Anisotropic Amplitude Change of Converted Waves with Incidence Angle Gather Extraction Method
An anisotropic and incident angle technology, which is applied in the field of gather extraction where the anisotropic amplitude of the converted wave changes with the incident angle, which can solve the problems of poor accuracy and achieve the effect of good accuracy.
Active Publication Date: 2017-03-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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[0004] The main purpose of the present invention is to provide a method for extracting converted-wave anisotropic AVA gathers to solve the problem of poor precision in the extraction methods of multi-wave AVA gathers existing in the prior art
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[0024] The main idea of the present invention is that, based on the principle of scattering, the migration velocity of P-wave and S-wave is used to extract CSP gathers in the depth domain, and the migration velocity and anisotropy parameters are updated based on the residual curvature analysis method, and according to the converted imaging depth Realize the horizon matching between PP wave and PS wave; convert the P wave and S wave migration velocity and anisotropy parameters obtained from the depth domain analysis to the PP wave T0 time domain, and use prestack migration and anisotropic ray tracing The method obtains PP wave and PS wave AVA gathers with completely matching horizons, so that the accuracy of AVA gather extraction method is better.
[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific emb...
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The embodiment of the invention provides a converted wave anisotropy amplitude various angle (AVA) gather extracting method. The converted wave anisotropy amplitude various angle gather extracting method comprises the steps that amplitude preserving preprocessing is carried out on PP waves; a depth domain offset grid is set, first offset distance data are selected according to the algorithm, and a depth domain CIG gather of the PP waves is obtained through P wave constant velocity deviation; an r spectrum of the CIG gather is calculated, and the P wave root-mean-square velocity is obtained; the P wave constant velocity is replaced with the P wave root-mean-square velocity, and iteration is carried out on the steps until the peak point of the r spectrum is completely converged to be zero; second offset distance data are selected, and a depth domain CIG gather of the PP waves is obtained through the P wave constant velocity deviation; a g spectrum of the CIG gather is calculated, and anisotropy parameters of the PP waves are obtained; a depth-time corresponding relation is calculated, and the updated P wave root-mean-square velocity and the updated P wave anisotropy parameters are converted to be in the time domain; a converted wave gather of the PP waves is extracted. The method solves the problem that a multi-wave AVA gather extracting method is poor in precision.
Description
technical field [0001] The invention relates to the technical field of seismic waves, in particular to a method for extracting a gather of converted wave anisotropy amplitude changing with incident angle. Background technique [0002] For PS wave anisotropy, there are often multiple sets of sedimentary strata above the reservoir, and the heterogeneity of the strata leads to anisotropy in the velocity of seismic waves, so the amplitude of PS wave anisotropy varies with the incident angle (AmplitudeVarious Angle, AVA) gathers need to eliminate the anisotropy of seismic wave propagation travel time in the overlying formation, so as to obtain a large array of multi-wave AVA gathers with better dynamic correction. [0003] However, the traditional multi-wave AVA gather extraction method usually uses the Common Middle Point (CMP) gather of PP wave and the Common Conversion Point (CCP) gather of PS wave based on the isotropic velocity spectrum. AVA gather conversion, and then comp...
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IPC IPC(8): G01V1/28G01V1/30
Inventor 芦俊石瑛王赟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)