A method simulating converted wave based on one-way wave equation
Li Da-wei1,2, Li Ya-lin1, Yi Cheng3, Chen Guo-min1,3
1. Geophysical Prospecting Company of Chuan-Qing Drilling Engineering Company, Chengdu City,Sichuan Province, 610213,China;
2. Chengdu University of Science and Engineering,Chengdu City,Sichuan Province, 610059,China;
3. Southwest University of Petroleum, Chengdu City,Sichuan Province, 610500,China
Abstract：Using pulse or wavelet as source and one-way wave equation for downward continuation of shot point and receiver point respectively, the zero-delay correlation is carried out for two wave fields in each continuation of one depth step, and further using correlation value multiplied by the reflection coefficient at correlation point to get the value of reflection wavefield. At the same time, the time sum of two wavefields is computed and stack of value of reflection wavefield computed before is carried out in relative time and at relative spatial position based on isochronic stack principle, the forward simulation of common shot record of P-S converted wave can be realized. If interchanging the shot point and receiver point, the simulation of common shot record of S-P converted wave can be realized. Since the simulation method does not need the position of converted point during processing, the simulated data are more objective and true. The converted wave simulated by the method is characterized by direct wave-free and without interference of multiple reflections, and having some dynamic feature, which is a simple and practical method of complex structural simulation and simulation of multi-wave and multi-component.
