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Method for acquiring azimuth velocity of seismic converted wave and method for processing seismic data

A seismic data and azimuth velocity technology, applied in the field of petroleum geophysical exploration, can solve the problem that seismic converted waves cannot well eliminate the azimuth time difference of wide azimuth converted waves

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

[0007] Since the existing method for determining the azimuth velocity of the seismic converted wave cannot well eliminate the azimuth moveout of the wide-azimuth converted wave, the present invention provides a method for obtaining the azimuth velocity of the seismic converted wave and a method based on the obtained A Method of Processing Seismic Converted Wave Data Using Azimuth Velocity

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  • Method for acquiring azimuth velocity of seismic converted wave and method for processing seismic data
  • Method for acquiring azimuth velocity of seismic converted wave and method for processing seismic data

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[0014] Anisotropy in rocks is usually caused by a group of oriented vertical fractures, so according to the theory of seismic wave propagation, converted waves have different travel velocities when traveling parallel or perpendicular to the fractures. When propagating parallel to the fracture, it propagates at a fast wave velocity; when propagating perpendicular to the fracture, it propagates at a slow wave velocity.

[0015] According to the characteristics of the above-mentioned velocity and azimuth anisotropy, the present invention adopts the least squares fitting method to obtain the expression of the velocity and azimuth anisotropy ellipse solution, and applies the anisotropic velocity to the processing of omnidirectional data to eliminate the distortion of omnidirectional data. The time difference of different azimuth data in the same gather can completely level the events of the same layer, improve the resolution of the stacked section, improve the imaging quality of the...

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Abstract

The invention provides a method for acquiring the azimuth velocity of a seismic P-SV converted wave and a method for processing the data of the seismic converted wave according to the acquired azimuth velocity. The method for acquiring the azimuth velocity of the seismic P-SV converted wave comprises the following steps: in the asymptotic common conversion point (ACCP) gather of wide azimuth converted wave seismic data, the ACCP gather is divided into a plurality of azimuth sectors based on the difference between azimuth angles, and the seismic data in each azimuth sector comprises a plurality of channels in the ACCP gather; on the basis of the seismic data of the plurality of channels in each azimuth sector, the velocity of the azimuth sector is determined; ellipse fitting is performed on the velocity of each azimuth sector; and the azimuth velocity of each azimuth is determined based on the fitted ellipse, and the velocity is applied to the normal-moveout correction of each azimuth seismic data and other processes.

Description

technical field [0001] The present invention relates to petroleum geophysical exploration technology, in particular to a method for obtaining the azimuth velocity of seismic P-SV converted wave, and a method for processing seismic converted wave data according to the obtained azimuth velocity. Background technique [0002] Petroleum exploration practice shows that the world's fractured oil and gas reservoirs account for more than half of the total oil and natural gas reserves, and fractures, especially high-angle (vertical) open fractures, are a necessary condition for high oil and natural gas production. The existence of fractures enhances the anisotropy characteristics of the medium. Studies have shown that it is very common for formation anisotropy caused by fractures to be 10%, and the maximum can even reach more than 25%. In order to effectively identify these cracks, the current AVAZ (amplitude varies with azimuth), VVAZ (velocity varies with azimuth), AVOAZ (AVO respo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 唐建明马昭军徐向荣甘其刚徐天吉康利徐美娟马如辉
Owner CHINA PETROLEUM & CHEM CORP
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