Abstract
The Dainan Formation in the Gaoyou Depression is a complete sedimentary cycle. It consists of lacustrine facies in an onlapping style at the lower partand fluvial facies at the upper part in a filling pattern, showing a evolution-ary process from lacustrine to fluvial facies. The various sedimentary systems as Majiazui-Lianmengzhuang long-axialdelta, Zhenwu - Caozhuang fan-delta and Zheduo delta are respectively inthe west, south steep slope and north gentle slope of the depression. Amongthem, the fan delta and long-axial delta systems are favourable for hydro-carbon accumulation.
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