Method and device for establishing three-dimensional temperature field and medium

Abstract

The invention provides a three-dimensional temperature field establishment method and device and a medium, and relates to the technical field of geothermal resource exploration and development, and the method comprises the steps: establishing a three-dimensional structure model of a research area; based on the three-dimensional structure model and the porosity data of the research area, establishing a porosity model of the research area; based on the porosity model and the rock thermal conductivity data in the research area, establishing a stratum thermal conductivity model of the research area; and establishing a three-dimensional temperature field of the research area based on the stratum thermal conductivity model, the heat flow data of the research area and the surface temperature. Therefore, the three-dimensional temperature field is established, the temperature of any layer and any depth in the three-dimensional temperature field can be obtained, the real-time performance and the accuracy of the three-dimensional temperature field are improved, and a basis is provided for geothermal resource evaluation and favorable target region optimization.

Description

Technical Field

[0001] This invention relates to the field of geothermal resource exploration and development technology, and more specifically, to a method, apparatus and medium for establishing a three-dimensional temperature field. Background Technology

[0002] Geothermal energy is a clean, environmentally friendly, non-fossil energy source and a stable and reliable local energy source. It is characterized by abundant reserves, wide distribution, safety, stability (unaffected by seasons, climate, and diurnal variations), high utilization rate, and low operating costs. Geothermal energy resources have enormous potential, and realizing their large-scale development and utilization will help establish a diversified global supply system, optimize the energy structure, and improve the overall efficiency of energy utilization.

[0003] In existing technologies, the method for establishing a geothermal field is to obtain the temperature values ​​of certain spatial points based on temperature measurement data of the study area, and then perform spatial interpolation to obtain a planar temperature distribution map. This method cannot obtain a three-dimensional temperature field, nor can it obtain the temperature at any location within a three-dimensional temperature field.

[0004] To address the problems of existing technologies, this invention provides a method, apparatus, and medium for establishing a three-dimensional temperature field. Summary of the Invention

[0005] To address the problems of existing technologies, this invention provides a method, apparatus, and medium for establishing a three-dimensional temperature field, the method comprising:

[0006] Establish a three-dimensional structural model of the study area;

[0007] Based on the three-dimensional structural model and the porosity data of the study area, a porosity model of the study area is established.

[0008] Based on the porosity model and the thermal conductivity data of rocks in the study area, a formation thermal conductivity model for the study area is established.

[0009] Based on the formation thermal conductivity model, the heat flow data of the study area, and the surface temperature, a three-dimensional temperature field of the study area is established.

[0010] According to an embodiment of the present invention, the three-dimensional structural model is established through the following steps:

[0011] Based on the drilling, geological, and seismic data of the study area, the boundaries and stratigraphic levels of the study area are obtained.

[0012] Based on the boundary and the stratigraphic level, a three-dimensional geological framework for the study area is established;

[0013] Based on the aforementioned three-dimensional geological framework, the three-dimensional structural model is established.

[0014] According to an embodiment of the present invention, the three-dimensional structural model is established through the following steps:

[0015] Based on the aforementioned three-dimensional geological framework, geological bodies and strata of the study area are established, and meshing is performed to create the three-dimensional structural model composed of multiple mesh units.

[0016] According to an embodiment of the present invention, the porosity model is established through the following steps:

[0017] The porosity data is used to assign values ​​to the three-dimensional structural model;

[0018] The assigned 3D construction model is coarsened and processed using a sequential Gaussian algorithm;

[0019] Spatial interpolation is performed on the processed three-dimensional structural model to establish the porosity model.

[0020] According to an embodiment of the present invention, the formation thermal conductivity model is established through the following steps:

[0021] Based on the rock thermal conductivity data and the three-dimensional structural model, the rock thermal conductivity model is established;

[0022] Based on the rock thermal conductivity model and the porosity model, the formation thermal conductivity model is established.

[0023] According to an embodiment of the present invention, the formation thermal conductivity model is established through the following steps:

[0024] Based on the rock thermal conductivity model and the porosity model, the first thermal conductivity and the first porosity of the rock in each layer are obtained respectively.

