Method and system for establishing geological three-dimensional model based on geophysical prospecting and drilling data interaction verification

Abstract

The invention belongs to the field of geological three-dimensional modeling, and particularly relates to a method and system for establishing a geological three-dimensional model based on geophysical prospecting and drilling data interactive verification, and the method comprises the steps: S1, drilling data input, S2, drilling geometric model (A) establishment, S3, geophysical prospecting data input, S4, geophysical prospecting attribute model (B) establishment, S5, stratum automatic division rule and parameter input, and S6, geophysical prospecting attribute model (B) correction. According to the method, the three-dimensional models are established on the basis of geophysical prospecting and drilling data, and the geological three-dimensional model is established through comparative analysis and interactive verification, and an application precedent of combining the drilling data and the geophysical prospecting data in the geological three-dimensional modeling field is provided; the method is suitable for the field of geological three-dimensional modeling of various engineering types, and is especially suitable for geological three-dimensional modeling under the condition of sparse drilling data or insufficient data support.

Description

Technical Field

[0001] The present invention belongs to the field of geological three-dimensional modeling, and in particular relates to a method and system for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data. Background Art

[0002] With the comprehensive advancement of policies related to building a realistic 3D China, encompassing "above and below ground, on land and at sea, and in two and three dimensions," underground 3D modeling technology is becoming increasingly important, significantly impacting the development of a digital economy and society. In the field of engineering geological 3D modeling, the refinement of underground geological models still presents technical and structural challenges. By developing methods and systems for establishing geological 3D models based on interactive verification of geophysical and drilling data, we can achieve refined and rapid modeling of geological models, effectively improving their accuracy and efficiency and laying a solid foundation for the comprehensive application of realistic 3D systems.

[0003] Currently, traditional geological 3D modeling methods primarily utilize a single data-driven modeling technology based on drilling data. Based on the borehole data collected within the target modeling range, geological 3D modeling is completed through subjective manual inference and automatic interpolation. This method of establishing geological 3D modeling based on a single drilling data drive has certain drawbacks. When the borehole distribution interval exceeds the modeling accuracy, the stratification of the geological 3D modeling is mainly based on subjective inference, and the geological 3D modeling work is not carried out through a reasonable process of modeling, analysis, correction, and updating. The current methods and processes for geological 3D modeling are as follows: (1) Organize and input the project standard stratigraphic data; (2) Organize and input drilling profile and stratigraphic data; (3) Determine the modeling scope and filter the drilling data within the scope; (4) Draw a cross-section and manually infer the stratigraphic boundary (this step can be omitted); (5) The software automatically interpolates and models the model and outputs the model results.

[0004] The traditional geological 3D modeling methods mentioned above rely solely on single drilling data, making it difficult to accurately reflect the actual situation of the underground structure of the project and having application limitations. The current modeling methods and processes mainly have the following problems: (1) Because drilling data is point data, in most cases the original data is scattered and the borehole spacing is large, the constructed 3D geological model has the problem of insufficient accuracy; (2) When drilling data is insufficient, geological engineers will add auxiliary sections to participate in modeling based on their experience. Due to the influence of subjective cognition, different engineers have different interpretations of stratigraphic layers, resulting in a strong subjective dependence on the modeling results and poor consistency of the model results. (3) The modeling technology relies on automatic interpolation of software. When the amount of data is insufficient, the modeling results may not stand up to scrutiny. Since the model results have not been corrected and updated, the accuracy is low.

