Analysis of stochastic velocity field modeling uncertainty for variable-velocity mapping
Yue Youxi1, Liu Chenxi1, Wen Xue2, Zhang Xian1
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. Shenzhen Branch, CNOOC Ltd, Guangzhou, Guangdong 510240, China
Abstract:Deterministic methods used in velocity modeling and variable-velocity mapping cannot be used to characterize uncertainty of depth structure maps, and the reliability of these methods cannot be directly evaluated. Therefore, a stochastic velocity modeling method based on the theory of stochastic simulation is put forward to analyze probability field simulation and sequential Gauss simulation. Statistical analysis on the uncertainty of multiple realizations obtained by stochastic simulation is carried out. Application tests show that there is no velocity difference at conditional data points in the space, and velocity at non-conditional data points is uncertain. Velocity field uncertainty obtained by sequential Gauss simulation is smaller than that obtained by probability field simulation.
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