Abstract: Zanazor condensate field is the first big oil-gas field in Middle-Asia area among its foreign research projects contracted by PetroChina Xinjiang 0il. According to a lot of data from exploratory and production well logs, core descriptions as well as core lab analyses, an extensive correlation is conducted among Zanazor field, Darwatz basin and Fergana basin in this area, on which more reasonable classifica-tion is performed of Carboniferous, the major petroliferous sequence. Hence, previous boundary between Upper Carboniferous and Lower Per-mian is modified in this paper, confirming three litho-pseudoconformities existed within the Carboniferous and other abrasion surfaces. Fur-thermore,the sequence is subdivided into 5 sections of reservoirs which include 19 layers in terms of sedimentary cycle mechanism analysis; the fine depositional facies is studied firstly followed by definition of the primary facies as neritic open tableland facies and restricted platform facies. These results provide solid geologic basis for development of Zanazor field.

Key words: Carboniferous, carbonate rock, pseudoconformity, fossil, sedimentary cycle, depositional facies, Zanazor field