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。

Based on the research of Lenghu No.3- 5 structural belt, it is concluded that hydrocarbon accumulation of this structural belt is mainly affected by the following factors: ① the residual Lower Jurassic located in the western Lenghu area provides material foundation for the hydrocarbon accumulation of this structural belt; ② the Lower Jurassic which acts as the hydrocarbon source rocks was buried properly, and there exists an ideal matching of structure configuration and large scale hydrocarbon generation stage; ③ tectonic evolution of the residual hydrocarbon-generation depression makes Lenghu structural belt become the advantageous structural belt; ④ the tectonic setting of Lenghu structural belt has the characteristics of higher in north and lower in south, which results in that the Lenghu No. 3- 4 structural belt is better than Lenghu No. 5 structural belt in reservoir formation. It is indicated that Lenghu No. 3- 5 structural belt is still the advantageous direction of oil and gas exploration in this area.