Ba are both alkaline earth elements with similar chemical properties, but Sr has a stronger migration capacity than Ba. The effect of the caprock on the upward migration of Sr and Ba varies. A high Sr / Ba ratio indicates good caprock sealing performance, and the Sr / Ba migration index is an indicator for identifying the caprock of the hydrothermal reservoir.

[0151] S9: Comprehensive evaluation of fault-controlled geothermal resources.

[0152] High-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) directly reflect the hydrothermal fluids in underground geothermal reservoirs. As mentioned earlier, the coefficients of variation of high-temperature, medium-temperature, and low-temperature elements can be used in combination to determine the high-temperature and low-temperature geothermal resource attributes of geothermal reservoirs.

[0153] If the exploration area has already been identified as a medium-high temperature geothermal resource (reservoir T≥90℃), it still needs to be further divided into high temperature geothermal resources (T≥150℃) and medium temperature geothermal resources (90≤T<150℃) according to the above standards. The heat capacity of the medium-high temperature geothermal resource (reservoir T≥90℃) reservoir can be characterized by the superposition of two parts of heat: one part is the surface heat, characterized by the surface release of high temperature elements (soil high temperature element content) (high temperature element heat reservoir, abbreviated as surface reservoir); the other part is the heat capacity of the reservoir caprock, characterized by the caprock shielding (migration index Sr / Ba) (caprock shielding heat reservoir, abbreviated as caprock reservoir).

[0154] In step S9, the process is mainly carried out from two perspectives: heat transfer from the fault-controlled geothermal reservoir to the caprock (step S91) and heat transfer from the fault-controlled geothermal reservoir channel (step S92). For details, please refer to formulas (1) to (8).

[0155] S10: Identification and evaluation of elements in fault-controlled geothermal soils.

[0156] Specifically, firstly, proceed according to step S5 to locate the spatial distribution of the granite bodies associated with the fault-controlled geothermal heat source; then, proceed according to steps S6 and S9 to evaluate the heat conduction of the fault-controlled geothermal reservoir channel, and calculate the heat conduction of the geothermal reservoir channel using formulas (6) and (7). Proceed to step S7, and determine whether the exploration area is a high-temperature or low-temperature geothermal reservoir based on the coefficients of variation of high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb). Then, proceed to the joint evaluation of fault-controlled geothermal reservoir-caprock in steps S8 and S9, and calculate the surface geothermal reservoir score using formulas (1), (2), (3), (4), and (5). Cap layer thermal storage score and thermal storage score According to thermal storage value The range of values ​​is used to evaluate geothermal resources. A geothermal value of 30-45 is considered a medium-temperature geothermal resource, and a geothermal value greater than 45 is considered a high-temperature geothermal resource. The heat conduction of the geothermal reservoir channel is evaluated according to the evaluation in step S9. The deep geothermal reservoir temperature is calculated by formula (8). The deep geothermal reservoir temperature is calculated by the deep geothermal reservoir evaluation score, the hot spring water temperature, and the geothermal reservoir channel heat conduction evaluation score.

[0157] Specific example: Geothermal surface geochemical exploration in the Huangshadong Geothermal Field exploration area of ​​Huizhou City, Guangdong Province.

[0158] (1) Sample collection in the exploration area

[0159] In 2020, a geothermal field with an area of ​​216 km² was established in Huangshadong Geothermal Field, Huizhou City, Guangdong Province. 2Sampling and analysis testing of the chemical detection network were carried out. The coordinates of the four inflection points in the exploration area are (23°14'39.70" N, 114°33'25.86" E), (23°19'20.20" N, 114°38'18.25" E), (23°7'18.17" N, 114°41'11.63" E), and (23°11'58.42" N, 114°46'3.95" E). The sampling points were spaced 2 km × 2 km apart, with 70 sampling physical points deployed. 70 soil samples and 3 water samples were collected.

[0160] Sampling methods: Soil samples were collected after drilling to a depth of 1.0-2m using a twist drill for soil element determination; water samples were collected directly from hot spring water, etc., using containers.

