马岭油田北三区储层敏感性及润湿性分析

Reservoir sensitivity and wettability of North Ⅲ block, Maling Oilfield

对马岭油田北三区储层敏感性及润湿性进行了室内分析。结果表明,北三区储层主要存在水敏和酸敏,无速敏反应。随着注水速度的增大,渗透率也随之增高,并没有出现速敏反应,可采用提高注水速度的办法来增加产量。随着模拟地层水矿化度的降低,测得的渗透率也随之降低,储层水敏性为中等偏强。酸敏性评价指数为0.08～0.52,表现为强酸敏,不利于采取酸化解堵增产措施。岩石表现为弱亲水-亲水性润湿,有利于后期注水开发。

Reservoir sensitivity and wettability of North Ⅲ block, Maling Oilfield were analyzed by laboratory method. The results indicate that the reservoir in the North Ⅲ block is water sensitive and acid sensitive, but not velocity sensitive. With the increasing of water injection rate, the permeability increased and there appeared no velocity sensitivity, so oil production can be improved by improving injection rate. As the lowering of simulated formation water salinity, the measured permeability also reduced, and reservoir water sensitivity is medium strong. The evaluation index of acid sensitivity is 0.08～0.52, showing strong acid sensitivity, so it is disadvantageous for stimulation treatment by acidizing and plugging removal. The rock is weak water wetting-water wetting, which is good for waterflooding in late stage of development.