【摘要】 冷湖七号—南八仙地区是柴达木盆地北缘主要的含油气区带,南八仙地区含油气层系多,从基岩到浅层均有油气发现,而冷湖七号地区目前仅在古近系中获得工业气流。利用地震资料解释、构造演化史恢复及含油气性分析等方法,对该地区的构造特征进行对比研究。结果认为:冷湖七号地区和南八仙地区均发育深、浅2套构造样式;但南八仙为古隆起背景下的早期构造,其深层挤压隆升构造和浅层滑脱构造均易形成油气富集区,而冷湖七号古构造背景不明显,其构造高点在深、浅层发生偏移,认为深层背斜或断背斜圈闭更有利于油气成藏。基于上述构造特征及成藏差异性研究,提出了冷湖七号基岩天然气勘探的新方向,拓宽了该区油气勘探领域,对该区今后的油气勘探具有一定的指导意义。更多还原

【Abstract】 The Lenghu 7—Nanbaxian area is the main hydrocarbon zone on the north margin of the Qaidam Basin.There are many hydrocarbon-bearing series of strata in the Nanbaxian area,and oil and gas are found from the basement to the shallow layer,while the industrial gas flow is only obtained from the Paleogene in the Lenghu 7 area up to now. The methods like seismic data interpretation,tectonic evolution history restoration and hydrocarbon bearing property analysis were used to compare and study the tectonic features of the area. The study results show that deep and shallow tectonic styles are developed in the Lenghu 7 and Nanbaxian areas; however,the Nanbaxian area is an early structure on the background of paleouplift,and the deep compressional uplift structure and shallow detachment structure are easy to form oil and gas enriched areas,while the Lenghu 7 area does not have an obvious palaeotectonic setting,the structural high shifts in both deep and shallow layers,and the deep anticlinal or faulted anticlinal trap is believed to be more favorable for hydrocarbon accumulation. Based on the study of the tectonic feature and hydrocarbon accumulation difference,a new direction of natural gas exploration in Lenghu 7 basement is put forward,which widens the petroleum exploration realm and is very instructive for the future petroleum exploration in the area.更多还原