[0025] The difference between the preset value and the first porosity is calculated and used as the first target value;

[0026] The first porosity is used as the second target value;

[0027] The formation thermal conductivity of the study area is obtained by multiplying the first target value of the first thermal conductivity by the second target value of the thermal conductivity of the geothermal fluid in the study area by the power of the first target value, so as to establish the formation thermal conductivity model.

[0028] According to an embodiment of the present invention, the three-dimensional temperature field is established through the following steps:

[0029] Based on the three-dimensional structural model and the heat flow data, the geothermal heat flow field of the study area is established;

[0030] Based on the aforementioned geothermal flow field and the aforementioned stratum thermal conductivity model, a temperature increment model for the study area is established.

[0031] The three-dimensional temperature field is obtained by summing the surface temperature with the summation result of the temperature increment model.

[0032] According to an embodiment of the present invention, the temperature increment model is established through the following steps:

[0033] Divide the geothermal flow field of each stratum by the corresponding stratum thermal conductivity model to obtain the geothermal gradient model;

[0034] Divide the geothermal gradient model by the preset height value to obtain the temperature increment model.

[0035] According to another aspect of the invention, a storage medium is also provided, comprising a series of instructions for performing the steps of the method as described in any of the preceding claims.

[0036] According to another aspect of the present invention, an apparatus for establishing a three-dimensional temperature field is also provided, which performs the method as described in any of the preceding claims, the apparatus comprising:

[0037] The first module is used to create a three-dimensional structural model of the study area;

[0038] The second establishment module is used to establish a porosity model of the study area based on the three-dimensional construction model and the porosity data of the study area;

[0039] The third module is used to establish a formation thermal conductivity model for the study area based on the porosity model and the thermal conductivity data of rocks in the study area.

[0040] The fourth module is used to establish a three-dimensional temperature field of the study area based on the formation thermal conductivity model, the heat flow data of the study area, and the surface temperature.

[0041] This invention provides a method, apparatus, and medium for establishing a three-dimensional temperature field, which has the following advantages compared with the prior art:

[0042] This invention first establishes a three-dimensional structural model of the study area. Then, based on the three-dimensional structural model and porosity data, a porosity model is established. Next, based on the porosity model and rock thermal conductivity data, a formation thermal conductivity model is established. Finally, based on the formation thermal conductivity model, heat flow data of the study area, and surface temperature, a three-dimensional temperature field of the study area is established. This enables the establishment of a three-dimensional temperature field and allows for the acquisition of temperatures at any layer and depth within the three-dimensional temperature field, improving the real-time performance and accuracy of the three-dimensional temperature field. It also provides a basis for geothermal resource evaluation and the selection of favorable target areas.

[0043] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 A flowchart of a method for establishing a three-dimensional temperature field according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of a three-dimensional construction model according to an embodiment of the present invention is shown;

[0047] Figure 3 A schematic diagram of a porosity model according to an embodiment of the present invention is shown;

[0048] Figure 4 A schematic diagram of a rock thermal conductivity model according to an embodiment of the present invention is shown;

[0049] Figure 5 A schematic diagram of a formation thermal conductivity model according to an embodiment of the present invention is shown;

[0050] Figure 6 A schematic diagram of a geothermal flow field according to an embodiment of the present invention is shown;

[0051] Figure 7 A schematic diagram of a geothermal gradient model according to an embodiment of the present invention is shown;

[0052] Figure 8 A schematic diagram of a temperature increment model according to an embodiment of the present invention is shown;

[0053] Figure 9 A schematic diagram of a three-dimensional temperature field according to an embodiment of the present invention is shown;

[0054] Figure 10 A block diagram of an apparatus for establishing a three-dimensional temperature field according to an embodiment of the present invention is shown;

[0055] Figure 11 A schematic diagram of a three-dimensional temperature field according to yet another embodiment of the present invention is shown;

[0056] Figure 12 A schematic diagram of a three-dimensional temperature field according to another embodiment of the present invention is shown.

