用3CVSP资料分析含煤地层的方位各向异性
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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 VSPCDP 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.
引文
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