义东地区优质碳酸盐岩储层主控因素及发育模式

Main controlling factors and development mode of high-quality carbonate reservoir in Yidong area

义东地区碳酸盐岩储层非均质性强、易被溶蚀物充填、成因机理和分布演化复杂。选取该地区寒武—奥陶系为研究对象,根据岩石类型、物性特征和储层类型等,利用钻井、岩心、镜下薄片等资料,研究碳酸盐岩储层发育的主控因素;在确定主控因素对优质储层发育影响的基础上,建立研究区碳酸盐岩储层的发育模式。结果表明:义东地区碳酸盐储层储集空间发育类型多样,以裂缝—孔洞型为主,不同区域、不同层系间物性差异显著。优质储层的发育主要受控于岩性岩相组合、不整合和断裂活动及岩溶作用,其中岩性岩相组合是储层发育的物质基础;不整合和断裂活动是储层发育的有利保障;岩溶作用是储层发育的关键。该结论为研究区及类似地区碳酸盐岩储层的勘探开发提供指导。

As for the characteristic of great heterogeneity,high propensity for dissolution and filling,complexity of genesis and distribution evolution of carbonate,choosing Cambrian-Ordovician of Yidong area as the research object.By using various kind of basic data,the main controlling factors of the carbonate reservoir were studied.It shows that there were various types of carbonate reservoir space in Yidong,especially the crack hole.The difference of physical properties is significant in different sections and different layers.High quality reservoir development is mainly controlled by three factors.Among these factors,the combination of lithology and lithofacies is the basement of the reservoir,unconformity and fault is the guarantee of the reservior,karstification is the key of the reservior.The development mode of carbonate reservoir was established after knowing the influence of these factors clearly.