基于AVO反演的溶蚀孔洞型碳酸盐岩储层预测  

Caved carbonate reservoir prediction based on AVO inversion

作　　者：张远银 孙赞东 唐志远 李颖薇 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室地质地球物理综合研究中心,北京102249 [2]中海油深圳分公司研究院,广东广州510240

出　　处：《石油地球物理勘探》2013年第1期109-113,120,共6页Oil Geophysical Prospecting

基　　金：国家重点基础研究计划"973"项目"中国西部叠合盆地深部有效碳酸盐岩储层形成机制与分布预测"(2011CB201103);国家油气重大专项"海相碳酸盐岩储层地震描述与油气藏有效预测技术研究"(2011ZX05004003)联合资助

摘　　要：在塔里木盆地溶蚀孔洞型碳酸盐岩储层预测中,基于叠后资料以"串珠状"强反射为目标的传统手段难以弄清溶洞内充填状况,也无法识别不具"串珠状"反射特征的"内幕低阻抗"储层。本文以塔中45、中古21和轮古34三个井区为例,基于地震资料保幅处理和岩石物理分析,应用AVO反演预测了溶蚀孔洞型碳酸盐岩储层。相比传统叠后方法,AVO反演不仅能够分辨溶洞储层,而且能进一步判断其内部充填情况。此外,AVO反演还能识别不具"串珠状"强反射特征的"内幕低阻抗"储层。统计表明,AVO反演预测的结果与实际三个井区内全部33口井的吻合程度达91.3%。Conventional methods are used for caved carbonate reservoir prediction on bead-like strong reflections of post-stack section in the Tarim Basin.However,the filling substances of caves cannot be distinguished,and the internal weak impedance reservoir without bead-like reflection is also neglected using these conventional methods.Based on seismic amplitude-preserved processing and rock physics analysis,pre-stack inversion is employed in this paper for caved carbonate reservoir prediction in Wells TZ45,ZG21and LG34zones.Comparing with conventional post-stack methods,AVO inversion can not only distinguish resolvable dissolution caves,but also predict the filling substances.Moreover,it can characterize the distribution of internal weak impedance reservoir without bead-like reflection.In practice,the coincidence of AVO inversion prediction with the drilling results of 33 wells in the zones is up to 91.3%.

关 键 词：AVO反演 碳酸盐岩 溶蚀孔洞 内幕低阻抗 

分 类 号：P631[天文地球—地质矿产勘探]