关键词: 济阳坳陷, 低电阻率储层, 地层水, 临界矿化度, 数值模拟, 逾渗网络模型

Abstract: The microcosmic influence factors for electrical properties of low-resistivity reservoir and their influence law in Shinan and Jinjia oilfields were investigated using the percolation network model.The microcosmic factors,such as porous structure,fluid properties,type and content of shale,were analyzed.The results indicate that the microcosmic influence factors of forming the low-resistivity reservoir in Jiyang Depression mainly include amount of micropores,connectivity of pore and salinity of formation water,as well as type and content of shale.For different oilfields,because of the difference in formation properties,the factors mentioned above have different influence intensity on rock resistivity,and the critical salinity of formation water for forming the low-resistivity reservoir is also different.The critical salinities of formation water in Shinan and Jinjia oilfields are 170 grams per liter and 4 grams per liter,respectively.

Key words: Jiyang Depression, low-resistivity reservoir, formation water, critical salinity, numerical simulation, percolation network model