[0057] In the accompanying drawings, the same parts use the same reference numerals. Also, the drawings are not drawn to scale. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0059] Existing technology (Characteristics and Controlling Factors of the Current Geothermal Field in the Songliao Basin) mentions that by collecting oil test temperature data from 826 boreholes in the Songliao Basin and combining the thermal conductivity test results of 150 core samples, the current geothermal field characteristics of the entire basin were systematically characterized, and the stratum temperature at a depth of 4000m was calculated based on deep temperature prediction technology. The results show that the current geothermal gradient in the Songliao Basin ranges from 22.5 to 69.0℃ / km, with an average of 44.0℃ / km. The thermal conductivity values ​​of rocks in the central depression area are relatively concentrated, mostly between 1.60 and 2.40 W / (m·K), with an average of 1.84 W / (m·K). Mudstone has the lowest thermal conductivity, with an average of 1.77 W / (m·K); siltstone has a moderate thermal conductivity, with an average of 1.87 W / (m·K); and fine sandstone has the highest thermal conductivity, with an average of 2.12 W / (m·K). The geothermal heat flow value ranges from 35.0 to 98.8 mW / m 2 The average value is 76.9 mW / m 2 It is a typical "thermal basin," exhibiting a ring-shaped distribution pattern with a high center and low edges in plan view. The stratigraphic temperature at a depth of 1000m in the Songliao Basin ranges from 26.9 to 72.3℃, with an average of 47.9℃; at 2000m, it ranges from 49.4 to 141.3℃, with an average of 91.9℃; at 3000m, it ranges from 71.8 to 167.5℃, with an average of 135.8℃; and at 4000m, it ranges from 94.3 to 210.9℃, with an average of 179.8℃. This differs from the steps of this invention.

[0060] Existing technologies indicate that the current geothermal field is a comprehensive reflection of tectonic activity and the thermal state of the lithosphere, and is of great significance for studying the regional tectonic evolution of basins, the structure of the deep lithosphere, and assessing oil and gas potential. Geothermal gradient and geothermal heat flow are two fundamental parameters characterizing the thermal state of sedimentary basins. Although my country has relatively abundant geothermal data, which has been systematically compiled four times, reports on geothermal data in the study area and adjacent basins are scarce and lack systematic organization. This paper, based on newly added drilling temperature data in recent years, calculates 810 geothermal gradient data points in the study area and collects geothermal data from domestic and international databases and journals. On this basis, for the first time, it systematically organizes geothermal gradient and geothermal heat flow data for the study area and adjacent basins, draws contour maps, analyzes the characteristics of the current geothermal field in the study area, and discusses its influencing factors. The results show that the average geothermal gradient in the study area and adjacent basins is 43.2±25.7℃ / km, and the average geothermal heat flow is 74.4±26.6 mW / m². 2 Most basins have an average geothermal heat flow exceeding 65 mW / m 2 This belongs to the category of "hot basins." The steps differ from those of this invention.

[0061] To address the aforementioned shortcomings of existing technologies, this invention provides a method, apparatus, and medium for establishing a three-dimensional temperature field. Figure 1 A flowchart illustrating a method for establishing a three-dimensional temperature field according to an embodiment of the present invention is shown. The method includes:

[0062] S101, Establish a three-dimensional structural model of the study area;

[0063] S102. Based on the three-dimensional structural model and the porosity data of the study area, a porosity model of the study area is established.

[0064] S103. Based on the porosity model and the thermal conductivity data of rocks in the study area, a formation thermal conductivity model for the study area was established.

[0065] S104, based on the formation thermal conductivity model, heat flow data and surface temperature of the study area, establishes a three-dimensional temperature field of the study area.

[0066] This invention first establishes a three-dimensional structural model of the study area. Then, based on the three-dimensional structural model and porosity data, a porosity model is established. Next, based on the porosity model and rock thermal conductivity data, a formation thermal conductivity model is established. Finally, based on the formation thermal conductivity model, heat flow data of the study area, and surface temperature, a three-dimensional temperature field of the study area is established. This enables the establishment of a three-dimensional temperature field and allows for the acquisition of temperatures at any layer and depth within the three-dimensional temperature field, improving the real-time performance and accuracy of the three-dimensional temperature field. It also provides a basis for geothermal resource evaluation and the selection of favorable target areas.

