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传统叠前深度偏移只能够提供地下的构造信息,但工业界在需要构造信息的同时还要与地下界面反射系数成比例的振幅信息。最近几年,基于单程波方程的保幅叠前深度偏移算法有了一定的发展,但是,基于炮域、单程波的保幅型叠前深度偏移必须应用反褶积型的成像条件,这种成像条件在构造复杂、速度变化剧烈的地区会出现不稳定现象。基于角度域的保幅深度偏移克服了这一不稳定性缺点的同时,还域的保幅深度偏移,模型和实际资料的试算分析验证该思路方法的正确性和有效性。
Traditional prestack depth migration can only provide subsurface structural information, but industry needs amplitude information that is proportional to the reflection coefficient of the subsurface interface when it is needed to construct the information. In recent years, the prestack depth migration algorithm based on the one-way wave equation has been developed. However, the defocus-type imaging conditions must be applied to the amplitude-preserving prestack depth migration of the one-way wave based on the gun field. This imaging conditions in the complex structure, speed changes in the region will appear instability. The preserving depth migration based on the angle domain overcomes the shortcoming of this instability, meanwhile preserves the depth migration of the domain, and validates the correctness and validity of the method by trial calculation of the model and the actual data.