[0161] (2) Sample testing and analysis in the exploration area

[0162] Indoor testing methods: Water sample testing methods are shown in Table 5, soil element testing methods are shown in Table 6; water sample testing results are shown in Table 7.

[0163] Table 5. Water Sample Testing Methods

[0164]

[0165] Table 6. Methods for determining inorganic elements in soil

[0166]

[0167] (3) Establish a sample testing database.

[0168] The elements K, Mg, Al, Si, P, K, Na, Ca, Ba, Ti, V, Cr, Mn, Fe, Zn, Pb, Sr, Y, Zr, and Nb measured in the tested water and soil samples are used to establish a database together according to element categories.

[0169] Table 7. Hydrochemical analysis data of Huangshadong Exploration Area, Huizhou City (μg / L, ND indicates not detected).

[0170]

[0171] (4) Disconnection-controlled geothermal geochemical element identification method.

[0172] The preferred principles and identification methods for soil elements in geothermal exploration mainly select elements with readily soluble elements enriched in geothermal reservoirs (alkaline, alkaline soils), heat-sensitive elements (high temperature, medium temperature, low temperature, etc.), and heat source elements (elements that generate heat or are products of heat generation) as geothermal geochemical exploration indicators. These are elements such as Li, Be, Sr, and Ba (Table 3), U, Th, Pb, and La, W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As, and Sb, and the Sr / Ba index. The anomaly lower limits (T) for the four geothermal attribute identification elements (Li, Be, Sr, Ba, U, Pb, Th, La, W, Bi, Mo, Sn) are shown in Tables 8 and 9 (unit: mg / g).

[0173] Table 8. Statistical table of element content, geothermal elements and migration index in geothermal water in Huangshadong area.

[0174]

[0175]

[0176] Table 9. Statistical Table of High, Medium and Low Temperature Geothermal Elements in Huangshadong Area

[0177]

[0178] (5) Method for identifying geothermal heat sources with disconnection.

[0179] Fault-controlled geothermal heat sources are closely related to the spatial distribution of deep magmatic rocks. The heat-generating elements of magmatic rocks are radioactive U and Th elements, while Pb and La elements are products of the decay of radioactive U and Th elements. Thus, U, Th, Pb, and La elements correspond well to the elements of geothermal heat sources. Therefore, their spatial distribution can be considered as the spatial distribution of the buried granite body (geothermal source).

[0180] (6) Method for identifying disconnected geothermal channels.

[0181] Disruption-controlled geothermal sources typically supply heat to the reservoir through deep faults. The underground hot water in the reservoir inherits the mineral elements rich in igneous rocks from the water-rock interaction between groundwater and igneous rocks, making the reservoir water rich in alkaline and alkaline earth elements such as Li, Be, Sr, and Ba. These elements migrate upwards to the surface through faults, fissures, and micro-fissures (reservoir channel attributes), where they accumulate and enrich in the soil. Therefore, soil elements such as Li, Be, Sr, and Ba are indicators for identifying disruption-controlled geothermal channels.

[0182] (7) Identification method for disconnected geothermal reservoirs.

[0183] The presence of high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) in geothermal reservoirs are all products of the interaction between geothermal water and magmatic rocks. The higher the reservoir temperature, the higher the content of elements such as W, Bi, Zn, Cu, and As. High-temperature elements accumulate more on the surface, resulting in a larger coefficient of variation. The coefficients of variation for medium-temperature and low-temperature elements also increase significantly. Conversely, at lower reservoir temperatures, there are differences in the content of high-temperature, medium-temperature, and low-temperature elements. Low-temperature elements still accumulate in the surface soil, with a still large coefficient of variation, but high-temperature elements accumulate less in the surface soil, resulting in a smaller coefficient of variation. Medium-temperature elements accumulate at a level between the two.

