学术
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．[著者文摘]
文章出处:
《煤炭学报》-2007年32卷8期 -813-817页
分 类 号:
文献标识码:
A
文章编号:
0253-9993（2007）08-0813-05
Analysis of azimuthal anisotropy in coal measures by 3 CVSP data
SHI Ying, WANG Yun, LU Jun （Institute of Geology and Geophysics, China Academy of Science, Beifing 100029, China）
Abstract:
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.[著者文摘]
Key words:
azimuthal anisotropy ; shear wave splitting ; 3 CVSP; fracture
基金资助:
国家重点基础研究发展计划（973）基金资助项目（2006CB02207）
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