The Characters of Sedimentary Facies in Chang 81 Oil Layers of LUO 1 Wells,Jiyuan Area

Jiyuan region located in the mid-western of northern slopes,Ordos Basin.Compared to other layers,the Chang 81 oil layer is belong to new formations.Despite accumulated data and research of many years,previous scholars still have considerable differences and the research base is relatively weak.By means of cores,thin section,well logs,etc,comprehensive analysis,combined with previous research results,the sedimentary characteristics of study area is summarized,which determine that Chang 81 oil layers of Upper Triassic belong to shallow-water delta system and the types of sedimentary facies are including delta front and delta plain.Also,through discussing the sedimentary characteristics and the profile structure,the plane distribution of sedimentary facies characteristics is predicted.