柴达木盆地红沟子鼻状构造新生代油气成藏特征

Features of Cenozoic Hydrocarbon Accumulation in Honggouzi Structure,Qaidam Basin

通过对柴达木盆地红沟子鼻状构造带区域构造背景、石油地质条件的分析,探讨了其新生代油气成藏的基本特征,认为新生代以来,红沟子鼻状构造带随阿尔金山前带广大地区共同经历了沉降、挤压、定型等多个演化阶段,形成了丰富的生储盖组合和众多圈闭,且圈闭与油气成藏的时空配置良好;红沟子鼻状构造带发育了2种类型油气藏,即深部裂缝—孔隙型油气藏和浅部孔隙型油气藏,前者主要发育于鼻状构造带东部,后者主要发育于鼻状构造带西部。

The nose structure is an important location for hydrocarbon accumulation. Based on the.analysis of its geological background and oll geological factors, the basic features of Cenozoic hydrocarbon accumulation in the Honggouzi structure is discussed. Firstly, the structure undergoes depression, extrusion and finalization in the front of the Altun Mountain since the Cenozoic, and abundant source reservoir seal assemblages which has good space-time association are formed. Secondly, the structure develops two types of oil-gas reservoirs, crack-pore type which is distributed in the east of the structure, and pore type which is distributed in the superficial layer of west structure.