Aiming at Yanchang Pereoleum Group Dingbian Block in the special low permeability reservoir, the problem of how to further enhance oil recovery after water flooding, oil displacement experiment is carried in laboratory. By simulating reservoir conditions such as temperature 50 t and so on, researched on the displacement effect of three microorganism S, M, P in the Dingbian natural core columns. Analyzed oil displacement mechanism of the three microorganism S、M、P through combining injection pressure and the recovery curve in the core. When mass concentration of microorganism M was 10% , slug size was 0.5 pore volum, recovery could reach 9%. The results demonstrate that microorganism M has a good adaptability for low permeability, micro-fractures fixed side block.%针对延长油田定边区块特低渗透油藏,水驱后如何进一步提高采收率的问题,开展了微生物驱提高采收率实验研究.模拟油层温度50℃等条件,对三种微生物菌种S、M、P在定边天然岩心柱中的驱油效果进行研究.结合注入压力和采收率曲线动态分析三种微生物菌种在岩心中的作用规律.浓度为10％的菌种M的最佳用量为0.5 PV,提高采收率效果最好可达到9％,从而说明菌种M对低渗透、微裂缝发育的定边区块具有良好的适应性.
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