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The Diagenesis in Sequence Stratigraphic Framework of the Upper Paleozoic, Ordos Basin
Author(s): 
Pages: 923-933
Year: Issue:  6
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  岩石类型成岩阶段成岩相储层预测;
Abstract: 鄂尔多斯盆地上古生界主要发育石英砂岩、岩屑砂岩、杂砂岩、"牛毛毡砂岩"、黑色石英砂岩等五种砂岩类型.这些砂岩具有成份成熟度较高、结构成熟度中-低、以正粒序为主、粒级普遍为中粗粒、储层填隙物类型多、含量变化大的特点.经历了三个重要成岩阶段:早成岩压实期-原生孔隙大量破坏损失期,中成岩A期-有机酸溶蚀-次生孔隙发育期,中成岩B期-埋藏压溶再胶结成岩期.在SQ8主要发育压溶、高岭石溶蚀、石英次生加大等成岩作用.SQ11主要发育硅质胶结、碳酸盐胶结成岩作用.成岩相可分为三级五类,即Ⅰ强压溶-石英加大相;Ⅱ压溶-碳酸盐溶蚀-高岭石交代相及溶蚀-弱杂基充填-高岭石交代相;Ⅲ强压实-粘土胶结相及强压实-碳酸盐胶结、交代相.区内储层整体为低孔低渗的致密砂岩储层,以发育次生孔隙为主,包括粒间溶孔、粒内溶孔和高岭石晶间孔,原生孔隙较少保留.通过对沉积砂体展布、储层成岩相类型及储集性能的综合分析,对有利的储层分布区带进行了预测.
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