Block forming method and device for geologic model

Abstract

The invention provides a block forming method and a block forming device for a geologic model. The method comprises the following steps of: interpolating a horizon / fault picked on a geological section, and performing triangular meshing on the interpolated point so as to form a horizon / fault surface in a three-dimensional space; extrapolating the formed horizon / fault according to a preset extrapolation algorithm, specifying an extrapolated closed horizon surface / fault surface, taking the extrapolated boundary surface as a closed boundary surface, intersecting the extrapolated horizon / fault surface and the extrapolated closed horizon / fault surface, and cutting to form an intersecting line segment so as to generate a complete geologic surface and form intersecting line segments or cutting lines between the intersected horizon / fault, between the horizons and between the faults; cutting the three-dimensional space based on the formed cutting lines and the extrapolated geologic surface so as to form a plurality of blocks and bodies; and automatically searching parent blocks, sub-blocks and sub-bodies according to the information of the intersecting line segments or cutting lines between the intersected horizon / fault, between the horizons and between the faults.

Description

technical field [0001] The present application relates to a method and device for forming a geological model into a block, in particular to a method for automatically forming a block when performing velocity modeling of a 2D and 3D geological model in petroleum seismic exploration. Background technique [0002] In the field of petroleum seismic exploration, pre-stack depth migration is one of the effective technologies to realize the spatial homing of geological structures. It is used to solve the superposition of common reflection points when the velocity has severe lateral changes and the velocity interface is not horizontal. The homing of diffraction points and complex structures can make correct imaging of seismic data with large lateral velocity changes. In the process of prestack depth migration, the correctness and accuracy of velocity modeling directly affect the effect of migration imaging. The block formation of 2D and 3D geological models is an important step in ...

AI Technical Summary

Problems solved by technology

[0005] 2. Layers need to be numbered complexly;

[0006] 3. Faults are also represented by horizon lines, which is not in common practice;

[0007] 4. It is difficult to describe complex geological structures

[0009] However, the existing model description methods have the following disadvantages: the results processed by the prior art are all one polygon, while in the processing of geological models, the result of mutual cutting of polygons is multiple polygons, that is, multiple blocks

In terms of model generation, the existing model generation methods are mostly manual intervention model generation, and sometimes it is necessary to manually outline the intersection line between the fault and the horizon, or outline the upper and lower walls of the fault, lacking the generation method of automatic block formation

[0016] From the above process introduction, it can be seen that in the various steps of the existing geological model into a block and model generation, a large number of manual editing, sketching and manual designation are required, the workload is huge, time-consuming, and the accuracy is very high. Rely on operator experience and skills

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