[0005] The present invention designs a method and system for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data to solve the above problems. Summary of the Invention

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data, comprising: S1: Drilling data input: Drilling data involved in building a geological 3D model is imported into the system. The drilling data includes borehole coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness, etc. The type of each data is defined and the drilling data involved in modeling is stored; S2: Drilling geometry model (A) establishment: Determine the modeling scope and accuracy, and automatically establish the drilling geometry model (A) layer by layer based on the drilling data within the scope, the stratigraphic sequence, and the exposed range of the drilled strata using the system's built-in stratigraphic interpolation and analysis algorithm. S3: Geophysical data input: importing geophysical data involved in building a geological 3D model into the system, including wave velocity, resistivity and other data, defining the type of each data and storing the geophysical data involved in modeling; S4: Geophysical attribute model (B) establishment: Determine the modeling scope and accuracy, and automatically establish the geophysical attribute model (B) based on the geophysical data within the scope through the system's built-in grid generation and spatial interpolation calculation technology; S5: Automatic stratum division rules and parameter input: Based on the geophysical attribute model (B), set the rules for lithologic division of different strata and input the stratification threshold parameters as the basis for stratification definition of the geophysical attribute model (B); S6: Correction of geophysical attribute model (B): Based on the stratigraphic information of the drilling geometry model (A) in S2 and the stratigraphic information of the geophysical attribute model (B) in S5, the differences between the two analysis models are compared, and the geophysical attribute model (B) is corrected by defining the layers according to the key point data (drill hole locations) of the drilling geometry model (A). S7: Drilling geometry model (A) update: Based on the geophysical attribute model (B) corrected in S6, the stratigraphic layer information of the geophysical attribute model (B) in the area not covered by the borehole is extracted, and the drilling geometry model (A) is updated through collaborative updating and adaptive modeling technology; S8: Geological 3D model (C) output: Based on the drilling geometry model (A) updated in S7, the system model output module is used to complete the geological 3D model (C) output.

[0007] As a preferred solution, in step S5, the parameters of stratum division are calculated using the lithology, depth, logging data and other data of the borehole as constraints, and the parameter calculation results are used as the parameter input basis for the correction of the geophysical attribute model (B).

[0008] As a preferred solution, in step S6, the differences in stratigraphic information of the drilling geometry model (A) and the geophysical attribute model (B) are compared and analyzed by calculating the positive and negative deviations of key drilling positions within the range, and the key point data (drilling positions) of the drilling geometry model (A) are defined in layers by calculating the model in the form of weighted average or the like.

[0009] A system for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data, used in any of the above methods for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data, comprising: Drilling data input module: The drilling data input module is used to input and store data such as drilling coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness, etc.; Drilling geometry model building module: the drilling geometry model building module is used to automatically establish a drilling geometry model (A) driven by drilling data; Geophysical data input module: The geophysical data input module is used to input and store data such as the plane coordinates of the survey line, depth of the survey point, coordinates of the survey point, and measured values of methods such as wave velocity and resistivity; Geophysical property model building module: The geophysical property model building module is used to automatically establish a geophysical property model (B) based on physical property data such as wave velocity and resistivity through grid generation and spatial interpolation calculation methods; Model comparison analysis and automatic update module: The model comparison analysis and automatic update module is used for comparison analysis, interactive verification and dynamic automatic update of the drilling geometry model (A) and the geophysical property model (B); Model output module: The model output module is used to output the corrected and updated drilling geometric model (A) into a geological three-dimensional model (C) for subsequent professional applications in the project.

[0010] Compared with the existing technology, the advantages of the present invention are: 1. This invention proposes for the first time a geological three-dimensional modeling method based on the collaboration of geophysical exploration and drilling data, breaking through the limitation of traditional modeling that relies solely on drilling data and realizing data fusion innovation.

[0011] 2. The present invention utilizes the spatial continuity characteristics of geophysical data to effectively compensate for the problem of insufficient modeling accuracy caused by the point distribution of drilling data.

[0012] 3. The present invention realizes the automation of the modeling process through the interactive modeling method of geophysical exploration and drilling data, eliminates the subjective errors caused by manual assisted modeling, ensures the consistency of the models built by the same set of data, and makes the modeling results more accurate and reasonable.

[0013] 4. The method of establishing three-dimensional geological modeling based on the interactive verification of geophysical and drilling data in the present invention has the advantages that drilling data has the characteristics of visibility and discontinuity, while geophysical data has the characteristics of invisibility and continuity. It fully utilizes the advantages of these characteristics to establish a two-way verification and update mechanism, effectively improving the accuracy of the geological three-dimensional model results.

