横波速度是进行叠前参数反演的必要条件，因此，横波速度的精度会直接影响叠前反演结果的精 度。获取横波速度信息的方法较多，但适用条件差异较大。在准确求取目的层段各岩石矿物成分的基础 上，首先利用已知的矿物弹性模量、纵横波速度区间及多种岩石物理模型来获取纵横波速度，再通过对多 个模型拟合结果的对比，优选出了适合于苏里格气田砂泥岩地层的横波速度拟合模型。实际应用结果表 明，该方法提高了合成横波速度的精度。

Shear wave velocity is the necessary condition for prestack inversion, so it can directly affect the result of prestack inversion. There are manymeans to get shear wave velocity, of which the applicable conditions deviated a lot. Based on the rock mineral composition of target zone, the elastic modulus, S-wave and P-wae velocity interval and several rock physical models were applied to obtain the S-wave and P-wae velocity. According to the comparison of model fitting results, we optimized the S-wave fitting model suitable for sand shale formation in Sulige Gas Field. The actual application result indicated that this method improved the accuracy of the simulation of shear wave velocity.