A 3D Velocity Geological Modeling Method with Random Arrangement of Structure and Velocity

Abstract

The present disclosure provides a three-dimensional velocity geological modeling method with random layout of structure and wave velocity, determining a base point in a three-dimensional space, establishing an equation according to the base point to determine a plane layered model, complicating the inclined layer of the plane layered model, and constructing a three-dimensional space The fold layer model of the upper surface; based on the 3D surface fold layer model, combined with the fault plane of random reference points and the displacement of each point in the global coordinate system, a 3D fault fold model is established; based on the 3D fault fold model, the structure containing salt domes is constructed. The velocity model simulates the upward intrusion of salt domes in a geological body of a certain depth; according to the set layer type, according to the set velocity range, and the wave velocity difference range between each layer, random The wave velocity amplitude is used to realize three-dimensional velocity modeling; the present disclosure increases the amount of model data when the deep learning method is used for geophysical inversion, and improves the inversion effect of the deep learning method.

Description

technical field [0001] The present disclosure belongs to the technical field of geophysical exploration, and relates to a three-dimensional velocity geological modeling method with random arrangement of structure and wave velocity. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As one of the most commonly used geophysical exploration methods, seismic method is widely used in petroleum exploration, coal field and metal mineral exploration, etc., and has broad application prospects. The main principle of the seismic method is based on wave field propagation. Multiple geophones are arranged on the surface, and the wave field is generated by repeatedly exciting the artificial seismic source and propagates in the underground medium. When the wave impedance changes in the underground medium, it is reflected or refracted back to the ground. Ge...

AI Technical Summary

Problems solved by technology

[0011] The geological model is formed through geological movement, which has great randomness, regionality, and geological history information at the same time. Therefore, if you want to generate a velocity model that can simulate real geological information through functions, you need to conform to the general laws of the stratum and at the same time There is enough randomness to avoid model repetition, which is difficult

[0012] 2) It is difficult to achieve rapid modeling under the premise of ensuring the complexity of the model;

[0013] When building a model, it is necessary to randomly select parameters and generate a speed model within a reasonable range. It is necessary to ensure the complexity of the model, which puts forward higher requirements for parameter selection, and further realizes the difficulty of fast random speed modeling.

Images