[0067] In one possible embodiment, a three-dimensional construction model is established through the following steps:

[0068] Based on drilling, geological, and seismic data of the study area, the boundaries and stratigraphic levels of the study area are obtained.

[0069] A three-dimensional geological framework for the study area was established based on the boundaries and stratigraphic levels.

[0070] A three-dimensional structural model was established based on a three-dimensional geological framework.

[0071] Among them, drilling data can be drilling coordinates; geological data can be geological stratification, tectonic unit division, top surface structure, and fault distribution; and seismic data can be seismic profiles. In this way, accurate boundaries and stratigraphic levels can be obtained based on data such as drilling coordinates, geological stratification, tectonic unit division, top surface structure, fault distribution, and seismic profiles.

[0072] Next, based on the boundaries and stratigraphic levels, a three-dimensional geological framework is established to create a three-dimensional structural model, such as... Figure 2 As shown.

[0073] In this way, a three-dimensional structural model was established, and the established three-dimensional structural model was matched with the study area, providing a basis for the establishment of the porosity model.

[0074] In one possible embodiment, a three-dimensional construction model is established through the following steps:

[0075] Based on a three-dimensional geological framework, geological bodies and strata of the study area are established, and grid subdivision is performed to create a three-dimensional structural model composed of multiple grid units.

[0076] This allows for the creation of a three-dimensional construction model and improves its accuracy.

[0077] In one possible embodiment, a porosity model is established through the following steps:

[0078] Values ​​are assigned to the three-dimensional structural model based on porosity data;

[0079] The assigned 3D construction model is coarsened and processed using a sequential Gaussian algorithm;

[0080] Spatial interpolation is performed on the processed 3D structural model to establish a porosity model.

[0081] For example, porosity data can be collected from different stratigraphic units, lithologies, and depths within the study area. Porosity data can be obtained through well logging interpretation data and measured rock data. The porosity model can be a three-dimensional model.

[0082] Next, porosity data can be assigned to the mesh cells of the 3D structural model based on stratigraphic position, depth, and other information. Then, the assigned 3D structural model is coarsened and processed using a sequential Gaussian algorithm. Following this, kriging space interpolation can be performed on the processed 3D structural model to establish the porosity model. Figure 3 As shown.

[0083] This enabled the establishment of a porosity model that matches the study area, improving the accuracy of the porosity model and providing reliable data support for the establishment of a formation thermal stratigraphy model.

[0084] In one possible embodiment, a formation thermal conductivity model is established through the following steps:

[0085] A rock thermal conductivity model is established based on rock thermal conductivity data and a three-dimensional structural model.

[0086] A formation thermal conductivity model is established based on the rock thermal conductivity model and porosity model.

[0087] For example, rock thermal conductivity data can be measured data from different strata and depths within the study area. This data can be used to assign values ​​to a three-dimensional structural model, resulting in a rock thermal conductivity model such as... Figure 4 As shown. Then, based on the rock thermal conductivity model and porosity model, a formation thermal conductivity model can be established.

[0088] In this way, based on rock thermal conductivity data and porosity model, a formation thermal conductivity model was established, which improved the accuracy of the formation thermal conductivity model and provided a basis for the establishment of a three-dimensional temperature field.

[0089] In one possible embodiment, a formation thermal conductivity model is established through the following steps:

[0090] The first thermal conductivity and first porosity of the rock in each layer were obtained based on the rock thermal conductivity model and porosity model, respectively.

[0091] The difference between the preset value and the first porosity is calculated and used as the first target value;

[0092] Use the first porosity as the second target value;

[0093] The formation thermal conductivity of the study area is obtained by multiplying the first target value of the first thermal conductivity by the second target value of the thermal conductivity of the geothermal fluid in the study area by the power of the first target value, so as to establish a formation thermal conductivity model.

