摘要
The authors only rely on those messages of zero-offset travel time and nonzero-offset to estimate P-wave stacking velocity in oil seismic exploration.By analogy with that,for PS-wave seismic data,we derive in this paper a new time-distance equation of PS-wave based on the equivalent medium concept,which just includes the PS-wave stacking velocity and P-wave stacking velocity within the new equation.Thereby the processing of PS-wave data can be gotten simple.At the same time,we derive a velocity ratio equation.Then we can quickly analyze the velocity ratio based on the equation so that the initial velocity ratio parameter can be provided to extract a common-conversion-point(CCP) gather data.These two methods are so reciprocally compensative that they consist of methodologies which enhance efficiency of whole PS-wave velocity analysis and generation of CCP gather data.The test results on synthetic data and real data show that the method of PS-wave velocity analysis in this paper can provide initial parameters for high-precise PS-wave velocity analysis.