优势道叠加技术在岩性油气藏识别中的应用  

Application of advantage trace stacking technique for lithologic reservoirs prospecting

作　　者：张毅[1,2] 毛宁波 何丽娟[2] ZHANG Yi;MAO Ning-Bo;HE Li-Juan(Key Laboratary of Exploration Technology for Oil and Gas Resources,Yangtze University,Wuhan 430100 China;Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《物探与化探》2020年第3期499-506,共8页Geophysical and Geochemical Exploration

基　　金：“十三五”国家重大专项“南海西部海域低渗油藏勘探开发关键技术”(2016ZX05024-006)。

摘　　要：WZA-7N构造位于多个物源交汇区,是岩性油藏发育的有利区带,由于受地震资料分辨率的制约,常规的地震资料无法准确地刻画岩性边界,不仅增加了勘探风险,还影响了储量计算结果的可靠性。针对这一勘探难题,根据叠前道集中不同地震道分辨率、成像质量以及反应地质特征的差异性,结合井上合成记录与VSP走廊叠加道上的波组特征,设计了一套优势地震道叠加的技术流程,提高了地震分辨率,重新落实了岩性边界。实践证实,新的岩性解释方案与现有钻井资料吻合较好,进一步表明了优势道叠加技术能够有效提高地震分辨率和岩性边界解释精度,是适合该区岩性油藏精细勘探的实用技术。WZA-7N structure is located in the intersection area of multiple provenances,which is generally the prospective zone of development of lithological reservoir.Due to the limitation of seismic resolution,conventional seismic data cannot accurately describe lithological boundaries,not only increase the exploration risk,but also affect the reliability of reserve calculation.in face of this exploration problem,according to the difference of every seismic trace in one prestack gather,resolution in every prestack gather in aspect of seismic resolution imaging quality and geological characteristics reaction,combined with the seismic wave group characteristics of well synthetic seismogram and VSP corridor stacking traces,author designed a set of technical process for advantage seismic tace stacking,which can effectively improve seismic resolution and interpreted lithological boundaries again.The subsequent drilling confirmed the correctness of the new lithological interpretation scheme.Practice further shows that the advantage tace stacking technique can effectively improve seismic resolution and interpretation accuracy of lithological boundary,which is a practical technique suitable for fine exploration of lithological reservoirs in weizhouA-7N structure.

关 键 词：叠前道集 VSP走廊叠加道 优势道叠加 地震分辨率 岩性边界 

分 类 号：P631.4[天文地球—地质矿产勘探]