阿尔金山前东段牛东地区侏罗系成岩作用及其对储层物性的影响

利用岩心、岩石薄片、扫描电镜及物性分析等资料，对柴达木盆地北缘阿尔金山前东段牛东地区侏 罗系储层特征进行了研究，并对储层发育的控制因素进行了分析。 结果表明：牛东地区侏罗系碎屑岩储 层岩石类型主要为长石岩屑砂岩和岩屑长石砂岩，储集空间主要为原生粒间孔、溶蚀孔及裂缝，其中溶 蚀孔是改善储层物性的关键因素；成岩作用对牛东地区侏罗系储层物性影响较大，压实作用和胶结作用 导致储层孔隙损失明显，使储层物性变差，而溶蚀作用和破裂作用有效地改善了储层物性，控制了相对 有利储层的发育。

Diagenesis of Jurassic and its influence on reservoir properties in Niudong area,eastern Altun foreland

Based on the data of cores, cast thin sections, scanning electronic microscope and physical properties, the reservoir characteristics of Jurassic in Niudong area of Altun foreland in northern margin of Qaidam Basin were studied, and the controlling factors of reservoir development were analyzed. The results show that clastic reservoirs of Jurassic are mainly of feldspathic litharenite and lithic arkose; primary intergranular pore, dissolved pore and fracture are the main reservoir space types, and the dissolved pore is the key factor for improving the reservoir properties; diagenesis has great influence on the reservoir properties. Compaction and cementation made the reservoir properties poor, but dissolution and fracturing improved the reservoir properties.