Impedance inversion based on small-angle stacking seismic data
Li Meng1, Liu Zhen2, Liu Minzhu3, Ma Yuehua4, Shao Wenchao5
1. Researceh Institute of Petroleum Exploration and Production, SINOPEC, Beijing 100083, China; 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China; 3. Essca Company, Beijing 100101, China; 4. Dagang Branch, GRI, BGP Inc., CNPC, Tianjin 300280, China; 5. Geophysical Research Institute, SINOPEC, Nanjing, Jiangsu 211103, China
Abstract:Impedance inversion is a key tool in reservoir prediction and characterization as it converts seismic reflection information in more visual and explainable strata information such as impedance,velocity,and density.Theoretical derivation and seismic data tests show that seismic reflection information at large incident angles damage greatly the resolution of full-angle stacking seismic data,and conventional poststack impedance inversion cannot well characterize thin reservoirs.In order to well predict thin reservoirs,we propose an impedance inversion based on small-incident angle stacking seismic data.The application of the proposed approach in reservoir prediction in a marine block,West Africa shows that this impedance inversion results match very well with logging data and depict clearly subtle reservoirs.
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