Full-azimuth circular geometry design and evaluation in marine seismic acquisition
Wang Liping1, Gu Hanming1, Li Peng2, Liu Chuncheng3, Liu Zhibin3
1. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China;
2. Changjiang Geophysical Exploration & Testing Co., Ltd(Wuhan), Wuhan, Hubei 430010, China;
3. CNOOC Research Center, Beijing 100027, China
Abstract:High-efficiency streamer seismic acquisitions can be carried out with recently developed full-azimuth geometry, and better complex structure images can be obtained from this full-azimuth data. We design and evaluate full-azimuth circular geometry for marine seismic in the paper. First we derivate equations of circular tracks, and design a full-azimuth circular geometry. Then we analyze the uniformity for coverage, offset, azimuth, and footprint by comparing full-azimuth circular geometry with narrow azimuth straight line geometry. After that, based on a typical geological model of the deep water area M, we use a circular geometry and a wide-azimuth geometry, and ray tracing illumination to compare their simulated migrated amplitude at targets. Both uniformity analysis and illumination results show that full-azimuth circular geometry have more advantages than conventional parallel geometry.
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