论文部分内容阅读
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 method used in seismic exploration and development. Aiming at the problem of angle coverage in traditional walk-back tomography, the tomographic imaging is solved by using regularization constraints. The accuracy of the experimental model is judged by the pickup fitting of gathers. No longer use the original shot record residual time difference, the use of depth residuals and travel time residuals linear relationship to improve the travel time residuals picking accuracy. The experimental results show that this method can reflect the updated migration velocity field well and obtain more accurate migration imaging results, which can be finely portrayed for small scale geological structures.