Abstract：Starting from studying propagation rule of seismic converted wave in underground medium,the paper presented a practical method for 3D,3C seismic exploration acquisition design.The basic ideals are that in 3D,3C survey the receiving windows between P-wave and PS converted wave are inconsistence but both are optimum receiving windows in intermediate offsets,some parts of the short and large offsets are needed to be preserved in order to protect the shallow layers and be of benefit for AVO analysis.Therefore,the useful windows of designed geometry made the acquisition of P-wave and PS converted wave reach to 85%,that is the double 85% criterion of 3D,3C acquisition design,resulted in using one spread patch for acquisition of P-wave and PS converted wave and ensuring that the period repeat of folds of PS converted wave is basically not appeared.The study has been successfully used in production objects.
