A 3D reconstruction method of closed surface of geological body based on seismic interpretation data

Abstract

The invention discloses a method for reconstructing a closed surface of a geological body from spatial discrete points obtained from seismic interpretation data, comprising: inputting discrete point data of the geological body from seismic interpretation; data regularization; B-spline fitting and resampling ;Create a normal vector field of discrete points in space; unify the direction of the normal vector; solve the Poisson equation; extract the isosurface; Laplace smoothing; mesh subdivision; Utilizing the invention, not only can directly use the seismic interpretation data to reconstruct the shape and structure of the underground closed body, but also can realize the arbitrary display, rotation and scaling of the geological body in the three-dimensional space. The invention can well solve the problems of surface closure and reconstruction accuracy in geological mass reconstruction given a small amount of sparse discrete point data. Compared with the traditional surface reconstruction method, the present invention is mainly used in the field of oil and gas exploration and development, and provides shape constraints and basis for three-dimensional geological modeling, reservoir modeling, and seismic facies analysis.

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...

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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

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