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运用岩心、铸体薄片、扫描电镜和化验资料等,系统研究了柴达木盆地北缘地区下干柴沟组储层孔隙结构特征,并对储层发育的控制因素进行了分析。结果表明,下干柴沟组储集空间以原生粒间孔为主,其次为溶蚀孔和少量裂缝。储层综合评价为中孔—细喉道—中渗型储层。沉积相带是储层储集性能的主要控制因素,该区发育的辫状河河床亚相的砂砾岩是主要储集岩。成岩作用对储集性能也有影响,其中压实作用和胶结作用降低孔隙度,溶蚀作用增加次生孔隙。
The pore structure of the Lower Ganchaigou Formation reservoir in the northern margin of the Qaidam Basin was systematically studied by using cores, castings, scanning electron microscopy and laboratory data. The control factors of reservoir development were also analyzed. The results show that the reservoir space of Xiaganchaigou Formation is dominated by intergranular intergranular pores, followed by dissolution pores and a few cracks. The comprehensive evaluation of the reservoir is a mesopore-thin throat-medium permeability reservoir. Sedimentary facies belt is the main controlling factor of reservoir performance. The sandy conglomerate of braided river bed subfacies in this area is the main reservoir rock. Diagenesis also has an impact on reservoir properties, in which compaction and cementation reduce porosity and dissolution increases secondary porosity.