时间域剩余曲率偏移速度分析技术在iCluster软件中的实现

Realization of time-domain residual curvature migration velocity analysis in iCluster software platform

共成像点道集的剩余曲率偏移速度分析(RCA)是提高偏移速度精度的有效方法之一。通过分析推导Kirchhoff叠前时间偏移共成像点道集的剩余曲率与偏移速度的关系,基于iCluster地震数据处理研发平台,开发了剩余曲率分析法偏移速度分析模块。通过模型数据和实际数据的测试,该模块能够与Kirchhoff叠前时间偏移有机结合,可以对均方根速度场进行局部、定量的修正,完善了iCluster软件Kirchhoff叠前时间偏移的流程。

Residual curvature analysis(RCA)based on common imaging point gathers is one of the effective methods in improving the accuracy of migration velocity.By analyzing the relationship between the residual curvature of Kirchhoff PSTM common imaging point gathers and migration velocity,we developed a PSTM velocity analysis module on iCluster seismic data processing platform.We tested the module with model data and real data.All the tests show that this module can adjust the RMS velocity field locally and quantificationally,and can work well with Kirchhoff prestack time migration.