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通过真实砂岩微观模型水驱油试验,对鄂尔多斯盆地薛岔地区长6储层水驱油效率的影响因素进行分析研究。结果表明:研究区长6储层具较强的非均质性,较差的物性,实验模型有均匀、指状、网状三种主要驱替类型。储层水驱动用程度差,通过油膜、卡断和绕流形成残余油。良好的孔喉分选性,形成了发育较好的孔隙,减少了残余油的形成机会。驱油机理和剩余油分布特征因为岩石颗粒表面润湿性的不同而有差别。
Through the real sandstone microscopic model water flooding test, the influencing factors of water flooding efficiency of Chang 6 reservoir in Xuecha area of Ordos Basin are analyzed. The results show that the reservoirs of Chang 6 in the study area are characterized by strong heterogeneity and poor physical properties. The experimental models have three major types of displacement: uniform, finger and net. Reservoir water drive with the poor, through the oil film, stuck and flow around the formation of residual oil. Good pore throat sorting, forming a better development of the pores, reducing the formation of residual oil opportunities. The mechanism of oil displacement and the remaining oil distribution differ due to the wettability of the rock particle surface.