Low Resistivity Reservoir and Water Saturation Evaluation of Qigu Formation in Niujuanhu Area in Santanghu Basin

Abstract

Abstract: The oil-gas reservoir in Upper Jurassic Qigu formation of Niujuanhu area in Santanghu basin is obviously characterized by low resistivity. The study shows that the clay minerals and their occurrences are the main influencing factors for forming the low-resistive reservoir. The double clay film enveloping the grains creates relatively strong additional conductive property through cationic exchange of the clay film, which is the main reason for it. By comparison with Archie's Equation, it is indicated that using "dual water model" to evaluate water saturation in reservoirs is the more effective method in this area.

Key words: Santanghu basin, low resistivity, clay mineral, water saturation, dual water model

CLC Number:

GUO Mo-zhen, ZHANG Sheng-bing, WEN Chuan-jiang, XIAO Lin-peng, CHEN Chang-xu, WANG Bin-wen. Low Resistivity Reservoir and Water Saturation Evaluation of Qigu Formation in Niujuanhu Area in Santanghu Basin[J]. Xinjiang Petroleum Geology, 2008, 29(6): 725-727.

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Low Resistivity Reservoir and Water Saturation Evaluation of Qigu Formation in Niujuanhu Area in Santanghu Basin

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