Comparison of the sedimentary characteristics of the Donghe sandstone section between the Tabei and Tazhong areas, Tarim basin

Abstract：The Donghe sandstone is a marine petroleum-bearing reservoir that was first found in China. An integrated study of the geological and geophysical data of the Tarim basin show that the Donghe sandstone in Tabei and Taｚｈong has high compositional and textural maturities, typical grain-size parameters of the marine environment and trace element association and distinct littoral-neritic sedimentary structures. However, there are differences in details of sedimentary characteristics and sedimentary environment in the Donghe sandstone. The Donghe sandstone in the Tabei area was deposited in the littoral and barrier island－lagoonal environment, while the sandstone in the Tazhong area in the estuary－littoral environment. Finally, this paper elucidates the vertical sequence ｏｆ the sedimentary characteristics and distribution of sedimentary facies of the Donghe sandstone ｓｅｃｔｉｏｎ in the Tabei and Tazhong areas.