Seismic anisotropy parameter full waveform inversion method and device

Abstract

The invention provides a seismic anisotropy parameter full waveform inversion method and device, and belongs to the field of seismic anisotropy parameter prediction in oil geophysical exploration. The method comprises the steps that (1) seismic data which are going to carry out anisotropy parameter inversion are acquired, namely observation wave field data; (2) denoising processing is carried out on the seismic data acquired in the step (1) to acquire denoised data; (3) by using the denoised data acquired in the step (2), and according to shot point and receiver point coordinates, a common midpoint gather is extracted to acquire seismic CMP gather information, and then the seismic CMP gather information is used to calculate the interval velocity of a horizontal stratum; (4) by using the interval velocity, which is acquired in the step (3), of the horizontal stratum, an initial model used for inversion is constructed in an interpolation mode; and (5) small perturbation is carried out on each parameter of the initial model to generate a model after parameter perturbation.

Description

technical field [0001] The invention belongs to the field of seismic anisotropy parameter prediction in petroleum geophysical exploration, and in particular relates to a seismic anisotropy parameter full waveform inversion method and device. Background technique [0002] The formations that hold oil and natural gas are called oil and gas reservoirs. The purpose of petroleum exploration is to comprehensively use petroleum geophysical prospecting technology, petroleum logging technology, petroleum geological exploration technology, etc. to find underground reservoirs that store oil and natural gas. This is reservoir prediction in a broad sense. [0003] Anisotropic characteristics of subsurface rock formations and hydrocarbon reservoirs are ubiquitous. However, most of the existing velocity analysis techniques, reservoir prediction techniques and model building techniques are based on the assumption of isotropy, which is often quite different from the actual geological condit...

AI Technical Summary

Problems solved by technology

However, the P-wave data recorded on the surface are insufficient to estimate all the anisotropy parameters in the depth domain

Images