Converted S-wave reflection coefficient extraction from the longitudinal wave data
Shen Shi'an1, Yong Xueshan2, Gao Jianhu2, Li Shenjun2, Wang Hongqiu2, Chen Hongling3
1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China; 2. Northwest Branch, Research Institute of Petroleum Exploration & Development, PetroChina, Lanzhou, Gansu 730020, China; 3. College of Geophysics and Information Engineering, China University of Petroleum(Beijing), Beijing 102249, China
Abstract：We propose in this paper a method to extract converted S-wave wave information from P-wave data.The theoretical basis of this method is Zoeppritz equation and Zheng Xiaodong AVO simplification equation.First, taking respectively reflection coefficients of P-wave and converted S-wave as even and odd functions characteristics in Zheng AVO simplification equation, the derivative of P-wave reflection coefficient along the sinusoidal direction of the incident angle is used to calculate an initial converted S-wave reflection coefficient.Then, the first and third terms are corrected by double coefficients.Finally, due to the accuracy difference between the Zheng's simplification and the Zoeppritz equation, a residual error compensation is applied to obtain quasi-converted S-wave reflection coefficient.The final quasi-converted S-wave is obtained if the velocity ratio and wavelet of the converted S-wave are known.The proposed method is validated by model data.It is satisfactory that the fitting degree of the quasi-converted S-wave and the exact solution of Zoeppritz is more than 0.95, which indicates that the proposed method is strongly feasible.
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