Velocity model establishing method based on dual-path integration and velocity model establishing system based on dual-path integration

Abstract

The invention discloses a velocity model establishing method based on dual-path integration and a velocity model establishing system based on dual-path integration. The method comprises the following steps: collecting target data; determining multiple to-be-selected velocity models needed for treating target data; acquiring a common imaging point gather corresponding to each to-be-selected velocity model; acquiring a curvature parameter and a migration result corresponding to each to-be-selected velocity model based on the common imaging point gather; performing twice weighted stacking on each migration result by use of the corresponding curvature parameter, so as to obtain two path integration imaging profiles; respectively calculating a coherent value of the corresponding imaging point gather corresponding to each to-be-selected velocity model and coherent values of the path integration imaging profiles; and determining a target velocity model among the to-be-selected velocity models based on the coherent values, wherein the target velocity model is used for establishing a final migration velocity model. According to the method and the system, curvature is adopted for weighing in a process of determining weighing parameters of paths, so that higher precision can be provided for velocity extraction, and further the velocity modeling quality is improved.

Description

technical field [0001] The invention relates to the technical field of mathematical models, in particular to a method and system for establishing a velocity model based on dual-path integrals. Background technique [0002] With the development of technology, velocity models are more and more widely used in various fields. For example, in seismic migration imaging, the velocity model is the core parameter for calculating the travel time of seismic waves, which usually determines the quality of seismic migration imaging. [0003] The conventional method used in actual production needs to calculate the velocity spectrum of the imaging gather first, and then manually pick the extreme point of the spectrum or the velocity point with better imaging on the velocity spectrum, and establish the velocity model through continuous iteration, so there is a low efficiency. The problem. [0004] However, the current dual-path integration velocity modeling scheme extracts the velocity mod...

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a method and system for establishing a velocity model based on dual-path integration, to solve the technical problem of low velocity model establishment accuracy in the prior art

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