鄂尔多斯盆地子长地区盒8段储层敏感性研究

Reservoir sensitivity study of He 8 reservoir from Zichang area in Ordos basin

在野外露头及岩心观察的基础上,通过室内敏感性实验,结合铸体薄片、物性测试、扫描电镜、压汞等大量测试资料的综合分析,对子长地区盒8段储层的敏感性特征及形成机理进行了研究。研究结果表明,研究区盒8储层具有中等偏弱速敏,弱水敏,弱酸敏,弱盐敏,中等偏弱碱敏的特征。敏感性的形成不仅受储层中黏土矿物的类型及存在形态影响,同时与复杂的孔隙结构有关。

On the basis of the field outcrop and core observation,through the indoor sensitivity experiment,combining with the casting thin sections,physical properties testing,scanning electron microscopy(sem),mercury injection and other comprehensive analysis of a large number of test data,the study on the reservoir sensitivity characteristics and its formation mechanism was carried out.The study results show that He 8 reservoirs are of medium-to-weak velocity sensitivity,weak water sensitivity,weak acid sensitivity,salt sensitivity,medium-to-weak base sensitive characteristics.The formation of the sensitivity was not only affected by the type of clay minerals content of a reservoir and existing form,but also was associated with complex pore structure at the same time.