鄂尔多斯盆地上古生界太原组储层岩石学特征及其对物性的控制研究

Characteristics of Reservoir Petrological in Taiyuan Formation in East of Ordos Basin and Their Controls on Reservoir Physical Property

根据岩心观察和铸体薄片、扫描电镜、压汞等分析资料,对鄂尔多斯盆地东部上古生界太原组储层的岩石学特征及其对物性的控制作用进行了研究。结果表明,该区储层岩性主要以中-粗粒岩屑石英砂岩及岩屑砂岩为主,其成分及结构成熟度较低;储层物性随砂岩成分成熟度增高而变好,同时储层物性分布规律明显受各种胶结物的控制,以硅质、伊利石和碳酸盐岩为主;硅质含量与储层物性呈正相关性,碳酸盐岩含量与储层物性呈负相关性,伊利石含量与储层物性相关性不明显。

Based on core observation,cast thin section,scanning electron microscope and mercury porosimetry,the author studies the reservoir petrological characteristics and their control on the reservoir physical property of Taiyuan Formation in the eastern Ordos Basin.The research shows that reservoir lithology in this area is mainly of the coarse grain lithic quartz sandstone and lithic sandstone, component and structure maturity is lower.Reservoir physical property is better with the increased sandstone component maturity,meanwhile the distribution regularity of reservoir property is obviously controlled by the various kinds of cements,including silicon,illite and carbonate.Siliceous content and reservoir physical property have positive correlation,carbonate content and reservoir physical property have negative correlation,the correlation between illite content and reservoir physical property is not obvious.