A joint inversion method using amplitude and velocity anisotropy
ZHOU Xiaoyue1, GAN Lideng1, YANG Hao1, WANG Hao2, JIANG Xiaoyu1
1. Research Institute of Petroleum Exploration & Development, CNPC, Beijing 100083, China; 2. Southern Sichuan Gas District of PetroChina Southwest Oil & Gasfield Company, Luzhou, Sichuan 646000, China
Abstract:The fracture prediction method based on amplitude anisotropy with high resolution is sensitive to the degree of medium anisotropy and easy to realize,but it is poor in dealing with noises and has high requirements on the quality of seismic data.For this reason,a joint inversion method using prestack amplitude and velocity anisotropy is proposed.For each time window,the anisotropic gradient obtained from velocity inversion at the bottom of the time window is taken as a constraint of amplitude inversion at the top of the time window,and then an inversion volume can be obtained by moving the time window.Applications to model and real data show that: ①compared with prestack and poststack amplitude anisotropy inversion,the inversion accuracy of the proposed method is the highest; ②in the GS1 well block,the result of prestack velocity anisotropy inversion coincides with the fracture curve of the well,which can be used as a constraint of amplitude inversion,but the resolution of velocity anisotropy inversion is lower than that of amplitude anisotropy inversion.The joint inversion of prestack amplitude with velocity anisotropy can improve the resolution of velocity inversion.
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