柴达木盆地狮子沟地区中深层储集空间形成机制

柴达木盆地狮子沟地区目前发现的油气主要聚集于中深层古近-新近系,其储集空间基本类型主要包括剩余原生粒间孔隙、次生溶蚀孔洞和裂缝,并形成5类储集空间组合。具有储渗意义的储集空间类型主要是次生溶蚀孔洞和裂缝。受压实作用和胶结充填作用以及沉积环境的影响,剩余原生粒间孔隙不甚发育,而次生溶蚀孔洞和构造裂缝发育。除了油源流体外,大气降水可能在有效储集空间的形成中起到过重要作用。

Formation Mechanism of Middle-Deep Reservoir Space in Shizigou Area in Qaidam Basin

Petroleum in Shizigou area in southwestern Qaidam basin is mainly found in the middle-deep reservoirs of Tertiary,where the types of reservoir space generally include remained primary intergranular pore,secondary solution pore and fracture. These types may form five combinations of reservoir spaces. The favorable reservoir spaces cover secondary solution pore and fracture. The remained primary intergranular pores are normally undeveloped due to sedimentary environment,compaction,cemented fill and diagenesis...