[0094] For example, the default value can be 1; the geothermal fluid can be water.

[0095] After obtaining the first thermal conductivity and the first porosity, the first target value and the second target value can be calculated. Then, the first thermal conductivity, the first porosity, the first target value, and the second target value are substituted into Equation 1 to obtain the formation thermal conductivity:

[0096]

[0097] Where K refers to the thermal conductivity of the formation; K r The first thermal conductivity; Refers to the first porosity; K w Refers to the thermal conductivity of geothermal fluids.

[0098] Then, values ​​can be assigned to the three-dimensional structural model based on the formation thermal conductivity to obtain the formation thermal conductivity model, such as... Figure 5 As shown.

[0099] Thus, based on the rock thermal conductivity model and porosity model, a formation thermal conductivity model was established, which improved the accuracy of the formation thermal conductivity model and provided a basis for the establishment of a three-dimensional temperature field.

[0100] In one possible embodiment, a three-dimensional temperature field is established through the following steps:

[0101] Based on the three-dimensional structural model and heat flow data, the geothermal heat flow field of the study area was established.

[0102] A temperature increment model for the study area is established based on the geothermal flow field and the thermal conductivity model of the strata.

[0103] The surface temperature is summed with the summation results of the temperature increment model to obtain the three-dimensional temperature field.

[0104] Among these methods, the three-dimensional structural model can be assigned values ​​based on heat flow data to obtain the geothermal heat flow field of the study area, such as... Figure 6 As shown. Next, based on the large thermal flow field and formation thermal conductivity model, a temperature increment model for the study area is established as follows. Figure 8 As shown in the figure, and then, as shown in Equation 2, the three-dimensional temperature field can be obtained as follows: Figure 9 As shown:

[0105] T = T s +∑ΔT Equation 2

[0106] In Equation 2, T refers to the three-dimensional temperature field; T s ΔT refers to surface temperature; ΔT refers to the temperature increment model.

[0107] For example, the three-dimensional temperature field can be the temperature field composed of each layer in the study area, or it can be the temperature field composed of some layers in the study area. Similarly, the three-dimensional temperature field composed of some layers can be obtained based on some layers in the temperature increment model, or the temperature field composed of each layer can be obtained based on each layer in the temperature increment model.

[0108] In this way, based on the formation thermal conductivity model, heat flow data and surface temperature, a three-dimensional temperature field can be established, which can obtain the temperature of any layer and any depth in the three-dimensional temperature field, improve the accuracy and real-time performance of the three-dimensional temperature field, and provide detailed temperature evidence for geothermal resource evaluation and selection of favorable target areas.

[0109] In one possible embodiment, a temperature increment model is established through the following steps:

[0110] Divide the geothermal flow field of each layer by the corresponding geothermal conductivity model to obtain the geothermal gradient model;

[0111] Divide the geothermal gradient model by the preset height value to obtain the temperature increment model.

[0112] For example, the preset height value can be determined according to the actual application scenario; in this invention, it is set to 100m.

[0113] Among them, it can be shown in Equation 3. Figure 6 The geothermal flow field shown is Figure 5 The formation thermal conductivity model shown is divided accordingly to obtain the geothermal gradient model as follows: Figure 7 As shown:

[0114] dT / dZ=q / K Formula 3

[0115] In Equation 3, dT / dZ refers to the geothermal gradient model; q refers to the geothermal flow field; and K refers to the formation thermal conductivity model.

[0116] Then, the geothermal gradient model is divided by the preset height value to obtain the temperature increment model per unit height, as shown below. Figure 8 As shown.

[0117] Thus, based on the geothermal flow field and the thermal conductivity model of the strata, a temperature increment model can be obtained, providing a basis for the establishment of a three-dimensional temperature field.

[0118] The method for establishing a three-dimensional temperature field provided by this invention can also be used in conjunction with a computer-readable storage medium. The storage medium stores a computer program, which is executed to run the method for establishing the three-dimensional temperature field. The computer program can execute computer instructions, which include computer program code. The computer program code can be in the form of source code, object code, executable file, or some intermediate form.

