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

Active Publication Date: 2020-12-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] This method has the following problems: 1. It needs a lot of manpower, because the data of each sector needs to be analyzed manually; 2. The artificial picking speed will inevitably bring picking errors, which will affect the final simulation. 3. In general, the azimuth distribution of seismic data is irregular. After sectorization, the coverage times of some sectors are very low, resulting in insufficient accuracy of velocity analysis in these sectors, which affects the final fitting. Results; 4. The traditio

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  • Method and system for orthogonal anisotropy velocity inversion
  • Method and system for orthogonal anisotropy velocity inversion
  • Method and system for orthogonal anisotropy velocity inversion

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[0037]The principle and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are only provided to enable those skilled in the art to better understand and then implement the present invention, but not to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0038]Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, device, method, or computer program product. Therefore, the present disclosure may be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0039]According to the embodiments of the presen...

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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.

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...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6222Y02A90/30
Inventor 耿伟峰王文闯孙鹏远邱宁王宏梁琰
Owner BC P INC CHINA NAT PETROLEUM CORP
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