(1. Northwest Exploration Research Center of China Petrochemical Petroleum Exploration and Development Research Institute, Beijing100083;

China Youshi University (Beijing), Beijing 102249)

Shun 7 well is located at the northwest end of I slope break zone in Tazhong, and condensate gas reservoir is drilled in Yingshan Formation. A comprehensive study on the composition, carbon isotope, adamantane and biological standard compounds of natural gas and crude oil in Well Shun 7 shows that the carbon isotope of natural gas in Well Shun 7 shows a positive sequence distribution, δ 13c2.

Condensate gas reservoir; Crude oil cracking; Adamantane; Shun 7 tower

Discussion on geochemistry and the cause of condensate

Shun 7 Well in Tazhong Area, Northwest China

Li Jingjing 1, 2, Wang Yi 1, Ma Anlai 1, Li Huili 1, Zhang Weibiao 1

(1. China Petrochemical Exploration and Development Research Institute, Beijing 100083,

China; 2. China Shiyou University, Beijing 102249, China)

Shun7 well is the condensate oil and natural gas of Yingshan Formation of Middle and Lower Ordovician in Tazhong No.1 fault slope break zone in Tarim Basin. The carbon isotope distribution of natural gas components shows normal carbon isotope sequence (i.e. δ 13c 1