Low-amplitude structural imaging based on seismic numerical simulation and physical modeling
TIAN Yancan1,2, SHI Wenwu3, WANG Guoqing1,2, XU Zhonghua1,2, JIANG Chunling1,2
1. Key Laboratory of Reservoir Description, CNPC, Lanzhou, Gansu 730020, China; 2. Research Institute of Petroleum Exploration & Development-Northwest, PetroChina, Lanzhou, Gansu 730020, China; 3. Exploration and Development Research Institute, Jidong Oilfield Company, PetroChina, Tang-shan, Hebei 063000, China
Abstract:Exploration cases show that low-amplitude structures can form small but high-yield reservoirs with favorable conditions of source-reservoir-cap and oil-gas migration. However, traditional me-thods of velocity modeling cannot eliminate lateral variation of velocity usually caused by the varying proportion of sand in shallow formations and produce a velocity model with low precision, giving rise to poor imaging precision of low-amplitude structures in Matouying area in Jidong oilfield with big drilling deviation. In this paper, the velocity modeling technology for low-amplitude structural imaging based on seismic numerical simulation and physical modeling is proposed. A simplified model that highlights the major characteristic in this area is designed for seismic numerical simulation and physical modeling. Seismic simulation experiments show that correct imaging results can be obtained with the real velocity. At the same time, real velocity and stratigraphic form are used as the prior information for velocity modeling of low-amplitude structures to validate the technology.The results show that the tomographic inversion along the formation can create a precise initial velocity model, and the high-density structure-constrained grid tomographic imaging technology can build a highly precise model that indicates the trend in velocity.Therefore, the joint application of two modeling technologies leads to more precise imaging of low-amplitude structures.
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