[0014] 5. The present invention establishes a 3D geological modeling system based on interactive verification of geophysical and drilling data. It has the ability to quickly process geophysical and drilling data, integrates professional algorithms such as intelligent 3D modeling, model correction, and model updating, and the standardized process greatly improves the efficiency of engineering geological 3D modeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a flow chart of the steps of the present invention; Figure 2 is a diagram of drilling data input in an embodiment of the present invention; Figure 3 is a schematic diagram of a drilling geometry model in an embodiment of the present invention; Figure 4 This is a diagram of geophysical data input in an embodiment of the present invention; Figure 5 Schematic diagram of a geophysical property model in an embodiment of the present invention; Figure 6 Schematic diagram of stratigraphic division and interpretation of geophysical attribute model in an embodiment of the present invention Figure 7 Schematic diagram of interactive verification between drilling geometry model and geophysical property model in an embodiment of the present invention; Figure 8 3D geological model after updating in the embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] It should be noted that in the present invention, the drilling geometry model is defined as A, the geophysical property model is defined as B, and the geological three-dimensional model is defined as C. The method and system for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data provided in the present invention are applicable to geological three-dimensional modeling work driven by drilling data and geophysical data in various engineering fields such as water conservancy and hydropower, municipal transportation, new energy, and mineral exploration.

[0018] Example 1:

[0019] A method for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data, such as Figure 1 Shown, including: S1: Drilling data input: Drilling data involved in building a geological 3D model is imported into the system. The drilling data includes borehole coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness and other data. The type of each data is defined and the drilling data involved in modeling is stored, such as Figure 2 shown.

[0020] S2: Drilling geometry model (A) establishment: Determine the modeling scope and accuracy, establish a borehole model based on the drilling data within the scope, establish a parameterized drilling model based on the coordinates of the borehole, the hole elevation and the stratum depth information, and automatically establish the drilling geometry model (A) layer by layer according to the stratigraphic sequence and the exposed range of the drilled strata using the system's built-in stratigraphic interpolation analysis algorithm. According to the stratum exposure of adjacent boreholes, the development range and thickness of the same stratum in different boreholes are determined by interpolation. According to the topographic surface from top to bottom and the order of stratum development, the stratum morphology is inferred layer by layer and a stratum model is established. Finally, the drilling geometry model (A) driven by the borehole data is established. The structural morphology of the drilling geometry model (A) is as follows: Figure 3 shown.

[0021] S3: Geophysical data input: Import the geophysical data involved in building the geological three-dimensional model into the system. The geophysical data includes wave velocity, resistivity and other data. Define the type of each data and store the geophysical data involved in modeling, such as Figure 4 shown.

[0022] S4: Geophysical property model (B) establishment: Determine the modeling scope and accuracy, and automatically establish the geophysical property model (B) based on the geophysical data within the scope through the system's built-in grid division and spatial interpolation calculation technology. First, determine the modeling scope and accuracy, read the geophysical data within the scope, and the system automatically queries the geophysical attribute data range and sets the corresponding RGB color band as the basis for model coloring and rendering. Then import the continuous geophysical data of each survey line and each survey point, and establish a point model as the basis for model assignment. Then, establish an enclosing cube model based on the modeling scope, and complete the model grid division according to the modeling accuracy as the basis for model assignment and rendering. Finally, find the geophysical point data in each cube after division, complete the grid assignment by querying and taking the average value, and complete the model coloring according to the RGB color band. The structural form of the geophysical attribute model (B) established through the process of section-assignment-coloring-rendering is shown below. Figure 5 shown.

