拟层速度剖面在川中—川南过渡带油气勘探中的应用  

The application of pseudo interval velocity section to hydrocarbon exploration in the transitional zone between mid Sichuan and south Sichuan

作　　者：向鼎璞 张小平[1] 吴大奎[1] 

机构地区：[1]四川石油管理局地震资料处理解释中心

出　　处：《石油地球物理勘探》1990年第2期177-190,244,共15页Oil Geophysical Prospecting

摘　　要：川中—川南过渡带是四川盆地重要含油气远景区之一,主要储层为海相碳酸盐岩地层,其层速度与岩层背景速度比较接近。当孔隙、缝洞发育或含气时,在拟层速度剖面上,往往出现低速异常。这些低速异常在不同地层中的级差不尽一样。根据各个地层中低速异常的级差,可以帮助确定:地质层位分界面、构造侵蚀面、岩性、岩相及其变化情况;断层,裂缝发育情况;生物礁发育情况;含油气情况等。本文应用翔实的拟层速度剖面,结合钻井和其它物探资料,对川中—川南过渡带进行详细地分析。The transitional zone between mid Sichuan and south Sichuan is one of important potential hydrocarbon-bearing areas in the Sichuan basin. The dominant reservoir is marine carbonate formation,whose interval velocity is rather close to noimal velocity at its depth.Low-velocity abnormality often occurs on pseudo interval velocity section when pores, fractures and eaves are multitudinous or fill with gas.The low-velocity abnormalities in different formations usualiy differ in degree.The deg- rees of low-velocity abnormalities in different formations favour ascer- raining formation interface.erosional surface,lithology,rock facies, fault,fracture,bioherm and hydrocarbon-bearing conditions. The transitional zone between mid Sichuan and south Sichuan was carefully analysed using full and accurate pseudo interval velocity sec- tions in combination with drilling data and other geophysical data.Good results in hydrocarbon prediction have been obtained.

关 键 词：拟层速度剖面 油气预测 碳酸盐岩油气藏解释 

分 类 号：TE13[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]