井间地震广角反射波形校正技术研究与应用  

Research and application of wide-angle reflection waveform reshaping in crosswell seismic

作　　者：魏国华[1] 林松辉[1] 孔庆丰[1] 左建军[1] 李九生[1] 

机构地区：[1]中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022

出　　处：《石油物探》2011年第2期206-212,12,共7页Geophysical Prospecting For Petroleum

基　　金：国家高技术研究发展计划(863)项目(2007AA060503)资助

摘　　要：井间地震采集中接收到的反射波以大角度反射为主,而广角反射易产生波形畸变,在井间CDP角度道集上表现为反射波同相轴发生扭曲、波形变宽。为了消除广角反射对叠加成像的影响,需要对广角反射进行波形校正。通常通过校正反射同相轴的相位和振幅使反射同相轴的波形趋于一致,其校正方法主要包括相位校正、振幅校正和子波整形反褶积等方法。相比之下,子波整形反褶积方法是一种更为快速、适用的井间地震角度道集波形校正方法,它无需对同相轴进行相位扫描,而是直接设计一种子波整形滤波器,把没有畸变的地震道作为期望输出,对发生畸变的地震道进行整形反褶积,同时实现了反射同相轴的相位与振幅的校正,从而消除广角反射波形畸变的影响。Wide-angle reflection is widespread in crosswell seismic data acquisition,while it is easy to produce waveform distortion such as distorted event and fat waveform in the CDP angle gather.In order to eliminate the wide-angle effect on the stack imaging,waveform correction of wide-angle reflection should be carried out.We usually carry out the correction of phase and amplitude of reflection event to make its waveform keep consistent,including phase correction, amplitude correction and wavelet shaping deconvolution method.In contrast,wavelet shaping deconvolution method is more suitable for angle gather waveform correction of crosswell seismic,which does not need event scanning,but directly designs a wavelet shaping filter to make the wavelet without distortion as the desired output, then perform shaping deconvolution on the wavelet with distortion, meanwhile,achieve phase and amplitude correction of reflection event. as well as eliminate the impact of wide-angle reflection.

关 键 词：井间地震 广角反射 角度道集 临界角 波形校正 

分 类 号：P631.4[天文地球—地质矿产勘探]