转换波合成地震记录制作及其在气云区构造研究中的应用——以渤海F油田为例  

Method for making P-SV synthetic seismogram and its application of reservoir depth prediction in gas cloud area:a case study of Bohai“F”Oilfield

作　　者：张正龙 夏同星 刘垒 龚敏 ZHANG ZhengLong;XIA TongXing;LIU Lei;GONG Min(Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《地球物理学进展》2022年第3期1352-1359,共8页Progress in Geophysics

摘　　要：由于气云区内逸散气体的存在,纵波地震资料出现构造畸变、储层成像不准等一系列问题,而转换波资料受气云影响小,成像效果较好,为在气云区内部开展构造、储层研究提供了良好的资料基础.对于转换波资料的应用,其合成地震记录的制作及其与纵波资料进行层位对比标定一直是国内外学者关注和研究的重点.本文根据前人研究思路,在Aki-Richards近似公式的基础上,细致梳理出“可操作性”更强的转换波反射系数简化公式,并对其进行了精度和适应条件的分析论证,在此基础上,提出了一套利用纵波解释模块完成转换波合成地震记录制作和标定的工作流程,使得该项工作在缺少多波解释工具的情况下也能正常、快速开展.最终,将该方法应用在渤海F油田气云区构造研究中,取得了很好的效果.The quality of P-wave seismic image in gas cloud area is negatively affected by fugitive gas.However,the quality of P-SV wave seismic image in gas cloud area is better than that of P-wave seismic image because of the small influence of fugitive gas on S-wave velocity,which provides another better seismic data for the study of structure and reservoir in gas cloud area.But,the application of P-SV wave seismic has been restricted by some problems,such as the making method of P-SV wave synthetic seismogram and the method of horizon comparison and calibration with P-wave seismic.Based on previous research,this paper deduces a more simplified calculation formula of P-SV wave reflection coefficient according to Aki-Richards approximate formula,and analyzes the accuracy and applicable conditions of the new formula through model test,which lays a solid foundation for making the P-SV wave synthetic seismogram.In addition,in the absence of multi wave interpretation tools,a set of work flow of making P-SV wave synthetic seismogram and horizon calibration using P-wave interpretation module is proposed.Finally,the application in F oilfield shows that the geological horizon calibration of P-SV wave data is well completed by this method,and the obtained P-SV wave structural map well reflects the real structural characteristics of underground in gas cloud area,which has a very important guiding significance for finding structural traps and deploying well locations in areas seriously affected by gas cloud.

关 键 词：转换波 气云区 反射系数 合成地震记录 构造 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]