井间地震纵横波分离方法研究及应用
网络出版日期: 2013-09-26
基金资助
国家高技术研究发展计划“863”项目“陆上非一致性时延地震、微地震油藏监测方法研究”(编号:2011AA060303)资助
Study on P and S wave separation method in cross-well seismic and its application
Online published: 2013-09-26
以VSP 和井间地震勘探为主的井孔地震资料采集需采用三分量地震采集技术,该技术能够记录下 信息丰富的地震波场,但是纵波波场和横波波场耦合在一起,成为多分量地震资料处理的重点和难点。通 过对井孔地震资料采集观测系统的分析和研究,结合纵波波场和横波波场在不同分量上的关系,可以得 到纵波和横波的极性与视速度,以及地震波到达检波器接收排列方向之间的关系。据此在基于Cauchy 分布的高分辨率Radon 变换的基础上,得到纵波波场和横波波场的分布关系,并在τ(截距时间)-p(视慢 度或斜率)域中利用极化滤波方法,实现纵波波场与横波波场的有效分离。通过正演模拟数据试算和实 际井间地震资料处理效果分析,认为该方法能够有效地分离纵波波场和横波波场,为后续纵横波的独立 成像奠定了基础。
杨杰 . 井间地震纵横波分离方法研究及应用[J]. 岩性油气藏, 2013 , 25(5) : 94 -99 . DOI: 10.3969/j.issn.1673-8926.2013.05.017
Three-component seismic acquisition technology used in VSP and cross-well seismic can record wealthy seismic wave field. The P and S wave couple together, which becomes the difficulty and emphasis of data processing. Through analyzing borehole seismic acquisition system, combined with polarity relation of P and S wave in different components, we can associate polarity of P and S wave with apparent velocity and direction of seismic wave reaching the geophone array. According to this relation, we obtained the distribution relation of P and S wave in τ- p domain based on the linear Radon transform (LRT). Considering the convergence of LRT, we designed a polarization filteringmethod using the high-resolution Radon transform, and then accomplished the separation of P and S wave. The processing of
simulated data of theoretical model and practical cross-well model separated P and S wave field successfully, which is useful for independent imaging of P and Swave.
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