塔东北孔雀河地区油气成藏过程重建

Reconstruction of the oil and gas accumulation process in the Kongquehe area of northeast Tarim Basin,China

塔里木盆地东北的孔雀河地区在区域构造上横跨满加尔坳陷和孔雀河斜坡两个二级构造单元,地质条件比较复杂,长期的构造演化、多期的构造运动及生排烃史造成油气勘探难度较大,油气分布规律很不清晰。作者从孔雀1井、英南2井、龙口1井、满东1井等含油气构造的构造演化出发,分析了成藏演化过程,总结了孔雀河地区油气成藏演化模式,认为主要成藏期为喜马拉雅期。寒武系-下奥陶统烃源岩处于过成熟阶段;侏罗系烃源岩成熟度低,分布局限,贡献不大。孔雀河地区油气源主要为早期古油藏裂解气。

The Kongquehe region located in the northeast of the Tarim Basin crosses two sub-tectonic units, that is, Manjiaer depression and Kongquehe slope. Becuase of its complicated geological conditions, a long tectonic evolutionary history, muhiphase tectonic movements and hydrocarbon generation ＆ expulsion histories, it is difficult to explore petroleum and to identify the law of oil and gas distribution. By studying hydrocarbon tectonic evolution of Well Kongque 1, Well Nanying 2, Well Longkou 1, and Well Mandong 1, the authors analyze the evolutionary process of hydrocarbon accumulation, summarize the pattern of the oil and gas accumulation evolutionary model in the Kongquehe area, and concludes that the main hydrocarbon accumulation was in Himalayan period. From the Cambrian to Lower Ordovician, the hydrocarbon rock belonged to the over-mature stage; the hydrocarbon rock was the low-mature stage during Jurassic, its distribution was limited, it had not too much contribution to form oil and gas pools. The hydrocarbon source mainly came from the early paleo-oil pools pyrolysis gas in the Kongquehe area.