另一方面，对裂隙单元进行三角形单元的有限元网格划分，运用变分原理导出裂隙单元的渗流有限元求解方程。
On the other hand, the fracture elements are discretized into triangular mesh, and the flow finite element equations are derived based on the variational principle.
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。
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.
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