鄂尔多斯盆地薛岔地区长6储层真实砂岩微观模型水驱油的实验研究

Experimental Study on Water Flooding of Chang6 Reservoir in Xuecha Area of Ordos Basin by Real Sandstone Micro-model

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 water flooding experiment with real sandstone micro-model, influence factors of the water flooding efficiency of Chang6 reservoir in Xuecha area of Ordos basin were analyzed. The results show that the Chang6 reservoir in the research district has strong heterogeneity and poor physical properties. Experimental models include three main displacement types of uniform, finger and mesh. Reservoir water drive degree was poor, and residual oil formed because of oil film and circumfluence. Good developed pores formed because of good pore throat sorting, which reduced the formation of residual oil. The displacement mechanism and remaining oil distribution features are different because of different rock particles surface wettability.