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A Method for Establishing a Hybrid Grid Model for Rugged Seafloor

A hybrid grid and model building technology, which is applied to the field of hybrid grid model establishment for rugged seabeds, can solve problems such as complex equations, large grid calculations, and multi-grid generation costs, so as to ensure stability and improve computational efficiency. Efficiency, Avoidance of Boundary Diffraction and Corner Scattering Effects

Active Publication Date: 2015-12-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although no approximation is made to the irregular interface, generating such a mesh requires solving a system of linear equations, and such a system of linear equations is very large when solving a three-dimensional problem, and the calculation amount consumed by the resulting mesh generation is even greater. Large, that is, more additional grid generation costs need to be paid
At the same time, from the perspective of numerical calculation, the non-uniformity of the curved grid is very strong, and the numerical calculation directly on this grid will inevitably encounter some additional difficulties
Of course, the numerical solutions of the curved grid technology are basically carried out in the curved coordinate system, but most of the physical property equations in the curved coordinate system are much more complicated than those in the Cartesian coordinate system. The bigger problem is that these equations (such as the Eikonal equation , this equation is a nonlinear equation) in numerical implementation, it is difficult to guarantee numerical stability due to the influence of grid generation quality

Method used

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  • A Method for Establishing a Hybrid Grid Model for Rugged Seafloor
  • A Method for Establishing a Hybrid Grid Model for Rugged Seafloor
  • A Method for Establishing a Hybrid Grid Model for Rugged Seafloor

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Embodiment 1

[0025] like figure 2 As shown, according to the published data "Analysis of Factors Affecting Seismic Data Quality in Deep Water Area of ​​Qiongdongnan Basin" (Deng Yong, Li Lie, Chai Jitang, etc., China Offshore Oil and Gas, 2010, 22 (6): 381-386), the present invention establishes A model of drastic change of slope break water depth in Baodao Sag, northern Qiongdongnan Basin. The velocity parameter distribution of the model medium is shown in the figure, based on the model building method of the present invention, adopt 22 * ​​10 (the number of grids is far more than this when calculating the actual value, here for the convenience of display, fewer grids are used, The same as the following, and will not be described in detail) the model is divided into meshes.

Embodiment 2

[0027] like image 3 As shown, according to the published data "Geometric form and deformation characteristics of Baiyun large-scale submarine landslide in the northern South China Sea" (Sun Yunbao, Wu Shiguo, Wang Zhijun, etc., Marine Geology and Quaternary Geology, 2008, 28 (6): 69-77) the present invention A valley model of the fault block at the root of the landslide in Baiyun Sag perpendicular to the strike of the landslide was established. The figure shows the density parameter distribution of the model medium, and based on the model building method of the present invention, the model is subdivided with a 22×12 grid.

[0028] like Figure 4 As shown, the present invention uses the mixed grid method to divide the irregular calculation boundary, firstly through the division with the square ladder grid (such as Figure 5 (shown) comparison, it can be found that: the shape of the rugged seabed is very roughly described by the square stepped grid, and the shape of the rough ...

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Abstract

The invention relates to a rugged seabed aimed hybrid grid model building method. The rugged seabed aimed hybrid grid model building method comprises the following steps of: 1) reading the water depth, the scale of a calculation area and the distribution information of physical property parameters of media of a rugged seabed; 2) constructing an integral model frame according to the water depth, the scale of the calculation area and the distribution information of the physical property parameters of the media of the rugged seabed; 3) subdividing the integral model frame which is constructed in the step 2) by square grids; 4) subdividing a neighboring area of the rugged seabed by using triangular grids; 5) calculating the physical property parameters on grid nodes by a weighted average method according to the distribution of the physical property parameters and geometric area information of neighboring grid unit media of the grid nodes; and 6) storing the physical property parameters and calculation parameter information on the grid nodes for outputting. By the method, the shape of the rugged seabed can be described accurately, the calculation efficiency can be improved, the stability of an algorithm can be ensured, and the problems of boundary diffraction, angular point scattering and the like can be solved. The rugged seabed aimed hybrid grid model building method can be widely applied to fields of earthquake forward modeling, tomography, migration imaging, speed modeling and the like under the condition of the rugged seabed.

Description

technical field [0001] The invention relates to a method for establishing a seismic exploration model, in particular to a method for establishing a mixed grid model for rugged seabeds. Background technique [0002] Rugged seabeds are a common problem encountered in marine seismic surveys. The accurate and detailed model building method for rough seabed is a basic tool for researching seismic forward modeling, data processing and other technologies under rough seabed conditions. Therefore, it is necessary to study specifically the modeling method for the rough seabed. The core problem that the model building method needs to solve is the meshing problem of the model. In terms of numerical calculation, the key technical issue involved in the meshing of the rugged seabed model is the description of the irregular calculation boundary. When dealing with the grid generation problem similar to the irregular calculation boundary caused by the rough seabed, the existing technologie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 刘春成孙建国陈宝书王雪秋汪小将孙章庆杨小椿叶云飞仝中飞
Owner CHINA NAT OFFSHORE OIL CORP