用3CVSP资料分析含煤地层的方位各向异性  

Analysis of azimuthal anisotropy in coal measures by 3CVSP data

作　　者：石瑛[1] 王赟[1] 芦俊[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《煤炭学报》2007年第8期813-817,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)基金资助项目(2006CB202207)

摘　　要：提出用横波分裂现象检测含煤地层中瓦斯的富集部位,用三分量VSP直接在薄煤层附近观测其方位各向异性信息,通过3次坐标旋转变换,对三分量矢量波场数据进行分离,用质点振动图法计算偏振角.对分离后的快、慢波进行VSP-CDP成像,计算各向异性系数与裂隙密度,并通过实例验证了该方法的可行性.Shear wave splitting was used to detect the gas area in coal measures. Three-component vertical seismic profile was utilized to acquire the azimuthal anisotropic data near the thin coal measures. Through three coordinate transformation, three-component seismic vector wavefields were separated, and polarization angles were calculated by particle vibration curve. After VSP-CDP mapping of the fast and slow shear waves, the anisotropy parameters and the fracture densities were derived. An application example was presented to validate the feasibility of this method.

关 键 词：方位各向异性 横波分裂 三分量垂直地震剖面 裂隙 

分 类 号：P315.3[天文地球—地震学]