[0119] Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0120] It should be noted that the contents of computer-readable storage media may be appropriately added to or subtracted from the contents according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media may not include electrical carrier signals and telecommunication signals.

[0121] According to another aspect of the present invention, an apparatus for establishing a three-dimensional temperature field is also provided, which performs a method for establishing a three-dimensional temperature field. Figure 10 A block diagram of an apparatus for establishing a three-dimensional temperature field according to an embodiment of the present invention is shown. The apparatus includes:

[0122] The first module 510 is used to establish a three-dimensional structural model of the study area;

[0123] The second module 520 is used to establish a porosity model of the study area based on the three-dimensional structural model and the porosity data of the study area.

[0124] The third module 530 is used to establish a formation thermal conductivity model for the study area based on the porosity model and the thermal conductivity data of rocks in the study area.

[0125] The fourth module 540 is used to establish a three-dimensional temperature field of the study area based on the formation thermal conductivity model, heat flow data of the study area, and surface temperature.

[0126] Example: Taking an oilfield area as an example, S1, based on the abundant drilling data of the oilfield area and combined with the regional geological and geophysical data such as well logging, a three-dimensional structural model of the study area is established, which is initially divided into 8 layers from top to bottom;

[0127] S2. Establish a three-dimensional porosity model of the oilfield area based on multi-well logging data and rock test analysis data;

[0128] S3. By analyzing the rock thermal conductivity data and three-dimensional porosity model obtained through testing, a formation thermal conductivity model for the oilfield area is established.

[0129] S4. Export the calculation data table as shown in Table 1 (Table 1 only shows some parameters) and establish the three-dimensional temperature field of the oilfield area.

[0130] Table 1. Calculation data for the three-dimensional temperature field

[0131]

[0132]

[0133] Using the method established in this invention, a three-dimensional temperature field at a depth of 5 km was constructed in the oilfield area, such as... Figure 11 The three-dimensional temperature field of Zone 1-Zone 3, such as Figure 12 The table shows the three-dimensional temperature field of Zone 4. As shown in Table 1, the temperature at a depth of 5 km in this region can reach 175.4℃. For the four zones (Zone 1, Zone 2, Zone 3, and Zone 4) that require focused evaluation, their respective temperature distributions can be obtained as follows: Zone 1: 50.4-84.6℃; Zone 2: 75.8-118.6℃; Zone 3: 78.5-153.6℃; Zone 4: 125.2-175.4℃.

[0134] The results show that the method is feasible and effective, and can obtain the temperature distribution at any layer and depth in the study area. It also shows that the temperature of Zone 4 can reach 175.4℃, which has great geothermal resource potential and can be considered for high-temperature power generation and cascade utilization.

[0135] In summary, this invention provides a method, apparatus, and medium for establishing a three-dimensional temperature field, which has the following advantages compared with the prior art:

[0136] This invention first establishes a three-dimensional structural model of the study area. Then, based on the three-dimensional structural model and porosity data, a porosity model is established. Next, based on the porosity model and rock thermal conductivity data, a formation thermal conductivity model is established. Finally, based on the formation thermal conductivity model, heat flow data of the study area, and surface temperature, a three-dimensional temperature field of the study area is established. This enables the establishment of a three-dimensional temperature field and allows for the acquisition of temperatures at any layer and depth within the three-dimensional temperature field, improving the real-time performance and accuracy of the three-dimensional temperature field. It also provides a basis for geothermal resource evaluation and the selection of favorable target areas.

[0137] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0138] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0139] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0140] Certain terms are used throughout this application to refer to specific system components. As those skilled in the art will recognize, the same components may often be referred to by different names, and therefore this application is not intended to distinguish those components that differ only in name and not in function. In this application, the terms “comprise,” “include,” and “have” are used in an open-ended manner and should therefore be interpreted as meaning “including, but not limited to…”. Furthermore, the terms “substantially,” “materially,” or “approximately” as used herein refer to industry-accepted tolerances for the corresponding terms. The term “coupling,” as may be used herein, includes direct coupling and indirect coupling via additional components, elements, circuits, or modules, wherein, for indirect coupling, the intermediate component, element, circuit, or module does not alter the information of the signal but may adjust its current level, voltage level, and / or power level. Inferred coupling (e.g., one element is inferredly coupled to another element) includes direct and indirect coupling between two elements in the same manner as “coupling.”

