Method for generating ground layer surface and geologic body based on level set

Abstract

The invention discloses a bedding surface based on a level set and a method for generating a geologic body, which is applied to a system for geologic modeling, simulation and analysis. The method is characterized by comprising the steps: a sectional model is built, and a three-dimensional computational grid is formed on the basis of the sectional model; a scalar field used for calculating the flowing speed of a computational interface is formed in each bedding surface according to bedding surface discrete points; an initial level set is built according to the bedding surface discrete points; numerical solutions to the partial differential equation about the flowing of the interface are carried out in the three-dimensional grid, which causes the level set to update so as to lead to the evolution of the moveable interface, finally drawing near to a target bedding surface; a final strata surface is obtained by tracing a zero contour surface; the level set corresponding to each bedding surface is utilized to realize the description of the boundary and interior of the geologic body. The invention can realize the automatic reconstruction of bedding surfaces and geologic bodies of a plurality of faults at complicated geologic states, such as overthrust faults, mushroom bodies, salt domes, lenticular bodies, and the like, and effectively improve the generating efficiency and precision of complicated geologic structure models.

Description

technical field [0001] The invention relates to a system and method for computer geological modeling, simulation and analysis based on seismic interpretation data and logging interpretation result data, in particular to a level set-based method for generating formation layers and geological bodies. Background technique [0002] In the process of exploration and development of modern oil and gas reservoirs and other resources, it is necessary to establish a subsurface geological model in the computer based on seismic exploration data, well logging and other data, and carry out numerical simulation and analysis in order to more accurately understand the subsurface geological situation and effectively develop and utilize it. The establishment of a geological model includes geological structure modeling and attribute modeling. The attribute model uses the structural model as a carrier to describe the attribute distribution inside the geological body. Practice has shown that the e...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a convenient method for generating layers and geological bodies under complex geological forms—a method for generating layers and geological bodies based on level sets, which is used for geological modeling, simulation and analysis. system, to solve the problem that the existing technology requires a lot of manual interaction when there are many faults, including salt domes, mushroom bodies, lenses, etc. or it is difficult to generate layers and the existing layer generation technology lacks the ability to directly describe the interior of geological bodies, thus It effectively overcomes the problems of low precision, low efficiency and difficulty in effectively supporting geological modeling, simulation and analysis in the existing technology

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