基于地震横波分裂理论的火成岩裂缝检测  

The detection of fracture in igneous-rock-reservoir based on s-wave splitting

作　　者：滕佃波[1] 邢春颖[2] 王赟[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质大学能源学院,北京100083

出　　处：《地球物理学进展》2005年第2期513-517,共5页Progress in Geophysics

基　　金：中国石油化工股份有限公司"地震各向异性在油气田勘探中的应用"项目(P02075)资助.

摘　　要：定向地下裂缝是低渗透率油气藏油气的储集空间和运移通道,对油气的开采有着重要的意义.本文基于横波分裂理论,提出了比值法叠后快、慢横波分离方法,通过分离后的快、慢横波的振幅差异和时间延迟可求取地下介质的裂缝走向方位和密度以及各向异性系数.该方法被应用到松辽盆地某气田对火成岩储层裂缝走向方位和密度进行了检测,检测结果与区域应力场和实钻数据具有较好的一致性.The aligned fractures are the primary spaces and transportation channels of hydrocarbon in low-permeable reservoir, the detection of which is the key to the exploration and development of hydrocarbon. In this article, based on shear splitting theory, a new method called Ratio Method is pointed out, through which the slow and fast shear waves can be separated. Then the orientation and density of fractures as well as anisotropy of subsurface strata can be calculated through amplitude difference and time delay between fast and slow shear waves. The method is applied in the northern Songliao basin to detect the orientation and density of fractures, as well as to calculate the anisotropy cofficient in an igneous rock reservoir. The calculated results comply well with the regional stress and actual drilling data.

关 键 词：横波分裂 快慢横波分离 裂缝检测 各向异性系数 火成岩裂缝 

分 类 号：P631[天文地球—地质矿产勘探] P315[天文地球—地质学]