A method for constructing a three-dimensional model using geological interface cutting

Abstract

The present invention belongs to the technical field of three-dimensional geological modeling, and specifically relates to a method for constructing a three-dimensional model by cutting a geological interface, comprising: step S1: establishing a cubic block model of a study area; step S2: establishing a surface model; step S3: inferring the geological interfaces between different strata and between strata and rock masses; step S4: cutting the block model with the surface and the geological interface in turn. The present invention can accurately construct a non-layered geological body by establishing a geological interface and cutting blocks.

Description

Technical Field

[0001] The invention belongs to the technical field of three-dimensional geological modeling, and in particular relates to a method for constructing a three-dimensional model by cutting a geological interface. Background Art

[0002] In recent years, with the development of computer technology, three-dimensional geological modeling has developed rapidly. Commonly used three-dimensional geological modeling methods include surface-based modeling methods, volume-based modeling methods, and hybrid modeling methods. Different modeling methods have different models. The existing modeling methods have a good effect on layered geological bodies. Among the complex geological bodies, there is also a type of non-layered geological body, which has a very complex spatial distribution and an extremely irregular shape. It extends in all directions in space, forming deformations of varying degrees. Among them, different non-layered geological bodies will have intersections and cuts. Intrusive rock masses also belong to non-layered geological bodies. Existing methods cannot model this type of geological body.

[0003] Therefore, it is urgent to develop a method for constructing a three-dimensional model for non-layered geological bodies. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a three-dimensional model by cutting using geological interfaces. By establishing geological interfaces and cutting blocks, non-layered geological bodies can be accurately constructed.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A method for constructing a three-dimensional model by cutting a geological interface, the method comprising the following steps:

[0007] Step S1: Establish a cubic block model of the study area;

[0008] Step S2: Establishing a surface model;

[0009] Step S3: inferring geological interfaces between different strata and between strata and rock masses;

[0010] Step S4: Cut the block model with the surface and geological interface in sequence.

[0011] The step S1 is specifically as follows: construct a cubic block model according to the actual situation of the study area, the length and width of the block model should meet the expected model length and width requirements, and the model height should be greater than the highest point of the surface model.

[0012] The step S2 specifically includes: importing the contour lines within the modeling range into the GOCAD software, and using the stratum fitting function of the software to fit the stratum surface into a real surface model according to the ups and downs of the contour lines.

[0013] The step S3 is specifically as follows:

[0014] Step S31: data preparation and processing;

[0015] Step S32: extracting geological boundaries between different strata and between strata and rock masses in the plan view and the three-dimensional cross-sectional view;

[0016] Step S33: Connect geological boundaries into geological interfaces.

[0017] The step S31 specifically includes: performing three-dimensional space conversion on the collected geological, geophysical, geochemical, remote sensing and drilling data by using operations such as translation, rotation and coordinate conversion, so as to convert the required data into three-dimensional real space.

[0018] The step S32 is specifically as follows: extracting the geological boundaries between different strata and between strata and rock masses in the plan view, and saving them as different files respectively; extracting the same geological boundaries in different profiles, and saving them as one file; then placing the same geological boundaries in the plan view and the profile under the same layer, and saving them as one file; extracting the boundaries between different strata and between strata and rock masses.

[0019] The step S33 specifically includes: using the function of open line to open line in the entity menu of 3DMINE software to connect the geological boundaries in each section to form a geological interface.

[0020] The step S4 is specifically as follows: first, the block model is cut with the surface to make the surface undulations of the block; then, according to the complexity of the geological interface, the block model is cut with the geological interface in order from complex to simple to obtain a three-dimensional solid model of the stratum and rock mass, and after combining the blocks, a three-dimensional geological model of the study area is finally established.

