【摘要】 VTI介质地震数据成像的关键问题之一是解决反问题的不适定性,特别是当正演算子的伴随算子无法对其逆算子充分逼近时,可以采用迭代偏移反演方法求取更精确的逆算子。本文研究了VTI介质地震偏移反演成像的计算方法,导出了偏移成像算子方程,并提出了固定点迭代正则化算法。该方法是一种改进的迭代正则化算法,与一般的迭代正则化方法相比,无需矩阵分解,具有更高的计算效率。本文对典型模型数据进行了数值模拟,并对实际数据进行了试验性处理,结果表明,该偏移反演成像方法在地震成像领域具有一定的应用前景。更多还原

【Abstract】 One of the key issues of seismic imaging in VTI media is to solve ill-posed inverse problems,especially when the inverse operator of a modelingoperator cannot be approximated sufficiently by its adjoint.We first discuss in this paper algorithms of migration inversion imaging,which is based on a different strategy from the conventional seismic migration,in VTI media.Then we derive an operator equation of migration,and propose the fixpoint iterative(F PI)regularization migration inversion algorithm.FPI is more computational efficient than conventionally regularization methods,because matrix decompositions are no longer needed in the algorithm.In order to verify the feasibility of our new method,we perform tests on both synthetic and field seismic data.The results show that applications of the fixpoint iteration migration inversion obtain higher data S/N ratio and higher accuracy of seismic imaging than conventional approaches.更多还原