Abstract:

Reef-beach bodies of Permo-Carboniferous are well developed in western Tarim Basin, in which there are good oil and gas potentials. Based on the Kangkelin Formation of Subashen outcrop section in Keping country and integrated with Heshenlapu and Sishichang ones, the characteristics and types of reef-beach bodies are discussed, the lithology and lithofacies distribution are studied and the depositional model of carbonate rocks of PermoCarboniferous in western Tarim Basin is established. It is suggested:(1) As primary reef rocks,the reef limestone, which well developed in the Kangkelin Formation of Subashen outcrop section in Keping country, was deposited in the environments from the margin of carbonate platform to the internal of that;(2) In western Tarim Basin, the early and late Kangkelin Age's depositional environments are different, the sea-level change and the paleogeographic condition are reflected by the transfer of the facies zones; (3) The reef-beach bodies of the Kangkelin Age are well developed and have a good spatial continuity. It should be one of the most important reservoirs in western Tarim Basin.

Key words: western Tarim Basin, Kangkelin Formation, reef-beach body, spatial distribution, depositional model