Three-dimensional reconstruction method for geological body closed surface based on seismic interpretation data

Abstract

The invention discloses a method for reconstructing a geological body closed surface based on spatial discrete points obtained from seismic interpretation data. The method comprises the steps of: inputting discrete point data of a geological body for seismic interpretation; regularizing the data; performing B-spline fitting and re-sampling; creating a spatial discrete point normal vector field; unifying the normal vector direction; solving a Poisson equation; extracting a contour surface; performing Laplacian smoothing; subdividing meshes; performing anti-regularization; and outputting the reconstructed Poisson curve. By using the method, not only can an underground closed body shape structure be reconstructed with direct use of the seismic interpretation data, but also any display, rotation and scaling of the geological body within the three-dimensional space can be realized. The method can well solve the problems of surface closing and reconstruction precision in geological body reconstruction with the use of a small amount of given sparse discrete point data. Compared with the traditional surface reconstruction method, the method is mainly applied in the field of oil-gas exploration and development, and provides morphological constraints and basis for three-dimensional geological modeling, reservoir modeling, seismic phase spread analysis and the like.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, in particular to a method for three-dimensional reconstruction of a closed curved surface of a geological body based on seismic interpretation data. Background technique [0002] The current 3D geological modeling originated from the computer-aided design technology developed in oil fields to meet the needs of oil and gas resource management and production design. The so-called 3D geological modeling technology refers to the use of computer technology to combine tools such as spatial information management, geological interpretation, spatial analysis and prediction, geological statistics, entity content analysis, and graphic visualization in a 3D environment. The mathematical model of geological characteristics such as morphology, the relationship between various structural elements, and the spatial physical property distribution of geological bodies is used for geological ana...

AI Technical Summary

Problems solved by technology

The existing surface reconstruction methods have the following problems: (1) The existing surface reconstruction methods are mainly based on the geometric constraints of point clouds, which are not suitable for reconstructing geological surfaces with few sampling points; (3) Even if the functional surface in the field of reconstruction engineering can meet the requirements of geometric accuracy, it is difficult to meet its physical performance requirements

Images