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本文主要根据各单层模型的叠加速度调查了这些模型反射时距曲线的特征。这些模型基本上有三种不同的类型:一维层状层,二维分层水平倾斜层,二维均匀弯曲层。通过数值试验说明,如果忽略了分层的影响,则高分层介质会使层的厚度估算出现很大的误差。而当介质趋于椭圆各向异性介质时,则误差可以部分减少。对于均匀且弯曲层的情况,随着反射分界面的曲率和垂直入射点局部分界面的倾角增加,常规叠加速度分析所给的速度偏差增加。如果这个偏差不被校正,则一般的 Dix 速度估算技术会导致深度估算出现很大的误差。
In this paper, the characteristics of the reflection time-distance curve of these models are mainly investigated according to the superposition speed of each single-layer model. There are basically three different types of these models: one-dimensional laminar layers, two-dimensional stratified horizontal slant layers and two-dimensional uniform curved layers. Numerical experiments show that if the influence of delamination is neglected, the high delamination medium will make a big error in the estimation of layer thickness. When the medium tends to an elliptical anisotropic medium, the error can be partially reduced. In the case of a uniform and curved layer, the velocity deviation given by conventional stacking velocity analysis increases as the curvature of the reflecting interface and the inclination of the local interface at the vertical incidence point increase. If this deviation is not corrected, the average Dix speed estimation technique can lead to significant errors in the depth estimation.