西湖凹陷K气田地震储层预测中去除煤层影响技术及其应用  

Research and application of coal seam interference trimming in seismic reservoir prediction of K Gas Field in Xihu Sag

作　　者：袁悦 李帅 姜雪 YUAN Yue;LI Shuai;JIANG Xue(Shanghai Branch of CNOOC(China)Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《海洋地质前沿》2024年第4期71-82,共12页Marine Geology Frontiers

基　　金：“十四五”国家重大科技项目海上深层/超深层油气勘探技术课题“弧后盆地深层/超深层油气成藏条件与成藏机制研究-西湖凹陷”(KJGG2022-0402)。

摘　　要：煤层引起的强反射对地震信号有极强的干涉作用。东海陆架盆地西湖凹陷K气田煤层发育,且具有“横向上连续性差、分布零散,纵向上期次多、厚度薄”的特点。研究发现,煤层的存在会导致该区砂体预测存在无中生有、地震反射结构被屏蔽等问题,严重制约了地震储层预测的精度,因此,应用地球物理半定量解释定位煤层、地震高幅滤波过滤煤层、多子波分解重构置换煤层等方法,在尽量多保留有效地震反射信息的基础上去除K气田煤层强反射对地震信号的影响。消除煤层强反射后的地震数据与储层相关性更高,提升了储层预测精度和可靠性。The strong reflection caused by coal seam has strong interference effect on seismic signal.The K Gas Field in Xihu Sag of the East China Sea Shelf Basin features poor continuity,scattered distribution,and thin thickness.In this study,we found that the presence of coal seams could lead to problems in sand body prediction,such as creating something out of nothing and shielding of seismic reflection structures,which severely limited the accuracy of seismic reservoir prediction.Therefore,by using semi-quantitative interpretation of geophysical responses to locate coal seams,seismic high-amplitude filtering to filter coal seams,and multi-wavelet decomposition and reconstruction to replace coal seams,the influence of strong reflection from coal seam in K Gas Field on seismic signal was removed while retaining as much effective seismic reflection information as possible.After eliminating strong reflection of coal seams,the correlation between seismic data and reservoir became higher,and the accuracy and reliability of reservoir prediction were improved.

关 键 词：西湖凹陷 煤层 高幅滤波 多子波分解重构 

分 类 号：P744.4[天文地球—海洋科学]