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Compositional evolution and geochemical characteristics of diamondoids  during oil cracking

Chen Yan-yan,Hu Su-yun,Li Jian-zhong,Wang Tong-shan,Tao Xiao-wan   

  1. Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:2017-07-01 Revised:2017-09-28 Online:2018-01-10 Published:2018-01-10

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 aliphatics and raise aromatics,also a process featuring the large molecular hydrocarbons transformed into small molecular hydrocarbons and pyrobitumen.The evolution of diamondoids can be divided into three stages,i.e.,stable stage(Easy%RO<1.5%),formation stage(Easy%RO =1.5%-2.8%) and diminution stage(Easy%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 Tarim Basin.

Key words: Tarim Basin, Crude oil, Thermal cracking, Diamondoids

CLC Number: 

  • TE122.1+13

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