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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2011  >  33(4): 428-436
Guo Liguo, Xiao Xianming, Tian Hui. Laboratory studies of differences between oil-derived and kerogen maturation gases[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(4): 428-436. doi: 10.11781/sysydz201104428
Citation: Guo Liguo, Xiao Xianming, Tian Hui. Laboratory studies of differences between oil-derived and kerogen maturation gases[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(4): 428-436. doi: 10.11781/sysydz201104428
shu

Laboratory studies of differences between oil-derived and kerogen maturation gases

doi: 10.11781/sysydz201104428
  • 1.

    Department of Geosciences, Geosciences and Engineering Institute, Nanjing University, Nanjing, Jiangsu 210093, China

  • 2. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

  • 3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

  • Received Date: 2010-12-09
  • Rev Recd Date: 2011-06-13
  • Publish Date: 2011-08-28
    Abstract
  • An immature type-I mudstone collected from the third section of the Tertiary Shahejie Formation (Es33) in the Dongying Sag of the Bohai Bay Basin was studied with laboratory experiments.Products were extracted,fractionated into chemical groups,and re-mixed to obtain synthetic oil (s-oil) with a group composition similar to reservoir oil and a pseudo-kerogen (p-kerogen) composed of 83% kerogen and 17% residual soluble organic matter.The two samples were pyrolyzed in sealed gold tubes under constant pressure and non-isothermal heating conditions and the generated gases were analyzed.The two gases are quite different in their chemical and isotopic composition.Compared with the gas derived from p-kerogen,the s-oil-derived gas is rich in C2-C5 hydrocarbons during the early cracking stages and C1-C3 hydrocarbons are depleted in δ13C throughout the cracking stages.The carbon isotopic ratio differences between the two gases can reach 10‰ (δ13 C1),14‰ (δ13 C2),and 9‰ (δ13 C3).The δ13C2-δ13C3 value of the s-oil gas is much more sensitive to thermal stress than that of the p-kerogen gas and the plots of (δ13C2-δ13C3) versus δ13 C1 and (δ13C2-δ13C3) versus ln(C2/C3) are effective in identifying the two gas types.These results provide a guide to differentiate gases derived from oil cracking from those derived from kerogen maturation.

     

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