基于射线追踪的成像域走时层析反演及其应用

Traveltime Tomography in Imaging Domain and Application Based on Raytracing

层析成像是现今地震勘探开发处理中的常用手段,针对传统走时层析反演中角度覆盖问题,利用正则化约束加以解决,利用角道集的拾取拟合来判断实验模型的准确性,同时,不再利用原始炮记录拾取剩余时差,利用深度残差与走时残差的线性关系提高走时残差的拾取精度。以三层洼陷模型和实际资料进行试算,结果表明:本方法可以较好地反演更新偏移速度场,得到更精确的偏移成像结果,对于小尺度地质构造可以精细刻画。

Tomography is a common means of modern seismic exploration and development process, according to the traditional view of traveltime tomography inversion with the coverage problem, using the regularization constraint to solve the judgment accuracy, judging the experimental model by using pick fitting angle gather, at the same time, no longer use the original shot records to pick up the residual move out, improving the accuracy of picking travel time residuals by using linear of depth the residuals and travel time residuals. With three layers in the model and real data inversion results show that： the method can update the migration velocity field better, get the migration results more accurate, and describe the construction of small scale geologic.