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- Title
Compositional evolution and gcochcmical characteristics of diamondoids during oil cracking.
- Authors
Chen Yan-yan; Hu Su-yun; Li Jianz-hong; Wang Tong-shan; Tao Xiao-wan
- Abstract
This study employed a gold tube-autoclave reactor system to investigate the thermal cracking of crude oil sample from Well Tazhong 169 and the geochemical evolution of carbon isotope and diamondoids during oil cracking. Our results indicated that oil cracking is a process accompanied by the decline of ali-phatics and raise aromatics, also a process featuring the large molecular hydrocarbons transformed into small molecular hydrocarbons and pyrobiturnen.The evolution of diamondoids can be divided into three stages,i.e., stable stage(Easy%Ro<l.5%), formation stage(Easy%Ro = 1.5%-2.8%) and diminution stage (Ensy%Ro > 2.8%).A quantitative kinetic model of compositional evolution of pyrolysates has been established for each stage.The models are instructive for the gas composition characteristics prediction and resource evaluation of ancient reservoirs.The present study improves our understanding on the geochemical characteristics associated with oil cracking processes.and the findings provide solid supports for the evaluation of the thermal stability and the prediction of preservation deadline of oil in Tazhong area in the Taritn Basin.
- Subjects
GEOCHEMISTRY; DIAMONDOIDS; CARBON isotopes; AROMATIC compounds; GEOLOGICAL basins
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 1, p114
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.l672-1926.2017.09.017