[0184] According to the geothermal resource temperature classification standard in the "Geological Exploration Specification for Geothermal Resources (GB / T 11615-2010)", geothermal resources are categorized as follows: high-temperature geothermal resources (T≥150℃), medium-temperature geothermal resources (90≤T<150℃), and low-temperature geothermal resources (25≤T<90℃). In the Huangshadong area, the coefficients of variation for high-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cd, Ag), and low-temperature elements (As, Sb) in the hydrothermal fluids are all greater than 40 (Table 5). Based on the criteria in Table 10, the Huangshadong area is classified as a medium-high temperature geothermal resource (thermal reservoir (T≥90℃)). The D calculated from W, Bi, Mo, Sn, etc. 表储 Value, migration index Sr / Ba calculated D 盖储 The sum of the two values ​​determines whether the thermal storage is a medium-temperature thermal storage or a high-temperature thermal storage.

[0185] Table 10. Identification of Geothermal Resource Reservoir Attributes Based on High Temperature, Medium Temperature, and Low Temperature Elements.

[0186]

[0187] (8) Method for identifying geothermal cap layer with discontinuity control.

[0188] Caprock: Sr and Ba in hot spring water are both alkaline earth elements with similar chemical properties. Sr has a stronger migration ability than Ba. Therefore, the Sr / Ba migration index can reflect the caprock's sealing performance. A large Sr / Ba index indicates good caprock sealing performance. The Sr / Ba migration index is an identification indicator for hot spring caprock (Table 11).

[0189] Table 11 Evaluation Score of Cover Layer (Migration Index Sr / Ba) in Huangshadong Exploration Area (%)

[0190]

[0191] Note: K1 is the anomaly coefficient of the Sr / Ba index in the exploration area; K1 = 11 ÷ 70 (number of anomaly points / total number of points in the area)

[0192] (9) Discontinuous control type geothermal comprehensive evaluation method.

[0193] ① Joint evaluation method of fault-controlled thermal reservoir-caprock

[0194]

[0195]

[0196]

[0197]

[0198]

[0199] Among them: Di 表储 D represents the score of surface thermal reservoir for element i. i表储 A large value indicates a high storage temperature for element i, and A i The average contrast of high-temperature elements (W, Bi, Mo, Sn) in the anomalous region. The average contrast of high-temperature elements (W, Bi, Mo, Sn)i across the entire region. D is the weighted reservoir score for total elemental surface thermal reservoirs. 盖储 For the caprock score of the geothermal reservoir, B represents the average contrast value of Sr / Ba in the anomalous region. The Sr / Ba ratio is the average contrast value across the entire region. A higher Sr / Ba ratio indicates better thermal insulation and sealing properties of the thermal reservoir cap layer. A higher value indicates a better caprock effect and a higher reservoir temperature. K1 and K2 are the anomaly coefficients (ratio of the number of anomalies in the region to the total number of anomalies in the region) for high-temperature elements and the Sr / Ba index, respectively. The score is The larger the sum of these values, the higher the temperature of the thermal storage.

[0200] The calculated thermal reservoir in the Huangshadong area The value is 18.54 (see Table 6), D 表储 The value is 20.5 (see Table 12). This is based on the combined evaluation and grading method for caprock and reservoir. Values ​​ranging from 30 to 45 indicate a medium-temperature geothermal field. A score of 45 or higher is considered a high-temperature geothermal field. It was learned that the geothermal reservoir score of Huangshadong area was 39.04, and it was determined that the geothermal reservoir of Huangshadong area is a medium-temperature geothermal field.

[0201] Table 12 Comparison of anomalous and non-anomalous areas with the overall average of indicators in the Huangshadong exploration area (%)

[0202]

[0203] Note: K2 is the high-temperature element anomaly coefficient of the exploration area; K2 = 17 ÷ 70 (number of points in the anomaly area / total number of points in the entire area)

[0204] ② Evaluation method for heat transfer in disconnected geothermal storage channels

