Simulation of carbonate fracture-cavern reservoir reflection characteristics with forward modeling
Ma Lingwei1,2, Gu Hanming3, Li Zongjie4, Lü Shanshan5
1. Geophysical Research Institute, SINOPEC, Nanjing, Jiangsu 211103, China;
2. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210046, China;
3. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
4. Exploration and Development Research Institute, Northwest Oilfield Branch Co., SINOPEC, Urumqi, Xinjiang 830011, China;
5. East China 814 Geophysics Survey Company Limited, Nanjing, Jiangsu 210007, China
Abstract：Establishing the relationship among seismic response with space geometry and petrophysical parameters of fracture-cavern reservoir is the key to quantitative description and prediction of carbonate fracture-cavern reservoirs, and seismic response characteristics analysis is a premise of accurate imaging. Based on the numerical simulation of heterogeneous media, we discuss impacts of different acquisition parameters and imaging approaches on bead-like reflection characteristics of fracture-cavern reservoirs. Forward modeling results show that reflection energy in fracture-cavern body on seismic sections become stronger when smaller group interval and near offset stack are adopted, and that prestack migration imaging is a must for fracture-cavern reservoir analysis. In this paper, we analyze quantitatively influences of vertical scale, lateral scale, infilling types, and background factors on reflection characteristics of fracture-cavern reservoirs, and get some meaningful conclusions, which provide a scientific basis to understand reflection characteristics of actual fracture-cavern reservoirs.
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