Azimuth Anisotropy Prediction and Correction of Wide-Azimuth Seismic

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Interpretation-A Journal of Subsurface Characterization Pub Date : 2023-07-20 DOI:10.1190/int-2022-0112.1
Liyan Zhang, Ang Li, Xi Nianxu
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Abstract

For seismic wave propagation in HTI media, both kinematic and dynamic attributes are anisotropic. P-waves run slower in the direction perpendicular to fracture azimuth than in the direction parallel to fracture azimuth; meanwhile, reflection strength and frequency vary with azimuth. We quantitatively analyzed azimuthal effects of reflection coefficients and velocities of seismic waves in HTI medium. The anisotropy on the azimuth gathers from theory and real wide-azimuth data was studied as well. Therefore, ellipse fitting was performed to quantitatively predict the direction and strength of the anisotropy in the study area, which was consistent with that obtained by the shear wave splitting prediction method. In wide azimuth data processing, in order to eliminate the influence of azimuthal anisotropy, the coherent spectrum pickup method was utilized to accurately calculate the azimuthal velocity of underground HTI media, and conducts azimuthal anisotropy correction processing, which eliminates the fast and slow wave time difference caused by azimuthal anisotropy, and achieves good results, providing a support for subsequent high-resolution imaging.
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宽方位地震的方位各向异性预测与校正
对于地震波在HTI介质中的传播,运动学和动力学属性都是各向异性的。P波在垂直于裂缝方位角的方向上比在平行于裂缝方位的方向上传播得慢;同时,反射强度和频率随方位角的变化而变化。定量分析了HTI介质中地震波反射系数和速度的方位角效应。从理论和实际宽方位角数据两个方面研究了方位道集的各向异性。因此,进行了椭圆拟合来定量预测研究区各向异性的方向和强度,这与剪切波分裂预测方法获得的结果一致。在宽方位数据处理中,为了消除方位各向异性的影响,利用相干谱拾取方法准确计算地下HTI介质的方位速度,并进行方位各向异性校正处理,消除了方位各向异性引起的快、慢波时差,取得了良好的效果,为随后的高分辨率成像提供支持。
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
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