A model study of residual oil distribution jointly using crosswell and borehole-surface electric potential methods
Su Ben-Yu1, Yasuhiro Fujimitsu1, Xu Jing-Ling2, and Song Jian-Yong3
1. Laboratory of Geothermics, Department of Earth Resources Engineering, Kyushu University, 744 Motooka, Nishi-ku,
Fukuoka, 819-0395, Japan
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China.
3. Geophysical Department, CNPC RIPED, Beijing 10083, China.
Abstract：
Although high resolution can be provided by electrical logging, the measured electrical log range is narrow and is limited to near the well. Borehole-surface electric potential measurements are able to detect a wide enough range but its resolution is limited, particularly for reservoirs with complex oil and water distribution or complicated structure. In this study, we attempt to accurately locate the 3-D reservoir water and oil distribution by combining borehole-surface and crosswell electric potentials. First, the distributions of oil and water in both vertical and horizontal directions are detected by the borehole-surface and crosswell electric potential methods, respectively, and then the measured crosswell potential result is used to calibrate the measured borehole-surface electric potential data to improve vertical resolution so that the residual oil distribution is determined in a lower half-space with three dimensions. The evaluation of residual oil distribution is obtained by investigation of differences between the simulation results of the reservoir with and without water fl ooding. The fi nite difference numerical simulation results prove that the spatial residual oil distribution can be effectively determined by combining the crosswell and borehole-surface electric potentials.
SU Ben-Yu,Yasuhiro Fujimitsu,XU Jing-Ling et al. A model study of residual oil distribution jointly using crosswell and borehole-surface electric potential methods[J]. APPLIED GEOPHYSICS, 2012, 9(1): 19-26.
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