Sedimentary model of shallow water delta and beach bar in the Member 1 of Paleogene Funing Formation in Gaoyou sag, Subei Basin
Ji Youliang1, Lu Huan2, Liu Yurui3
1 College of Geosciences, China University of Petroleum(Beijing), Beijing102249
2 Tianjin Branch of China National Offshore Oil Corp. , Tianjin300452
3 Geological Research Institute, Jiangsu Oilfield Branch, Sinopec, Yangzhou225000, Jiangsu
Based on the core observation and thin section identification of 38 wells drilled through the Member 1 of Paleogene Funing Formation in Gaoyou sag, Subei Basin, it was discovered that the sedimentary facies was characterized by shallow delta and beach bar sedimentary features, which was different from that of previous study. The shallow delta facies could be divided into delta plain and delta front sub-facies. The former subfacies, contained distributary channel, mouth bar and subaqueous natural levee and the latter one included subaqueous distributary channel, subaqueous natural levee, bay between distributary channels and river mouth bar. In the period of lake level fluctuation, the distributary channels of shallow delta|stretched into the center of the lake basin to form several superimposed lobes. While adjacent to the edge of shallow delta, beach bars were distributed in ribbon shape along lacustrine shoreline by the transformation of lake wave and coastal current. Thus, a new type of sedimentary model named shallow delta and beach bar depositional model was set up.
Ji Youliang,Lu Huan,Liu Yurui. Sedimentary model of shallow water delta and beach bar in the Member 1 of Paleogene Funing Formation in Gaoyou sag, Subei Basin[J]. JOPC, 2013, 15(5): 729-740.
