任意广角方程逆时偏移的脉冲响应及模型试算

采用高阶差分法求解任意广角声波方程,推导了各向同性介质中任意广角声波方程叠前逆时深度偏移的差分算子,给出了适用于任意广角声波方程逆时延拓的吸收边界条件和其计算方法,在此基础上实现了任意广角声波方程的高精度逆时延拓。分析了不同模型条件下任意广角声波方程叠前逆时深度偏移的脉冲响应,分析结果表明,任意广角方程逆时偏移算子可压制层间反射波,减少偏移噪声,理论模型的成像结果表明该方法能够对复杂构造模型精确成像。

Arbitrary Wide-angle Wave Equations Reverse-time Migration Impulse Response and Model Test

Using high order difference method to solve arbitrary wide-angle acoustic wave equations （AWWE）, deduced difference oper- ators of AWWE prestack reverse-time depth migration in isotropic medium, has derived absorbing boundary conditions adequate for AWWE reverse-time continuation and computation method, and realized high accuracy reverse-time continuation. Analyzed prestack reverse-time depth migration impulse response under different model conditions, the result has shown that the AWWE reverse-time migration operators can suppress the interlayer reflection waves, reduce migration noises, the theoretical model imaging result has shown that the method can preciselv imaging the complex structural models.