P-SV Converted Wave Extraction And Imaging

In view of our country some of the old oil and residual oil and gas distribution is highly fragmented, especially continental clastic rock in the effective identification of thin layer, low amplitude, small fault structure, the accurate prediction of reservoir boundary and reservoir, monitor the fluid is more and more difficult, can not meet the need of exploration and development of the problem as to rely solely on the longitudinal wave research on processing, P-S converted wave, hope can effectively and converted wave their advantage by longitudinal wave field information, solve the clastic rock reservoir and fluid prediction problems.This article mainly has conducted the research from following several aspects, for single point digital geophone acquisition of P-wave and S-wave data signal to noise ratio is low, according to the difference of effective wave and noise wave in frequency and apparent velocity, the band-pass filtering and F-K filtering method, the converted wave field separation, effective extraction of the P-S conversion wave; existing hyperbolic time-distance equation can not be converted wave reflection event level, not suitable for converted wave velocity analysis and NMO processing, therefore, the four parameters of converted wave velocity analysis method, solves the problem of the conversion of wave velocity analysis, the imaging of converted wave; poststack migration method based on distance stack section assumption in the strict zero offset, but in most cases, this assumption is not established, the results will inevitably cause great error, so the research on the conversion of four parameter velocity wave prestack time migration method based on P-S, realizes the converted wave pre-stack migration imaging.