岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 149154.doi: 10.3969/j.issn.1673-8926.2015.05.024
庞德新
Pang Dexin
摘要:
根据岩心观察及测井和录井资料分析、铸体薄片微观分析和物性测试等,对玛湖凹陷玛 2 井区中二叠统下乌尔禾组砂砾岩储层成因类型进行了分析,认为研究层段储层岩性主要为砂砾岩、含砾砂岩、砂岩及泥质砂岩等。其中,将砂砾岩按成因的不同可进一步划分为牵引流砂砾岩及重力流砂砾岩两类,它们在成熟度、泥质杂基含量、孔隙类型等诸多方面均具有明显的差异,继而造成储集物性的巨大差异。该区砂砾岩的孔隙类型以次生孔隙为主,总体属于低孔、低渗储层;沉积环境(微相)对目的层砂砾岩储层的储集物性具有明显的控制效应;水下分流河道微相发育的牵引流砂砾岩储集物性最好,扇面河道微相次之,泥石流及碎屑流微相内形成的重力流砂砾岩储集物性最差,甚至可形成物性隔夹层。
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