Acoustic impedance inversion of zero-offset VSP data
Wang Jing1, 2, Liu Yang1, 2, Sun Zhe1, 2, Tian Hong3, Su Hua3, Zhao Qianhua3, and Liu Yingyu3
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China.
2. CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing 102249, China.
3. Oilfield Technology Department, China Oilfield Services Limited, Beijing 101149, China.
Abstract Highly precise acoustic impedance inversion is a key technology for pre-drilling prediction by VSP data. In this paper, based on the facts that VSP data has high resolution, high signal to noise ratio, and the downgoing and upgoing waves can be accurately separated, we propose a method of predicting the impedance below the borehole in front of the bit using VSP data. First, the method of nonlinear iterative inversion is adopted to invert for impedance using the VSP corridor stack. Then, by modifying the damping factor in the iteration and using the preconditioned conjugate gradient method to solve the equations, the stability and convergence of the inversion results can be enhanced. The results of theoretical models and actual data demonstrate that the method is effective for pre-drilling prediction using VSP data.
WANG Jing,LIU Yang, Sun-Zhe et al. Acoustic impedance inversion of zero-offset VSP data[J]. APPLIED GEOPHYSICS, 2009, 6(2): 150-158.
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2009, Vol. 6 
