利用斯通利波信息进行裂缝评价

声波全波列波形中的伪瑞利波、斯通利波等后续波与地层性质有密切关系，特别是反映斯通利波对裂缝及其渗透性较为敏感。通过低通滤波、中值滤波、二维频率滤波等处理对全波列进行波场分离，可分别得到直达斯通利波、上行和下行的反射斯通利波，并由此计算出斯通利波的透射和反射系数。根据这些参数能很好地确定缝的位置，评价裂缝带的渗透性。

Application of Stonley Waves to Fracture Evaluation.

The later waves on the acoustic full wavetrains, such as pesudo Rayleigh wave and Stoneley waves, have close relationship with formation properties. The reflected Stoneley wave is especially sensitive to fracture characters. By using low pass digital filter, middle value filter and 2D FFT, the wave field of full waveform logging data can be separated, and the direct Stoneley wave, the up and down reflected Stoneley wave sections can be obtained. Then the reflected ratio of Stoneley waves is calculated and used to determine the location of fracture and evaluate the permeability of fracture zone.