Xwfd pre-stack depth migration based on dual-complexity with error compensation correction
双复杂条件下带误差补偿的频率空间域有限差分法叠前深度偏移

Oil and gas exploration is turning to the areas with irregular topography and complex geologic structures.Prestack depth turns out to be a valid way to deal with irregular topography and complex geologic structures."wave field downward continuation" and "wave field upward continuation" are valid way to solve the problem of irregular surface migration.xwfd pre-stack migration based on wave equation has strong adaptability to the medium which has strong variable transverse velocity and it can be used for migration with dual-complexity.However the error arise from xwfd equation affect the quality of dual-complexity migration.We use the xwfd prestack migration with error compensation to improve the migration quality of dual-complexity.Numerical tests in theoretical model and actual data have been done and get better result.The error compensation can be done among several steps.We can find from the analysis that comparing to the ffd depth migration based on irregular surface,it has both advantages in migration quality and efficiency.