【摘要】 页岩气储集层具有高自然伽马、低声波速度、低密度、高电阻率等地球物理特性,这些特性都可以作为页岩气储集层识别的依据。但由于其有效孔隙度较低,成藏主要受控于裂缝发育程度,页岩气的地球物理勘探主要是通过检测页岩裂缝的发育程度及方向来确定页岩储集层的有利发育区带。讨论了利用因岩性各向异性而产生的地震波的各向异性、快慢横波分裂、曲率相干属性、频变AVO等几种裂缝检测识别页岩气储集层的方法,为页岩气的地球物理勘探提供了思路。更多还原

【Abstract】 Shale gas is the focal point of the new energy strategy in China.China’s shale gas exploration and development are just starting,and little research on such a reservoir’s geophysical features and prospecting methods is available.The shale gas reservoir is normally of features of high gamma ray,low sonic velocity,low density and high resistivity,etc.,by which the reservoir can be identified.However,because of its low porosity,and gas accumulation is mainly controlled by the degree of fractures,the geophysical prospecting of shale gas is based on detecting the development level and direction of shale fractures to determine the favorable zones of shale reservoirs.This article presents the fracture-detecting and identifying methods,such as anisotropy,shear wave splitting,curvature and coherent attribute,frequency-dependent AVO,etc.,so that they can be as guidelines for geophysical prospecting of shale gas.更多还原