Method and system for orthogonal anisotropy velocity inversion

An orthotropic and velocity inversion technology, applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of affecting the velocity accuracy of azimuth anisotropy, reducing the azimuth accuracy, and affecting the accuracy of parameter calculation, etc., to achieve high efficiency Calculate the orthotropic velocity, improve the pick-up accuracy, and improve the effect of imaging accuracy
CN112130202AActive Publication Date: 2020-12-25BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2020-12-25

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Abstract

The invention provides a method and system for orthogonal anisotropy velocity inversion. The method comprises the steps that an imaging point gather and superposition data are collected; cross-correlation calculation is conducted in a user-defined processing time window through a model trace and each seismic data trace in the imaging point gather; cross-correlation calculation is conducted on eachcross-correlation time window of current seismic data; all the seismic data traces in the current imaging point gather are processed; according to residual time difference data and correlation coefficient data of the current imaging point gather and pre-stack time migration velocity field data, HTI anisotropy velocity parameters of the current imaging point gather on all zero offset data sample points are obtained through calculation by means of a weighted least square algorithm; VTI anisotropy velocity parameters are obtained according to HTI anisotropy velocities and residual time difference parts; and each imaging point gather is processed, and orthogonal anisotropy velocity inversion results of all the seismic data are obtained. The method has the advantages that the calculation efficiency is high, and the calculation result precision is high.
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Description

Technical field

[0001] The invention relates to the technical field of wide-azimuth seismic data processing for geophysical prospecting, in particular to a method and system for orthogonal anisotropic velocity inversion.Background technique

[0002] After oil and gas development and production practice and experience summary, the sedimentary rock storing oil and gas is often a layered structure. When the layered structure causes the seismic wave to propagate in the rock formation, the speed of horizontal propagation is often greater than the speed of vertical propagation; therefore, the layered medium Seismic data exhibits anisotropic characteristics with a vertical axis of symmetry (hereinafter referred to as VTI), which directly affects the accuracy of rock formation velocity estimation and has an important impact on seismic data imaging. At the same time, oil and gas reservoirs are often accompanied by the development of fractures, and fractures also have an important impact on the mig...

Claims

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