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海底油气藏会受到气云遮蔽 ,引起纵波能量急剧衰减和发散。这时 ,用PS波成像却很有效 ,其中横波信息可降低岩性预测和流体饱和度预测的不确定性。资料处理时必须考虑介质各向异性对PS波时差和振幅的影响 ,否则会使转换点位置、CCP道集的射线轨迹和NMO速度等产生很大的误差 ,降低PS波成像的时间和空间分辨率。一个多分量各向异性处理的成功实例是用PP和PS波资料重建纯SS波反射旅行时 ,由PP和PS波的联合叠加速度层析成像得到假设的方位各向同性 (VTI)模型的层间参数 ,用P波校验炮的反射层深度信息消除参数估算的歧解 ,最后建立用于深度成像的VTI模型。
Submarine reservoirs will be sheltered by clouds of gas, causing a sharp attenuation and divergence of longitudinal wave energy. At this time, imaging with PS waves is effective, with shear-wave information reducing the uncertainty of lithologic prediction and fluid saturation prediction. The data processing must consider the effect of medium anisotropy on the time-lag and amplitude of PS wave. Otherwise, the position of the transition point, the trajectory of the CCP gather and the NMO velocity will have great errors, which will reduce the temporal and spatial resolution of the PS wave imaging rate. A successful example of a multi-component anisotropy process is to reconstruct pure SS-wave reflections from both PP and PS-wave data. A hypothetical azimuthally isotropic (VTI) model layer is derived from a combined superposition tomography of PP and PS waves In this method, the parameters of the reflection are estimated by using the reflection depth information of the P wave verification gun. Finally, a VTI model for depth imaging is established.