北三台凸起南斜坡储层敏感性研究

Study on Sensitivity of Layers at South Slope in Beisantai Prominence

实验证实,北三台凸起南斜坡各时代储层都具有很强的敏感性,水敏、速敏与层系有关,碱敏、酸敏与层系无关。水敏随粘土矿物蒙脱石总含量的增高而增强,同时随孔喉半径的增大而减弱;速敏同样随蒙脱石含量的增高而增强,但却随高岭石含量的增加和储层颗粒分选性的变好而减弱;碱敏与酸敏互成消长,本区储层出现很强的碱敏性,碱性钻井液已对储层造成极大的伤害;较低的临界盐度使储层所受盐敏伤害较弱。最后针对各类敏感性的产生条件,提出了具体的防治措施与建议。

 Based on the experience, it is considered that the reservoir at any age has strong sensitivity at south slope in Beisantai prominence. Water sensitivity and velocity sensitivity have some relationship with series of strata. But alkali sensitivity and acid sensitivity have no. Water sensitivity increases with the amount of montmorillonite growing, and decreases with the radius of pore throat enlarging. Velocity sensitivity also increases with the amount of montmorillonite growing, and decreases with the amount of kaolinite growing and with the sorting of reservoir grain getting better. Alkali sensitivity and acid sensitivity counteract. There is strong alkali sensitivity in local reservoir, and alkali drilling fluid does great damage to the reservoir, but the low critical salt sensitivity does less damage to the reservior. According to the generating condition of different kinds of sensitivity, the detailed preventive measures and suggestions are pointed out..