Abstract:Conventional velocity model building for prestack depth migration cannot take into consideration seismic azimuth information so that the final velocity model and depth imaging are not as good as expected. In order to take advantage of wide azimuth 3D seismic data, we propose in this paper a wide azimuth tomography workflow in the OVT domain to build an earth model with great accuracy and details. This workflow can resolve small scale velocity changes using azimuth information from seismic data. Butterfly gathers through full azimuth inversion in the OVT domain are much better flattened. Not only azimuth moveout changes are almost disappeared, but also depth target (carbonate caves) imaging is greatly improved. From our analysis of the survey, we concluded that these azimuth moveout variations are primarily caused by overburden lateral velocity heterogeneity rather than potential azimuth velocity anisotropy. Compared with conventional model building approach and sector-based multi azimuth tomography, OVT-based wide azimuth tomography inversion is more efficient and flexible, and can obtain higher resolution velocity model and better depth imaging.
段文胜, 李飞, 黄录忠, 李世吉, 孙海军. OVT域宽方位层析速度建模与深度域成像[J]. 石油地球物理勘探, 2016, 51(3): 521-528.
Duan Wensheng, Li Fei, Huang Luzhong, Li Shiji, Sun Haijun. Wide azimuth tomographic velocity model building and depth imaging in the OVT domain. OGP, 2016, 51(3): 521-528.
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