东营凹陷沙河街组页岩油储层微观孔隙结构研究
Journal of Southwest Petroleum University(Science & Technology Edition)(2017)
Abstract
储层微观孔隙结构研究可为页岩油勘探开发提供依据.利用氩离子抛光-扫描电镜实验和孔隙图像储层结构参数统计方法,分析了渤海湾盆地东营凹陷沙河街组18块岩芯样品的微观孔隙发育特征.结果表明,东营凹陷沙河街组页岩油层段的孔隙类型主要包括粒间孔、溶蚀孔、晶间孔和晶内孔,泥质粒间孔提供的面孔率贡献最大,溶蚀孔对有较高的面孔率贡献,晶间孔和晶内孔的面孔率贡献最低.页岩油储层孔隙的孔径属于纳米级和微米级,数量上纳米级孔隙占绝对优势,但储层面孔率主要由在数量上不占优势的微米级孔隙提供.因此,东营凹陷沙河街组页岩油层段的主要储集空间属于微米级孔隙.
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Key words
FIB-SEM,microscopic pore,plane porosity,shale oil,Shahejie Formation,Dongying Sag
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