[0205] The higher the temperature of a fault-controlled geothermal reservoir, the more heat is transferred to the Earth's surface, and the greater the thermal conductivity of the reservoir channel. Fault-controlled geothermal reservoirs and their channels are closely and positively correlated. Higher reservoir temperatures also lead to higher concentrations of elements such as Li, Be, Sr, and Ba in the geothermal water, and greater elemental contrast at the sample points. Therefore, a quantitative rating of the thermal conductivity of the geothermal channel can be calculated using the following formula:

[0206]

[0207]

[0208] Where: D 导热 For the thermal conductivity score of the i-element geothermal storage channel, C i The average contrast of element i in the abnormal region, including Li, Be, Sr, Ba, etc. The average contrast of elements i, such as Li, Be, Sr, and Ba, across the entire region. K3 is the total elemental weighted score for the thermal conductivity of the geothermal reservoir channel; K3 is the anomaly coefficient of the channel elements (Li, Be, Sr, Ba, etc.) in the exploration area.

[0209] Table 13 Statistical table of trace element content indicators such as Li, Be, Sr, and Ba in Huangshadong area

[0210]

[0211]

[0212] The geothermal reservoir channels for Li, Be, Sr, and Ba in the Huangshadong area are calculated using formulas (14) and (15).

[0213] Hot rating score It is 13.85 (see Tables 13 and 14).

[0214] Table 14 Comparison of Anomalous Areas, Non-Anomalous Areas, and Overall Average Values ​​of Indicators in Huangshadong Exploration Area (%)

[0215]

[0216] Note: K3 is the anomaly coefficient of the exploration area channel elements; K3 = 25 ÷ 70 (number of anomaly points / total number of points in the area)

[0217] (10) Exploration, identification and evaluation method of elements in fault-controlled geothermal soils.

[0218] Hot springs have appeared in the Hwangsadong area, then the formula... A special case of geothermal reservoir that occurs when the geothermal reservoir is close to zero, namely, geothermal water... According to the law of conservation of energy, the temperature of deep geothermal reservoirs and hot spring water (T) 温泉温度 The product of these two values ​​equals the temperature of the deep thermal reservoir (T). 深部热储 Heat conduction with thermal storage channels Based on the above relationships, the deep geothermal reservoir temperature (T) is further calculated (estimated). 深部热储 ). formula:

[0219]

[0220] The temperature of the emerging Huilin Hot Spring is 93℃, based on the surface hot spring temperature T. 温泉温度 Calculate the temperature of deep thermal reservoirs:

[0221] T 深部地热 = (20.5 × 93) / 13.85 = 137.65℃.

[0222] The Huire 1 well in the Huangshadong geothermal field began drilling in October 2017 and was completed in October 2018. The completed well depth was 3009m and the bottom temperature was 128℃. The calculated deep reservoir temperature of 137.65℃ and the bottom temperature of 128℃ are less than 10℃ apart.

[0223] (10) Exploration, identification and evaluation method of elements in fault-controlled geothermal soils.

[0224] Specifically, based on step (6), the fault-controlled geothermal exploration in the Huangshadong area is evaluated, and favorable areas for geothermal channels in the Huangshadong area are identified by the spatial distribution of elements such as Li, Be, Sr, and Ba (see...). Figure 7 ), calculate the thermal conductivity score of the geothermal reservoir channel (Table 11); according to step (7), identify the geothermal resource attributes of Huangshadong area. The coefficients of variation of high-temperature elements such as W, Bi, Mo, and Sn, medium-temperature elements such as Zn, Cd, and Ag, and low-temperature elements such as As and Sb are all greater than 50. The geothermal resource attributes of Huangshadong area are identified as medium-high temperature geothermal reservoir (Table 9) ((geothermal reservoir (T≥90℃)). Find the spatial distribution of favorable geothermal resource areas for high-temperature elements such as W, Bi, Mo, and Sn (see Figure 8 Based on step (8), the Sr / Ba migration index is used to find the spatial distribution of favorable areas of the geothermal cap in the Huangshadong area (see...). Figure 9 The caprock is identified (Table 9); based on step (9), the geothermal reservoir score of Huangshadong area is calculated using the joint evaluation method of caprock (Table 9) and geothermal reservoir (Table 10). The value is 39.5, ranging from 30 to 45. The geothermal resources in Huangshadong area are evaluated as a medium-temperature geothermal field. Based on the heat reservoir (Table 10), thermal conductivity (Table 11), and hot spring temperature of 93℃, the deep heat reservoir temperature is calculated to be 137.65℃ using formula (16), which is consistent with the bottom temperature of 128℃ when the depth of Huire 1 well is 3009m. The spatial distribution of geothermal heat sources of igneous rocks was spatially identified by applying the relevant elements U, Th, Pb, and La related to the heat source characteristics (heat generation or heat products) of igneous rocks (see Figure 10 ).

