Abstract: Tidal flat deposit formed under dry and hot climate occurs in Carboniferous shale segment of Mangal sag in Tarim basin, in which Hade son area appears to be inter-tidal flat deposit for its particular old uplift setting that was submerged or come out depending on the high tide or low tide. During the super-tide with enriched sandstone, sand sheet with thin deposit, large area and better connection was deposited on the old uplift. Under the winnowed and sieve processes, geometry, thickness and physical property of the sand sheet were all changed. It is believed that the sand sheet is a high quality of reservoir, and may contain enriched crude oil.

Key words: Tarim basin, Mangal sag, Carboniferous, tidal flat, tide, sand sheet