[0141] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0142] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0143] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A method for establishing a three-dimensional temperature field, characterized in that, The method includes: Establish a three-dimensional structural model of the study area; Based on the three-dimensional structural model and the porosity data of the study area, a porosity model of the study area is established. Based on the porosity model and the thermal conductivity data of rocks in the study area, a formation thermal conductivity model for the study area is established. Based on the formation thermal conductivity model, the heat flow data of the study area, and the surface temperature, a three-dimensional temperature field of the study area is established.

2. The method as described in claim 1, characterized in that, The three-dimensional construction model is established through the following steps: Based on the drilling, geological, and seismic data of the study area, the boundaries and stratigraphic levels of the study area are obtained. Based on the boundary and the stratigraphic level, a three-dimensional geological framework for the study area is established; Based on the aforementioned three-dimensional geological framework, the three-dimensional structural model is established.

3. The method as described in claim 2, characterized in that, The three-dimensional construction model is established through the following steps: Based on the aforementioned three-dimensional geological framework, geological bodies and strata of the study area are established, and meshing is performed to create the three-dimensional structural model composed of multiple mesh units.

4. The method as described in claim 3, characterized in that, The porosity model is established through the following steps: The porosity data is used to assign values ​​to the three-dimensional structural model; The assigned 3D construction model is coarsened and processed using a sequential Gaussian algorithm; Spatial interpolation is performed on the processed three-dimensional structural model to establish the porosity model.

5. The method as described in claim 3 or 4, characterized in that, The formation thermal conductivity model is established through the following steps: Based on the rock thermal conductivity data and the three-dimensional structural model, the rock thermal conductivity model is established; Based on the rock thermal conductivity model and the porosity model, the formation thermal conductivity model is established.

6. The method as described in claim 5, characterized in that, The formation thermal conductivity model is established through the following steps: Based on the rock thermal conductivity model and the porosity model, the first thermal conductivity and the first porosity of the rock in each layer are obtained respectively. The difference between the preset value and the first porosity is calculated and used as the first target value; The first porosity is used as the second target value; The formation thermal conductivity of the study area is obtained by multiplying the first target value of the first thermal conductivity by the second target value of the thermal conductivity of the geothermal fluid in the study area by the power of the first target value, so as to establish the formation thermal conductivity model.

7. The method according to any one of claims 3-6, characterized in that, The three-dimensional temperature field is established through the following steps: Based on the three-dimensional structural model and the heat flow data, the geothermal heat flow field of the study area is established; Based on the aforementioned geothermal flow field and the aforementioned stratum thermal conductivity model, a temperature increment model for the study area is established. The three-dimensional temperature field is obtained by summing the surface temperature with the summation result of the temperature increment model.

8. The method as described in claim 7, characterized in that, The temperature increment model is established through the following steps: Divide the geothermal flow field of each stratum by the corresponding stratum thermal conductivity model to obtain the geothermal gradient model; Divide the geothermal gradient model by the preset height value to obtain the temperature increment model.

9. A storage medium, characterized in that, It includes a series of instructions for performing the method steps as described in any one of claims 1-8.

10. A device for establishing a three-dimensional temperature field, characterized in that, The apparatus for performing the method as described in any one of claims 1-8 comprises: The first module is used to create a three-dimensional structural model of the study area; The second establishment module is used to establish a porosity model of the study area based on the three-dimensional construction model and the porosity data of the study area; The third module is used to establish a formation thermal conductivity model for the study area based on the porosity model and the thermal conductivity data of rocks in the study area. The fourth module is used to establish a three-dimensional temperature field of the study area based on the formation thermal conductivity model, the heat flow data of the study area, and the surface temperature.

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