[0225] Evaluation of Elemental Exploration and Identification Methods for Disruption-Controlled Geothermal Soils The values ​​in the range of 30-45 are evaluated as medium-temperature geothermal fields (Table 9), which is consistent with the geothermal resource temperature classification evaluation in the "Geological Exploration Specification for Geological Resources (GB / T 11615-2010)". The deep reservoir temperature of 137.65℃ is consistent with the bottom hole temperature of 128℃. Therefore, the invention of this method and system for estimating fault-controlled geothermal reservoir temperature and geothermal exploration based on surface soil elements is correct, innovative, novel and practical.

[0226] As described above, the specific embodiments of the present invention provide an evaluation method for fault-controlled geothermal reservoir resources, including the following: Four key elements related to fault-controlled geothermal exploration: reservoir, caprock, reservoir, and caprock: ① U, Th, Pb, and La are heat source identification indicators; ② Li, Be, Sr, and Ba are channel identification indicators; ③ High-temperature elements (W, Bi, Mo, Sn), medium-temperature elements (Zn, Cu, Cd, Ag), and low-temperature elements (As, Sb) are reservoir identification indicators; ④ Sr / Ba is the caprock identification indicator; ⑤ The deep reservoir temperature is calculated based on spring water temperature, reservoir score, and reservoir channel score.

[0227] The temperature of the Huangshadong geothermal reservoir was calculated to be 137.65℃ using the method provided in this invention, which is consistent with the bottom-hole temperature of 128℃ in the Huire 1 well (3009m deep). This proves that the invention is correct, innovative, and practical.

[0228] Example 4:

[0229] Based on the same inventive concept, this application also provides an evaluation device for fault-controlled geothermal reservoir resources, which can be used to implement the method described in the above embodiments, as shown in the following embodiments. Since the principle of the fault-controlled geothermal reservoir resource evaluation device is similar to that of the fault-controlled geothermal reservoir resource evaluation method, the implementation of the fault-controlled geothermal reservoir resource evaluation device can refer to the implementation of the fault-controlled geothermal reservoir resource evaluation method, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0230] The embodiments of the present invention provide a specific implementation of an evaluation device for fault-controlled geothermal reservoir resources capable of realizing an evaluation method for fault-controlled geothermal reservoir resources. See [link to specific implementation details]. Figure 11 An evaluation device for fault-controlled geothermal reservoir resources includes:

[0231] The element content acquisition module 10 is used to acquire the element content of the soil on the surface of the exploration area and the element content of the water sample.

[0232] The four-element content determination module 20 is used to determine the content of heat source elements, channel elements, caprock elements, and heat storage elements in the soil and water samples.

[0233] The resource evaluation module 30 is used to evaluate the fault-controlled geothermal reservoir resources of the exploration area based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0234] In some embodiments of the present invention, the element content acquisition module includes:

[0235] A soil element acquisition unit is used to acquire the element content of the soil based on the X-ray fluorescence spectrum of the soil.

[0236] The water sample element acquisition unit is used to perform plasma mass spectrometry analysis on the water sample to obtain the element content in the water sample.

[0237] In some embodiments of the present invention, the heat source element is used to identify the heat source of the intermittent geothermal storage resource; the heat source element includes U, Th, Pb and La.

