The reflection of fast P-wave is most sensitive to the porosity variations, less sensitive to the saturation variations and least sensitive to the permeability and frequency variations.
快P波反射对孔隙度的变化敏感，饱和度次之，对渗透率和频率的变化不敏感。
Then the azimuth of formation fractures is estimated; and with the joint use of zero offset P wave source VSP data, fast and slow shear wave seismograms are obtained to have fracture density.
在获得地下裂隙方位角的同时，结合零偏纵波VSP资料得到快、慢S波记录，进而计算了裂隙密度。
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