[0021] The beneficial technical effects of the present invention are:

[0022] The present invention provides a method for constructing a three-dimensional model by cutting a geological interface. The method solves the problem of how to construct a model of a non-layered stratum and adds a method for model construction. In the process of model construction, the contact relationship between various geological bodies can be clarified, the geological interface can be established, and each geological body can be accurately constructed. It has been applied in the modeling of specific non-layered stratum deposits and has achieved remarkable results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a method for constructing a three-dimensional model by cutting a geological interface provided by the present invention;

[0024] Figure 2 The cubic block model provided by the present invention;

[0025] Figure 3The surface model provided by the present invention;

[0026] Figure 4 A three-dimensional display of geological boundaries between different strata and between strata and rock masses provided by the present invention;

[0027] Figure 5 A three-dimensional display of the geological interface between different strata and between strata and rock mass provided by the present invention;

[0028] Figure 6 The block model remaining after surface cutting provided by the present invention;

[0029] Figure 7 The three-dimensional geological model after cutting the rock mass provided by the present invention;

[0030] Figure 8 The three-dimensional geological model after cutting the Heishantou Formation stratum provided by the present invention;

[0031] Fig. 9 The three-dimensional geological model after cutting the Tarbagatai Formation stratum provided by the present invention;

[0032] Fig.10 This is the three-dimensional geological model of the study area provided by the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, the present invention provides a method for constructing a three-dimensional model by cutting a geological interface, which specifically includes the following steps:

[0035] Step S1: Establish a cubic block model of the study area;

[0036] According to the actual situation of the study area, a cubic block model is constructed, such as Figure 2 As shown. First build the bottom surface of the cube, then build the top surface, and finally connect the bottom surface and the top surface to form a block model. The length and width of the block model should meet the requirements of the length and width of the modeling range, and the model height should be greater than the highest point of the surface model to facilitate later cutting.

[0037] Step S2: Establishing a surface model;

[0038] The surface model can truly reflect the ups and downs of the terrain and is an indispensable part of the three-dimensional geological model. In order to cut the block model later, the surface model range should be larger than the length and width of the block model. The contour lines within the modeling range are imported into the GOCAD software, and the stratigraphic fitting function of the software is used to fit the stratigraphic layer into the real surface model according to the ups and downs of the contour lines. Figure 3 shown.

[0039] Step S3: inferring geological interfaces between different strata and between strata and rock masses;

[0040] By integrating multi-source data such as geology, geophysical exploration and drilling, the geological interfaces between different strata and between strata and rock masses in the study area are inferred, the entire block model is cut, three-dimensional solid models of strata and rock masses are obtained, and a three-dimensional geological model of the study area is established.

[0041] Step S31: data preparation and processing;

[0042] The collected geological, geophysical and drilling data are converted into three-dimensional real space using the coordinate conversion function in the 3DMINE software tool menu. The plan view is converted to real coordinates, and the profile view is converted to the position of the real profile line.

[0043] Step S32: extracting geological boundaries between different strata and between strata and rock masses in the plan view and the three-dimensional cross-sectional view.

[0044] Extract the geological boundaries between different strata and between strata and rock mass in the plan view and save them as different files. Extract the same geological boundaries in different profiles and save them as one file. Then put the same geological boundaries in the plan view and profile on the same layer and save them as one file.

[0045] The study area contains the non-stratified Hebukehe Formation, Heishantou Formation and Tarbagatai Formation, as well as a granite outcrop. The geological boundaries between the various strata (Heishantou Formation and Hebukehe Formation and Hebukehe Formation and Tarbagatai Formation) and between the strata and the rock mass are extracted, such as Figure 4 shown.

[0046] Step S33: connecting geological boundaries into geological interfaces;

[0047] Use the open line to open line function in the entity menu of 3DMINE software to connect the geological boundaries in each section to form a geological interface.

[0048] The geological boundaries between the Heishantou Formation and the Hebukehe Formation, the Hebukehe Formation and the Tarbagatai Formation, and the Heishantou Formation and the Tarbagatai Formation, as well as the strata and rock masses, are connected into geological interfaces, such as Figure 5 As shown in the figure, since the block model will be cut later, the geological interface should be larger than the modeling range.

