P-SV residual static corrections by matching waveform
Pan Shulin1, Li Chenguang1, Wu Bo2, Wang Jian2, Tang Jianming2, Liu Qilin3
1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Exploration and Development Research Institute, Southwest Oil and Gas Exploration and Development Branch Co., SINOPEC, Chengdu, Sichuan 610041, China;
3. Geophysical Department, Chuanqing Drilling Engineering Company Limited, CNPC, Chengdu, Sichuan 610041, China
Abstract:Residual statics method based on P-P and P-SV CRP stacked traces is a special way for large time shift of P-SV data. However P/S wave velocity ratio is usually inaccurate and statics for all the layers are not same in data processing. In this paper, we propose an improved approach to solve the problems. First long wavelength residual statics for SV data are obtained with P wave control. Then short wavelength residual statics for SV data are calculated by conventional residual static corrections. After that velocity analysis and NMO are carried out with the long and short wavelength residual statics to obtain accurate velocity. Finally residual statics at receivers are calculated by residual statics based on P-P and P-SV CRP stacked traces and conventional methods. Applications to real data show that the proposed approach can improve residual statics for multi-wave data.
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