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Nonlinear amplitude versus angle inversion for transversely isotropic media with vertical symmetry axis using new weak anisotropy approximation equations

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Petroleum Science 2020年第3期17卷 628-644页

作者： Lin Zhou Zhuo-Chao Chen Jing-Ye Li Xiao-Hong Chen Xing-Ye Liu Jian-Ping Liao Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and TechnologyXiangtan 411201HunanChina State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China National Engineering Laboratory for Offshore Oil Exploration.China University of Petroleum Beijing 102249China College of Geology and Environment Xi'anUniversity of Science and TechnologyXi'an 710054ShaanxiChina

In VTI media,the conventional inversion methods based on the existing approximation formulas are difficult to accurately estimate the anisotropic parameters of reservoirs,even more so for unconventional reservoirs with strong seismic ***,the above problems can be solved by utilizing the exact reflection coefficients ***,their complicated expression increases the difficulty in calculating the Jacobian matrix when applying them to the Bayesian deterministic ***,the new reduced approximation equations starting from the exact equations are derived here by linearizing the slowness *** relatively simple form and satisfactory calculation accuracy make the reduced equations easy to apply for inversion while ensuring the accuracy of the inversion *** addition,the blockiness constraint,which follows the differentiable laplace distribution,is added to the prior model to improve contrasts between ***,the concept of GLI and an iterative reweighted least-squares algorithm is combined to solve the objective ***,we obtain the iterative solution expression of the elastic parameters and anisotropy parameters and achieve nonlinear AVA inversion based on the reduced *** test results of synthetic data and field data show that the proposed method can accurately obtain the VTI parameters from prestack AVA seismic data.

关键词： Transversely isotropic media with vertical symmetry axis(VTI) New reduced approximation equations differentiable laplace distribution Blockiness constraint

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