英东复杂油藏储层微观孔隙结构及其对渗流机理的影响

The Microscopic Pore Structure of Yingdong Complex Reservoirs and Its Impact on the Percolation Mechanism

针对柴达木盆地英东油田N22储层非均质性强,微观孔隙结构复杂,开发层位不明确等问题,利用扫描电镜薄片观察,通过高压压汞实验和渗流实验对储层岩石的物性特征、微观孔隙结构和渗流能力进行了详细的研究。实验结果表明:该区储层岩石的孔隙结构可分为Ⅰ-Ⅴ共5类,其中Ⅰ、Ⅱ类孔隙对应物性最好的储层,应该作为重点开发的层位。

Aiming at the problem of serious heterogeneity of N22 reservoir in Qaidam basin Yingdong oilfield, a detailed study is carried out by scanning electron microscope sheet observation, high pressure mercury experiment, seepage experiment analysis to describe reservoir rock characteristics, microscopic pore structure and flow capacity. Experimental results show that the reservoir rock pore structure in this area can be divided into five categories. Rock porosity, pore throat type and average pore throat radius are the main factors that affect the ability of the reservoir seepage.