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冷湖3—5号构造带是柴北缘地区重要的含油气构造带,通过对该构造带的研究认为,其油气成藏主要受以下3个因素控制:①冷西次凹巨厚的残余下侏罗统地层为该构造带成藏提供了良好的物质基础;②冷湖地区第三纪以来下侏罗统烃源岩埋藏适中,构造与大规模生排烃期配置关系好;③残余生烃凹陷的构造演化使冷湖构造带成为最有利的构造带;④冷湖构造带北高南低的构造背景,决定了较高部位冷湖3—4号构造成藏优于较低部位冷湖5号构造。冷湖3—5构造带油源充足,生排烃和构造配置关系好,可发育构造、构造-岩性、不整合等类型油气藏,冷湖构造带仍是柴北缘扩展勘探的有利区带。
Cold Lake 3-5 tectonic belt is an important oil-bearing tectonic belt in the northern margin of Qaidam Basin. Based on the study of this tectonic belt, the hydrocarbon accumulation is mainly controlled by the following three factors: (1) The Jurassic strata provide a good material basis for the accumulation of structural belts. ② Lower Jurassic source rocks are moderately buried in the Lenghu area since the Tertiary, and have a good relationship with the configuration of large-scale hydrocarbon generation and expulsion. ③ Residual The tectonic evolution of hydrocarbon sags makes the cold lake structural belt the most favorable tectonic belt. (4) The tectonic setting of the north and south of the cold lacustrine tectonic belt determines that the structure of cold lakes 3-4 in the upper part is better than the lower part Lake No. 5 structure. Cold Lake 3-5 tectonic belt is rich in oil source, and the relationship between hydrocarbon generation and expulsion and structure and tectonics is good, and structural reservoirs of tectono-tectonic-lithology and unconformity can be developed. Cold tectonic belt is still the favorable zone for exploration expansion in northern Qaidam .