[0049] Step S4: cutting the block model with the surface and geological interface in sequence;

[0050] First, use the surface to cut the block model to make the surface undulation of the block, such as Figure 6Use the From Surfaces function in the model3d menu of the GOCAD software to cut the cubic block model created in step 1 into two parts, upper and lower, with the ground surface as the boundary, and save the required lower part.

[0051] According to the complexity of the geological interface, the saved block model is cut in order from complex to simple, that is, the saved block model is segmented in sequence with the geological interface using the From Surfaces function in the model3d menu of the GOCAD software until all geological bodies are segmented. The three-dimensional solid model of the stratum and rock mass is obtained, and finally the three-dimensional geological model of the study area is established.

[0052] The geological interface between the strata and the rock mass in the study area is the most complex, so this part is cut first. Figure 7 shown.

[0053] Then cut the remaining blocks after cutting the rock mass. Among the remaining geological interfaces, first cut the Heishantou Formation stratum, such as Figure 8 As shown, the remaining blocks are cut into the Tarbagatai Formation, as shown in Fig. 9 As shown, the remaining block is the Book River Formation.

[0054] The cut geological blocks were opened and a three-dimensional geological model of the study area was established. Fig.10 shown.

[0055] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A method for constructing a three-dimensional model by cutting a geological interface, characterized in that: The method comprises the following steps: Step S1: Establish a cubic block model of the study area; Step S2: Establishing a surface model; Step S3: inferring geological interfaces between different strata and between strata and rock masses; Step S4: Cut the block model with the surface and geological interface in turn; specifically: first cut the block model with the surface to make the surface undulation of the block; then cut the block model with the geological interface in order from complex to simple according to the complexity of the geological interface to obtain a three-dimensional solid model of the stratum and rock mass, and finally establish a three-dimensional geological model of the study area after combining the blocks.

2. The method for constructing a three-dimensional model by cutting a geological interface according to claim 1, characterized in that: The step S1 is specifically as follows: constructing a cubic block model according to the actual situation of the study area, the length and width of the block model should meet the expected model length and width requirements, and the model height should be greater than the highest point of the surface model.

3. The method for constructing a three-dimensional model by cutting a geological interface according to claim 1, characterized in that: The step S2 specifically includes: importing the contour lines within the modeling range into the GOCAD software, and using the stratum fitting function of the software to fit the stratum surface into a real surface model according to the ups and downs of the contour lines.

4. The method for constructing a three-dimensional model by cutting a geological interface according to claim 1, characterized in that: The step S3 is specifically as follows: Step S31: data preparation and processing; Step S32: extracting geological boundaries between different strata and between strata and rock masses in the plan view and the three-dimensional cross-sectional view; Step S33: Connect geological boundaries into geological interfaces.

5. The method for constructing a three-dimensional model by cutting a geological interface according to claim 4, characterized in that: The step S31 specifically includes: performing three-dimensional space conversion on the collected geological, geophysical, geochemical, remote sensing and drilling data by using operations such as translation, rotation and coordinate conversion, so as to convert the required data into three-dimensional real space.

6. The method for constructing a three-dimensional model by cutting a geological interface according to claim 4, characterized in that: The step S32 is specifically as follows: extracting the geological boundaries between different strata and between strata and rock masses in the plan view, and saving them as different files respectively; extracting the same geological boundaries in different profiles, and saving them as one file; then placing the same geological boundaries in the plan view and the profile under the same layer, and saving them as one file; extracting the boundaries between different strata and between strata and rock masses.

7. The method for constructing a three-dimensional model by cutting a geological interface according to claim 4, characterized in that: The step S33 specifically includes: using the function of open line to open line in the entity menu of 3DMINE software to connect the geological boundaries in each section to form a geological interface.

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