基于Rayleigh积分的聚焦束估算层状介质的三维地震观测系统分辨率

通过对聚焦束计算过程的简化，用Rayleigh积分实现了三维层状介质的三维观测系统聚焦束的计算.(1)用目标点处激发的地表响应代替CFP道集的形成；(2)用单频谐波计算代替全频率范围的计算；(3)用插入虚拟界面的方法实现了起伏界面的Rayleigh积分波场外推.此三点改进实现了在微机上进行三维层状介质的聚焦束计算，从而估算出三维观测系统的分辨率.此项研究对于三维观测系统的优化设计具有指导作用.

Resolution of 3D seismic acquisition geometries based on the double focal beam method

With simplifying the process of calculating a double focal beam, the focal beam of 3D acquisition geometry for 3D layer model is calculated by using Rayleigh integral. There are several simplifications: (1) The response of the target point at the surface substitutes calculating CFP gather. (2) The response of the peak frequency of the wavelet substitutes the full range spectra response. (3) The wave-field extrapolation and continuation with Rayleigh integral in rough interface models is achieved by inserting virtual interfaces. These improvements make it feasible to implement the focal beam calculation of 3D layer model on a micro-computer system. So the resolution of 3D geometry could be assessed. This research could guide the optimum design of 3D geometry.