Three-dimensional surface layer model construction method based on triangular grid

Abstract

The invention discloses a three-dimensional surface layer model construction method based on a triangular grid, which comprises the following steps: measuring surface layer survey points in an area so as to directly or indirectly obtain geographic position information and a surface layer model parameter of each surface layer survey point; acquiring the geographic position information of all shot detection points in the area; carrying out triangulation on a two-dimensional point set formed by the geographic position information of the surface layer survey points, so as to obtain a Delaunay triangular grid; finding the triangle where each shot detection point is arranged, and using the surface layer survey points in the positions of three vertices of the triangle as control points to calculate the surface layer model parameter Vp of each shot detection point based on an area-weighted interpolation method, as a result, a three-dimensional surface layer model in the area is obtained.

Description

technical field [0001] The invention relates to geophysical prospecting technology, and more specifically, relates to a three-dimensional surface model construction method based on triangular grids that can almost accurately reflect the near-surface structure. Background technique [0002] At present, the main battlefields of seismic exploration in my country are mainly concentrated in complex surface areas such as mountains, deserts, and loess plateaus. The surface conditions they face are extremely complex, and different areas have different surface characteristics. In the case of large changes, the surface problem is the primary problem in seismic exploration. [0003] Theories of seismic exploration interpretation all assume that the excitation point and the receiving point are on the same horizontal plane, and the formation velocity is uniform. But in fact, the ground is often uneven, the depth of each excitation point may be different, and the wave speed in the low-vel...

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Problems solved by technology

However, it is very difficult to obtain a model that conforms to the surface geological laws. The number of control points and the understanding of the depositional laws of the area all affect the interpretation results of the surface points.

In addition, even if the model at the surface control point can be truly determined, the shape of the low-speed interface between the surface points is often not accurately confirmed, which will cause deviations in the model, thereby affecting the accuracy of the correction amount and processing accuracy

[0007] In the past, most of the modeling methods used the distance-weighted thickness linear interpolation method, and then adjusted the thickness segment by segment. This kind of work is not only cumbersome, but also inefficient, and it is not easy to reflect the change law of the surface model on the entire surface, which is affected by human factors. Larger, interpreted results with uncertainty

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