乌尔逊凹陷油气成藏与分布控制因素分析

通过对乌尔逊凹陷构造、沉积、源岩、盖层、断层、运移路径和圈闭条件与油气藏的叠合的研究 ,分析了乌尔逊凹陷油气成藏与分布的控制因素 ,认为构造反转带是油气成藏有利构造区 ;扇三角洲和浊积扇是油气成藏的有利环境 ;盖源空间质量匹配控制着油气的空间分布 ;断裂控制着油气的运聚成藏及分布层位 ;油气运移路径的汇聚区位于南屯组烃灶内或其附近 ,有利于乌尔逊凹陷油气的运聚成藏 .因此可以得出结论 :源岩、盖层和断裂及其时空匹配关系是乌尔逊凹陷油气成藏与分布的主控因素

Analysis to factors controlling formation and distributionof oil or gas reservoirs in Wuerxun depression

To study the controlling factors of hydrocarbon accumulation and distribution in Wuerxun Sag, the relationships are analyzed between the conditions of structures, sedimentations, source rocks, cap rocks, faults, oil and gas migration passages and traps and hydrocarbon accumulation. It is held that the transformation zones of structures are the favorable areas to the accumulation of oil and gas; fan-delta and turbidite fan are the favorable facies to the accumulation of oil and gas; the space matching relation between cap rocks and source rocks controls the oil and gas distribution in space; the faults control the horizons of accumulation and distribution of oil and gas; the converging areas of oil and gas migration passages are within hydrocarbon producing region in Nantun Formation or nearby it, which is favorable to the accumulation of oil and gas. Therefore, it is concluded that source rocks, cap rocks, faults and their time and space matching relations are the main controlling factors of hydrocarbon accumulation and distribution in Wuerxun Sag.