大港油田张东地区低渗储层黏土矿物分析及敏感性研究

摘要

针对大港油田张东地区沙二段低渗透砂岩储层目前注水压力高、产量低的问题,采用岩心分析技术和岩心驱替实验,对该区块的黏土矿物进行了矿物分析和敏感性实验研究.实验结果表明:该区块黏土矿物类型主要有高岭石、伊利石、伊利石/蒙脱石混层和绿泥石4种；产状主要为架桥状和薄膜状,且储层属于中等黏土矿物储层；在开发过程中,储层表现出中等偏弱速敏、强水敏、强酸敏和强碱敏的特点.对张东地区以后的开发过程提出了一些生产上的建议.%The low permeability sandstone reservoir in the Es2 member of Zhangdong area, Dagang oilfield is facing problems of high water injection pressure and low production. Clay mineral analysis and sensitivity study have been conducted through core analysis and core displacement experiment. The experiment results indicate that the clay minerals in this area mainly include kaolinite, il-lite, illite/smectite mixed layer and chlorite, with the dominant occurrence showing bridge and thin film shapes, and the reservoir belongs to moderate clay mineral reservoir. In the process of development, the reservoir has presented characteristics of moderate to weak velocity - sensitivity and strong water - , acid - and alkali - sensitivity. This paper proposes some suggestions for future development in Zhangdong area.