[0238] In some embodiments of the present invention, the channel elements are used to identify the heat source channels of the disconnected geothermal storage resource, and the channel elements include: Li, Be, Sr and Ba.

[0239] In some embodiments of the present invention, the capping element is used to identify the thermal storage capping property of the fault-controlled geothermal reservoir resource, and the capping element includes: Sr and Ba.

[0240] In some embodiments of the present invention, the thermal storage element is used to identify the thermal storage temperature of the intermittent geothermal thermal storage resource, and the thermal storage element includes: W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As and Sb.

[0241] In some embodiments of the present invention, the resource evaluation module includes:

[0242] A geothermal reservoir temperature calculation unit is used to calculate the geothermal reservoir temperature of the interrupted geothermal reservoir resource based on the content of the heat source element, the content of the caprock element, and the content of the geothermal reservoir element.

[0243] The heat transfer parameter calculation unit is used to calculate the heat transfer parameters of the disconnected geothermal reservoir resource based on the element content of the channel.

[0244] The resource evaluation unit is used to evaluate the intermittent geothermal reservoir resources based on the reservoir temperature and the heat conduction parameters.

[0245] In some embodiments of the present invention, an evaluation device for a fault-controlled geothermal energy storage resource further includes:

[0246] The hot spring depth temperature determination module is used to determine the deep reservoir temperature of the hot spring based on the reservoir temperature, the heat conduction parameters, and the temperature of the hot spring when the controlled geothermal reservoir resource is a hot spring.

[0247] As described above, embodiments of the present invention provide an evaluation device for fault-controlled geothermal reservoir resources, comprising: an element content acquisition module for acquiring the element content of soil on the surface of the exploration area and the element content of water samples; a four-element element content determination module for determining the element content of the heat source, the channel, the caprock, and the reservoir based on the element content of the soil and water samples; and a resource evaluation module for evaluating the fault-controlled geothermal reservoir resources of the exploration area based on the element content of the heat source, the channel, the caprock, and the reservoir.

[0248] In summary, this invention identifies and selects soil elements that are closely related to the four elements of geothermal reservoir, caprock, channel, and heat source in fault-controlled geothermal exploration. It then uses soil element indicators and parameters to identify and evaluate the attributes of high-temperature, medium-temperature, and low-temperature geothermal resources in fault-controlled geothermal exploration, thereby determining favorable areas for geothermal heat sources and reservoirs.

[0249] Example 5:

[0250] The embodiments of this application also provide a specific implementation of an electronic device capable of implementing all steps in the evaluation method for disconnected geothermal reservoir resources described in the above embodiments, see [link to implementation details]. Figure 12 The electronic devices specifically include the following:

[0251] Processor 1201, memory 1202, communications interface 1203, and bus 1204;

[0252] The processor 1201, memory 1202, and communication interface 1203 communicate with each other via bus 1204; the communication interface 1203 is used to realize information transmission between server-side devices and client-side devices and other related devices.

[0253] The processor 1201 is used to call the computer program in the memory 1202. When the processor executes the computer program, it implements all the steps in the evaluation method of the disconnected geothermal energy storage resource in the above embodiment. For example, when the processor executes the computer program, it implements the following steps:

[0254] Obtain the elemental content of the soil on the surface of the exploration area and the elemental content of the water samples;

[0255] The elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the heat storage are determined by the elemental content of the soil and the water sample.

[0256] The fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0257] Example 6:

[0258] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the evaluation method for out-of-control geothermal reservoir resources in the above embodiments. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements all steps of the evaluation method for out-of-control geothermal reservoir resources in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0259] Obtain the elemental content of the soil on the surface of the exploration area and the elemental content of the water samples;

[0260] The elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the heat storage are determined by the elemental content of the soil and the water sample.

[0261] The fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

[0262] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, hardware + program embodiments are relatively simple in description because they are fundamentally similar to method embodiments; relevant parts can be referred to the descriptions in the method embodiments.

[0263] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0264] While this application provides method operation steps as shown in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive labor. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual device or client product execution, the method can be executed sequentially as shown in the embodiments or drawings, or in parallel (e.g., in a parallel processor or multi-threaded processing environment).

