南祁连盆地木里凹陷侏罗系烃源岩沉积环境与生烃潜力

The evaluation of the hydrocarbon generation potential of source rocks in Muli depression of southern Qilian basin

南祁连盆地木里凹陷侏罗系发育多层暗色泥岩,从有机质丰度、有机质类型、有机质成熟度等3方面对DK-3井烃源岩进行评价表明,其有机质丰度相对较高,有机质类型为Ⅱ1（腐殖-腐泥型）～Ⅱ2（腐泥-腐殖型）型,烃源岩整体处于成熟热演化阶段;烃源岩生烃潜力最高的层段为深度140～350m内的黑色湖相泥岩,其有机质丰度高,类型好,且已达到成熟阶段;其次为深度630～720m内的灰色泥岩夹层;其他层段烃源岩有机质丰度整体偏低,生烃潜力有限.

Multilayer dark mudstone is developed in Jurassic strata of the Muli depression within southern Qilian basin. The evaluation of the source rock of Well DK- 3 in the aspects of organic matter abundance,organic matter type, and organic matter maturity indicates that organic matter is abundant, organic matter type is Ⅱ1- Ⅱ2, and organic matter maturity is high. The highest hydrocarbon generation potential layer of the source rock is developed in the depth of 140-350 m, which is black deep lacustrine facies mudstone. The relatively high hydrocarbon generation potential layer is developed in the depth of 630-720 m, which is gray mudstone interlayer from the meandering river. Other layers are low in organic matter abundance and have low hydrocarbon generation potential.