基于ADCIGs的弹性波成像域走时层析成像

W. Zhonghua, Z. Kai, J. Ping, L. Zhenchun, L. Honghui, X. Wang
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摘要

与声波层析成像相比,弹性矢量波层析成像能更有效地反映弹性波在地下介质中的传播规律。s波和p波成像可以结合起来获得更准确的介质描述。传统的多分量地震资料处理存在两个问题。一是将多分量地震资料中的Z分量和X分量简单地分别处理为P波和S波,这种对不同波形的近似处理会产生强烈的错觉。其次,分别对pp波和ps波进行处理。该方法采用基于声波方程的波场分离方法获得纵波和横波分量,这对波场分离的精度有很大的依赖性。此外,标量波场的构建过程忽略了弹性波传播的矢量特征,因此基于弹性矢量波框架的多分量地震数据处理和解释迫在眉睫。
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Travel time tomography in elastic wave imaging domain based on ADCIGs
Compared with acoustic data tomography, the elastic vector wave tomography can more effectively reflect the propagation law of elastic waves in underground media. S-wave and P-wave imaging can be combined to obtain a more accurate description of the medium. There are two problems in the conventional multi-component seismic data processing. One is that the Z and X components of the multi-component seismic data are simply treated as P and S waves respectively, and this kind of approximate processing of different wave shapes will produce a strong illusion. Secondly, PP-wave and PS-wave are processed separately. In this method, P-wave and S-wave components are obtained by wave field separation based on acoustic wave equation, which strongly depends on the precision of wave field separation. In addition, the construction process of scalar wave field ignores the vector characteristics of elastic wave propagation, so it is urgent to process and interpret multi-component seismic data based on elastic vector wave framework.
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