Sedimentary Process and Reservoir Characteristics of Turbidite Fan of Cretaceous Yageliemu Formation in Kuqa Foreland Basin

Key words: 
•   /
• Kuqa depression /
• foreland basin /
• turbidite fan /
• Yageliemu Formation /
• sedimentary process /
• reservoir characteristics

Abstract: Sedimentary process, Xrays fluorescence analysis of sandstone and mudstone, and reservoir characteristics analysing were used in measuring the strata of Kapushaliang outcrop in Kuqa foreland basin. An evolution of sedimentary process is obviously in dry climate. Intermittent braided river deposits in Upper Jurassic Kalazha Formation. Turbidite fans develope in lacustrine deep water of Lower Yageliemu Formation, and shallow water lake mudstone and lacustrine bars deposit in Upper Yageliemu Formation. The dry and cold paleoclimate occurs in early period of Yageliemu Formation. At the same time, some sedimentary structures for examples the groove cast, flute cast, gravity markers, and Bouma sequences deposit in turbidite fan channels. The black lacustrine mudstone developes in the upper Yageliemu Formation, the paleoclimate changes from warm to cold. The quartz percentage of turbidite fan channel is higher than lacustrine bar. The value of tuibidite fan channel is from 62% to 70%, and the value of lacustrine bar is from 55% to 58%. There are some solution opening in sandstones of tuibidite fan channel and lacustrine bar, but the solution value of lacustrine bar is higher than turbidite fan channel. The discovery of turbidite fan in Kapushaliang outcrop of Yageliemu Formation is important for foreland basin research in Kuqa, and instructs lacustrine deep water region development in the western Kuqa depression.