鄂尔多斯盆地延长组三角洲沉积环境演化

Evolution of delta environment in Yanchang Formation,Late Triassic of Ordos Basin

鄂尔多斯盆地上三叠统延长组是我国重要的含油气层系,极具勘探潜力。基于前人的研究基础,结合野外露头、钻井岩心和测井资料的分析,探究鄂尔多斯盆地晚三叠世延长组三角洲沉积环境,东北部和西北部以曲流河三角洲为主,西南部以辫状河三角洲为主,湖泊分布在盆地中部偏东南,从长1期到长10期经历了完整的湖泊演化过程。上述研究以期为油气勘探提供基础地质依据。

The Yanchang formation,Upper Triassic in Ordos Basin is an important oil-bearing series in China with great exploration potential.Based on the geological background,combing with the analysis of field outcrops,drilling cores and well logging data,the delta environment of the Upper Triassic Yanchang formation in Ordos Basin was deeply analyzed,The north and northwest are mainly meandering river deltas,the southwest is mainly braided river deltas,and the lakes are distributed in the middle and southeast of the basin.It represents a complete lake evolution process from Chang 1 to Chang 10.The above results will be valuable for the future exploration and development of petroleum in the Ordos Basin.