[0023] S5: Automatic stratum division rules and parameter input: Based on the geophysical attribute model (B), set the rules for lithologic division of different strata and input the layer threshold parameters as the basis for the layer definition of the geophysical attribute model (B). According to the correlation between the rock physical properties and geometric parameters of the geological body, the geophysical data inversion and comprehensive interpretation technology are applied to determine the rules for stratigraphic division, and the corresponding stratigraphic stratification threshold is input as the calculation parameter to complete the stratigraphic stratification interpretation. According to the grid division accuracy of the geophysical attribute model (B) established in step S4, the geophysical attribute model (B) is divided into N horizontal and vertical sections. Through the above-mentioned stratigraphic layer interpretation technology and method, the stratigraphic automatic division in the overall three-dimensional model space is completed by solving geometric constraints, such as Figure 6 shown.

[0024] S6: Correction of geophysical attribute model (B): Based on the stratigraphic information of the drilling geometry model (A) in S2 and the stratigraphic information of the geophysical attribute model (B) in S5, the differences between the two analysis models are compared, and the geophysical attribute model (B) is corrected based on the key point data (drill hole positions) of the drilling geometry model (A). Figure 7 and Figure 8 As shown, Specifically include the following: (1) Model integration: Integrate the drilling geometry model (A) output from step S2 and the geophysical property model (B) output from step S4 into the same system; (2) Model comparison and analysis: The system extracts the stratigraphic interface model of the drilling geometry model (A), identifies and marks the key points of the borehole revealed in the model, obtains the stratum information of the key points, and compares and analyzes it with the stratigraphic interface model in the geophysical attribute model (B) output in step S5. The stratigraphic boundary depths of the drilling geometry model (A) and the geophysical attribute model (B) corresponding to the marked key points are obtained, the differences between the two are compared, and statistical analysis is performed; (3) Model correction: Based on the results of the stratigraphic boundary difference analysis of the drilling geometry model (A) and the geophysical attribute model (B), the marked key points of the borehole are used as reference points. The influence range and the degree of model correction are determined according to the distance. While keeping the stratigraphic boundary depth of the drilling geometry model (A) at the reference point unchanged, the stratigraphic interface of the geophysical attribute model (B) is corrected in the form of infinite approximation and smooth transition to ensure the correctness of the stratum data of the geophysical attribute model (B) at the marked key points of the borehole, and to approximate the stratigraphic interpretation results of step S5 to the greatest extent, and finally complete the correction of the geophysical attribute model (B).

[0025] S7: Drilling geometry model (A) update: Based on the geophysical property model (B) corrected in S6, the stratigraphic information of the geophysical property model (B) in the area not covered by the borehole is extracted, and the stratigraphic information is updated through collaborative updating and adaptive modeling technology. Verify the consistency between the corrected geophysical attribute model (B) and the borehole layer data in the drilling geometry model (A). Extract the stratigraphic point data of the geophysical attribute model (B) in the area not covered by the borehole. Generate an updated stratigraphic interface model through grid fitting. Update the drilling geometry model (A) through collaborative updating and adaptive modeling technology.

[0026] S8: Geological 3D model (C) output: Based on the drilling geometry model (A) updated in S7, the system model output module is used to attach key attribute information of the geological 3D model, eliminate unnecessary model objects, and complete the geological 3D model (C) output.

[0027] Example 2:

