保幅炮域高斯波束偏移

摘要

The inverse wavefield extrapolation formula in terms of Gaussian beam was derived, and combined with deconvoluation imaging conditions, a 2-D preserved amplitude shot domain Gaussian beam migration formula was obtained. During the realization of this migration method, the method of steepest descent is needed to reduce the two dimensional complex integral to one dimensional. The computation procedure of shot domain Gaussian beam migration was given. Finally, the proposed method was tested on horizontal layer model and Marmousi model respectively. The exactness and effectiveness of this migration method was validated by the results.%推导基于高斯波束表示的波场反向延拓公式,并结合反褶积成像条件得到保幅的二维炮域高斯波束偏移公式.在高斯波束偏移方法的实现过程中,须通过最速下降法将偏移公式中的二维复值积分简化为一维以提高计算效率.给出炮域高斯波束偏移的具体计算流程.最后,分别对水平层状模型和Marmousi模型进行试算.模型试算结果验证了所提偏移方法的正确性和有效性.