安塞油田高52区低渗油藏储层敏感性研究

为提高安塞油田油井产能,针对该区低渗储层的敏感性特征进行了细致研究。通过系统的岩心流动实验,定量评价了储层敏感程度。研究结果表明:高52区长10段低渗透储层整体存在强水敏性(水敏指数平均为77.80%,临界矿化度为10 000 mg/L)、弱碱敏性(碱敏指数平均为15.82%)、强酸敏性(酸敏指数平均为90.58%)损害;储层速敏性不仅与储层黏土矿物组成含量有关,还与储层渗透率和孔隙结构有一定关系。对该区块储层的敏感性研究为下一步的油气开采提供了依据。

Study on reservoir sensitivity for low permeability reservoirs in the Gao 52 block of Ansai oilfield

Systematic core flow experiments have been carried out to study the sensitivity characteristics of the low permeability reservoirs in Ansai oilfield in order to improve oil well productivity. The study result shows that the low permeability reservoirs in the Chang 10 member of Yanchang formation in Gao 52 block are generally strong water-sensitive(average water sensitivity index 77.80%,critical salinity 10 000 mg/L) ,weak alkali-sensitive(average alkali sensitivity index 15.82%) ,strong acid-sensitive(average acid sensitivity index 90.58%);and the velocity sensitivity of the reservoirs is related not only to clay mineral composition,but also to reservoir permeability and pore structure. Reservoir sensitivity study provides basis for further oil and gas recovery in this block.