叠前深度偏移层析反演速度模型建立及应用

MODELING OF THE TOMOGRAPHIC INVERSION VELOCITY FOR PRESTACK DEPTH MIGRATION AND ITS APPLICATION

叠前深度偏移技术是目前解决复杂地质构造精确成像问题的重要手段，其成像效果取决于深度域速度模型的准确与否。通常采用的沿层构造解释速度建模方法在构造特别复杂、层位解释不合理时往往得不到准确的速度模型，因此研究了层析反演更新深度域速度模型的建立方法。该方法可利用偏移成像数据计算剩余误差曲线和地层倾角信息，迭代更新反射层的位置和形态，最终获取准确的速度模型。应用实例表明，层析反演速度建模技术是可行的。

The technique of prestack depth migration is the main measure to resolve the high-precision imaging problem of complicated geological structures at present, the imaging effects are determined by the accuracy or not of the velocity model in the depth domain. Usually the accurate velocity model is not obtained by the modeling method of interpreting the velocities along the stratigraphic structures at the times of extra complicated structures and non- reason horizon interpretation, therefore the modeling method of refreshing the velocity in the depth domain by tomo- graphic inversion is developed. The method can make use of the migration imaging data to calculate the informations of the residual error curve and stratigraphic dip, iterate and refresh the location and configuration of the reflecting horizons, and finally obtain the accurate velocity model. The case history shows that the modeling technique by to- mographic inversion velocity is feasible.