Novel method of automatically picking up water saturation model parameters based on pore structure
SI Zhaowei1, XU Feng1, ZHAO Wenjun2, PENG Hongli1, LIU Tangyan2
1. Exploration and Development Research Institute, Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063000, China; 2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Abstract：For severely heterogeneous reservoirs, rock electric parameters are generally assumed to be constants when their water saturation is calculated. Based on the core data from nuclear magnetic resonance (NMR) experi-ments, data from water-displaced rock conductivity experiments after oil saturation, actual logging data by NMR, and optimized inversion data of sphere-cylinder models, this paper establishes the matching relationship between the pore structure of reservoirs and the parameters of rock conductivity models. According to the ma-tching relationship, the parameters of saturation models can be automatically picked up point by point during logging data processing, so as to improve the calculation accuracy of saturation for complex reservoirs. The method is applied to process measured core data and logging data by NMR from Nanpu Oilfield of Jidong, and the calculation accuracy of water saturation for heterogeneous reservoirs is effectively improved. The application results of actual data show that the algorithm for automatically picking up water saturation model parameters is stable and reliable, and manual intervention is not required in the calculation. In addition, the algorithm has a good application prospect for complex and heterogeneous reservoirs.
司兆伟, 徐风, 赵文君, 彭洪立, 刘堂晏. 基于孔隙结构自动拾取含水饱和度模型参数的新方法[J]. 石油地球物理勘探, 2023, 58(1): 152-160.
SI Zhaowei, XU Feng, ZHAO Wenjun, PENG Hongli, LIU Tangyan. Novel method of automatically picking up water saturation model parameters based on pore structure. Oil Geophysical Prospecting, 2023, 58(1): 152-160.
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