断裂对乌尔逊凹陷油气成藏与分布的控制作用

分析了乌尔逊凹陷断裂特征及其与油气藏形成与分布的关系。对断裂在鸟尔逊凹陷油气藏形成与分布中的作用进行了深入研究,认为深源无机CO2气藏分布在该凹陷深大断裂附近;晚期和长期继承性断裂可作为凹陷南屯组烃源岩油气的运移通道;油气在平面上主要沿苏仁诺尔断裂分布;大一段较好的封闭性促使了乌尔逊凹陷油气藏主要形成在其下伏的南二段;与断层有关的圈闭是该凹陷的主要封闭类型。研究结果表明,断裂对乌尔逊凹陷油气成藏与分布起到了控制作用。

Controlling role of faults to oil-gas reservoir forming and distribution in Wuerxun depression

Faults characteristics of Wuerxun depression and their relation with formation and distribution of oil-gas reservoirs were analyzed. The role of faults to oil-gas reservoir forming and distribution in Wuerxun depression was studied thoroughly. Inorganic carbon dioxide gas with deep source was distributed near deep and big faults. Only the inherited faults formed at later period become the oil-gas migration passages of the source rocks in Nantun formation of the depression. Oil -gas plane distribution is mainly along Surennuoer fault. The good sealing of the faults in Da 1 member makes oil-gas reservoir formed in its underlying Nan 2 member. Traps related to faults are the main types of traps in Wuerxun depression. These results indicate that faults play an important role in controlling the formation and distribution of oil and gas reservoirs in Wuerxun depression.