Static corrections for low S/N ratio converted-wave seismic data

摘要

abstract_textpConverted waves have slow velocity and low signal-to-noise ratio. It is also difficult to pick first-breaks and bin the common-conversion-points (CCP). Some statics methods, which work well for P-wave data, can't be effectively used for solving converted-wave statics problems. This has become the main obstacle to breakthroughs in converted-wave data processing. To improve converted-wave static corrections, first, a statics method based on the common-receiver-point (CRP) stack is used for the initial receiver static correction to enhance the coherency of the CRP stack. Second, a stack-power-maximization static correction which improves the continuity of the CCP stack is used for detailed receiver statics. Finally, a non-surface-consistent residual moveout correction of the CCP gathers is used to enhance the stack power of reflection signals from different depths. Converted-wave statics are solved by the joint use of the three correction methods./p/abstract_text