[0028] A system for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data, comprising: Drilling data input module: The drilling data input module is used to input and store data such as drilling coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness, etc.; Drilling geometry model building module: the drilling geometry model building module is used to automatically establish a drilling geometry model (A) driven by drilling data; Geophysical data input module: The geophysical data input module is used to input and store data such as the plane coordinates of the survey line, depth of the survey point, coordinates of the survey point, and measured values of methods such as wave velocity and resistivity; Geophysical property model building module: The geophysical property model building module is used to automatically establish a geophysical property model (B) based on physical property data such as wave velocity and resistivity through grid generation and spatial interpolation calculation methods; Model comparison analysis and automatic update module: The model comparison analysis and automatic update module is used for comparison analysis, interactive verification and dynamic automatic update of the drilling geometry model (A) and the geophysical property model (B); Model output module: The model output module is used to output the corrected and updated drilling geometric model (A) into a geological three-dimensional model (C) for subsequent professional applications in the project.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data, characterized in that: include: S1: Drilling data input: Drilling data involved in building a geological 3D model is imported into the system. The drilling data includes borehole coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness, etc. The type of each data is defined and the drilling data involved in modeling is stored; S2: Drilling geometry model (A) establishment: Determine the modeling scope and accuracy, and automatically establish the drilling geometry model (A) layer by layer based on the drilling data within the scope, the stratigraphic sequence, and the exposed range of the drilled strata using the system's built-in stratigraphic interpolation and analysis algorithm. S3: Geophysical data input: importing geophysical data involved in building a geological 3D model into the system, including wave velocity, resistivity and other data, defining the type of each data and storing the geophysical data involved in modeling; S4: Geophysical attribute model (B) establishment: Determine the modeling scope and accuracy, and automatically establish the geophysical attribute model (B) based on the geophysical data within the scope through the system's built-in grid generation and spatial interpolation calculation technology; S5: Automatic stratum division rules and parameter input: Based on the geophysical attribute model (B), set the rules for lithologic division of different strata and input the stratification threshold parameters as the basis for stratification definition of the geophysical attribute model (B); S6: Correction of geophysical attribute model (B): Based on the stratigraphic information of the drilling geometry model (A) in S2 and the stratigraphic information of the geophysical attribute model (B) in S5, the differences between the two analysis models are compared, and the geophysical attribute model (B) is corrected by defining the layers according to the key point data (drill hole locations) of the drilling geometry model (A). S7: Drilling geometry model (A) update: Based on the geophysical attribute model (B) corrected in S6, the stratigraphic layer information of the geophysical attribute model (B) in the area not covered by the borehole is extracted, and the drilling geometry model (A) is updated through collaborative updating and adaptive modeling technology; S8: Geological 3D model (C) output: Based on the drilling geometry model (A) updated in S7, the system model output module is used to complete the geological 3D model (C) output.

2. The method for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data according to claim 1, characterized in that: In step S5, the parameters of stratum division are calculated using the lithology, depth, logging data and other data of the borehole as constraints, and the parameter calculation results are used as the parameter input basis for the correction of the geophysical attribute model (B).

3. The method for establishing a geological three-dimensional model based on interactive verification of geophysical and drilling data according to claim 1, characterized in that: In step S6, the differences in stratigraphic information between the drilling geometry model (A) and the geophysical attribute model (B) are compared and analyzed by calculating the positive and negative deviations of key borehole positions within the range, and the geophysical attribute model (B) is corrected by calculating the model in the form of weighted average and the key point data (borehole positions) of the drilling geometry model (A) are used to define the layers.

4. A system for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data, used in a method for establishing a geological three-dimensional model based on interactive verification of geophysical exploration and drilling data as claimed in any one of claims 1 to 3, characterized in that: include: Drilling data input module: The drilling data input module is used to input and store data such as drilling coordinates, hole elevation, stratigraphic sequence, stratigraphic number, lithology name, layer thickness, etc.; Drilling geometry model building module: the drilling geometry model building module is used to automatically establish a drilling geometry model (A) driven by drilling data; Geophysical data input module: The geophysical data input module is used to input and store data such as the plane coordinates of the survey line, depth of the survey point, coordinates of the survey point, and measured values of methods such as wave velocity and resistivity; Geophysical property model building module: The geophysical property model building module is used to automatically establish a geophysical property model (B) based on physical property data such as wave velocity and resistivity through grid generation and spatial interpolation calculation methods; Model comparison analysis and automatic update module: The model comparison analysis and automatic update module is used for comparison analysis, interactive verification and dynamic automatic update of the drilling geometry model (A) and the geophysical property model (B); Model output module: The model output module is used to output the corrected and updated drilling geometric model (A) into a geological three-dimensional model (C) for subsequent professional applications in the project.

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