[0265] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing the embodiments of this specification, the functions of each module can be implemented in one or more software and / or hardware components, or a module that performs the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0266] Those skilled in the art will also know that, besides implementing the controller using purely computer-readable program code, the same functions can be achieved by logically programming the method steps, making the controller function as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the devices within it used to implement various functions can also be considered structures within that hardware component. Alternatively, the devices used to implement various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0267] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0268] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0269] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0270] The above description is merely an embodiment of the present specification and is not intended to limit the embodiments of the present specification. For those skilled in the art, various modifications and variations can be made to the embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of the present specification should be included within the scope of the claims of the embodiments of the present specification.

Claims

1. A method for evaluating fault-controlled geothermal reservoir resources, characterized in that, include: Obtain the elemental content of the soil on the surface of the exploration area and the elemental content of the water samples; The elemental content of the heat source, the elemental content of the channel, the elemental content of the caprock, and the elemental content of the heat storage are determined by the elemental content of the soil and the water sample. The fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

2. The evaluation method for fault-controlled geothermal reservoir resources according to claim 1, characterized in that, The acquisition of elemental content in the soil and water samples from the surface of the exploration area includes: The elemental content of the soil was obtained based on the X-ray fluorescence spectrum of the soil. The water sample was subjected to plasma mass spectrometry analysis to obtain the elemental content in the water sample.

3. The evaluation method for fault-controlled geothermal reservoir resources according to claim 1, characterized in that, The heat source elements are used to identify the heat source of the intermittent geothermal reservoir resource; the heat source elements include U, Th, Pb and La.

4. The evaluation method for fault-controlled geothermal reservoir resources according to claim 1, characterized in that, The channel elements are used to identify the heat source channels of the disconnected geothermal reservoir resource, and the channel elements include: Li, Be, Sr and Ba.

5. The evaluation method for fault-controlled geothermal reservoir resources according to claim 1, characterized in that, The caprock element is used to identify the thermal storage capping property of the fault-controlled geothermal reservoir resource, and the caprock element includes: Sr and Ba.

6. The evaluation method for fault-controlled geothermal reservoir resources according to claim 1, characterized in that, The thermal storage elements are used to identify the thermal storage temperature of the intermittent geothermal thermal storage resource. The thermal storage elements include: W, Bi, Mo, Sn, Zn, Cu, Cd, Ag, As, and Sb.

7. The evaluation method for fault-controlled geothermal reservoir resources according to any one of claims 1 to 6, characterized in that, The fault-controlled geothermal reservoir resources of the exploration area are evaluated based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element, including: The heat storage temperature of the fault-controlled geothermal reservoir resource is calculated based on the content of the heat source element, the content of the caprock element, and the content of the heat storage element. The heat transfer parameters of the interrupted geothermal reservoir resource are calculated based on the element content of the channel. The controlled geothermal reservoir resources are evaluated based on the reservoir temperature and the heat conduction parameters.

8. The evaluation method for fault-controlled geothermal reservoir resources according to claim 7, characterized in that, Also includes: When the controlled geothermal reservoir resource is a hot spring, the deep reservoir temperature of the hot spring is determined based on the reservoir temperature, the heat conduction parameters, and the temperature of the hot spring.

9. An evaluation device for intermittent geothermal energy storage resources, characterized in that, include: The element content acquisition module is used to acquire the element content of the soil on the surface of the exploration area and the element content of water samples. The four-element content determination module is used to determine the content of heat source elements, channel elements, caprock elements, and heat storage elements in the soil and water samples. The resource evaluation module is used to evaluate the fault-controlled geothermal reservoir resources of the exploration area based on the content of the heat source element, the content of the channel element, the content of the caprock element, and the content of the reservoir element.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the evaluation method for the disconnected geothermal reservoir resources as described in any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the evaluation method for the uncontrolled geothermal reservoir resources as described in any one of claims 1 to 8.

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