鄂尔多斯盆地环县地区长8储层敏感性评价

Sensitivity evaluation of Chang-8 reservoir in Huan county of Ordos basin

针对鄂尔多斯盆地环县地区长8储层低孔低渗的特点,对长8储层的速敏性、水敏性、盐敏性、碱敏性和酸敏性进行了储层敏感性试验,结合该储层岩石特征进行敏感性分析评价。结果表明,该区储层主要表现为弱速敏、弱水敏、弱盐敏、弱碱敏和中等程度酸敏,临界流速0.5 mL/min。因此,在鄂尔多斯盆地环县地区长8储层开发生产过程中应重点防治储层酸敏性给储层带来的伤害。

Aiming at the low porosity and low permeability characteristics of Chang- 8 reservoir in Huan county of Ordos basin, reservoir sensitivity test was carried out by speed sensitivity, water sensitivity, salt sensitivity, alkali sensitivity and acid sensitivity of Chang-8 reservoir. Meanwhile, combined with reservoir rock characteristics, sensitivity was analyzed and evaluated. The results showed that the reservoir in this area has weak speed sensitivity, weak water sensitivity, weak salt sensitivity, weak alkali sensitivity and moderate acid sensitivity, and the critical flow velocity is 0.5 mL/min. Therefore, it is important to prevent the reservoir damage caused by the acid sensitivity in the production development of Chang-8 reservoir in Huan county of Ordos basin.