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沉积学报  2015 

混积岩储层特征——以酒泉盆地青西凹陷下白垩统混积岩为例

DOI: 10.14027/j.cnki.cjxb.2015.02.017, PP. 376-384

Keywords: 混积岩,储层,酒泉盆地,下白垩统

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Abstract:

混积岩是指陆源碎屑与碳酸盐组分经混合沉积作用而形成的岩石,广义混积岩包括由陆源碎屑与碳酸盐组分在空间上构成交替互层或夹层的混合。本文在大量资料调研基础上,结合酒泉盆地青西凹陷下白垩统混积岩储层薄片观察、场发射扫描电镜观察、全岩及黏土矿物分析、压汞测试、纳米CT等研究工作,分析了混积岩储层岩性组合、储层特征等。宏观上,混积岩岩性复杂多样,由白云质泥岩、泥质白云岩、灰质泥岩、灰质白云岩、白云质灰岩等组成,剖面上呈现大段厚层式、厚夹薄层式、近等厚互层式三种组合样式;微观上,黏土矿物、碳酸盐矿物及有机质等呈纹层状或块状分布;储集空间主要为微—纳米级的粒间孔、粒内孔以及微裂缝,矿物组成及其含量是影响储集空间类型的一个主要因素;多数混积岩储层孔隙度、渗透率低,为致密储层。

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