BN地区沙四下红层成藏条件及成藏规律研究

The study of the oil-gas accumulation condition and law of redbeds of lower Member of Es4 in BN area

沙四下红层作为BN地区勘探的新层系,勘探程度较低。结合已钻井的实际情况,对本区红层成藏条件及成藏规律综合研究后发现,其主要受储集层、烃源岩、输导层、盖层等要素的影响,其中储层和生油岩是红层成藏的基础条件,油气运移通道是红层成藏的关键条件,地层压力、油源断层与储层和烃源岩的配置关系是红层油气藏成藏的主控因素。

The redbeds of lower member of Es4, as a new layer explored in BN area, is at a relatively low degree of prospecting. The oil-gas accumulation condition and law of the redbeds is studied combined with the drilled wells, the results show that it is controlled by reservoir, source rock, carrier beds and capping bed, in which the reservoir bed and source rock are the basic condition, the migration pathway is the key condition, the relations of formation pressure, petroleum source fault, reservoir and the source rocks are the main controlling factors of the accumulation of redbeds.