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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2008  >  30(4): 375-381
Li Hongtao, Wu Shixiang, Cai Chunfang, Luo Xiaorong, Bao Rima. GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF INCLUSIONS AND ADSORBED HYDROCARBONS IN YAOJIA FORMATION SANDSTONES IN QIANJIADIAN AREA, THE KAILU BASIN[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2008, 30(4): 375-381. doi: 10.11781/sysydz200804375
Citation: Li Hongtao, Wu Shixiang, Cai Chunfang, Luo Xiaorong, Bao Rima. GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF INCLUSIONS AND ADSORBED HYDROCARBONS IN YAOJIA FORMATION SANDSTONES IN QIANJIADIAN AREA, THE KAILU BASIN[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2008, 30(4): 375-381. doi: 10.11781/sysydz200804375
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GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF INCLUSIONS AND ADSORBED HYDROCARBONS IN YAOJIA FORMATION SANDSTONES IN QIANJIADIAN AREA, THE KAILU BASIN

doi: 10.11781/sysydz200804375
  • 1.

    Exploration & Production Research Institute, SINOPEC, Beijing 100083, China

  • 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

  • 3. China University of Petroleum, Beijing 102249, China

  • Received Date: 2007-08-13
  • Rev Recd Date: 2008-07-29
  • Publish Date: 2008-07-28
    Abstract
  • Inclusion hydrocarbons and adsorbed hydrocarbons were observed under microscope and UV fluorescence in Lower Cretaceous Yaojia Formation sandstones in Qianjiadian area,the Kailu Basin.Subsequently,these sandstone samples were washed,crushed,extracted for hydrocarbons and analyzed by GC and GC-MS.The results showed that ratios of C29 ααα sterane 20S/(20S+20R) and C31 αβ hopane 22S/(22S+22R) of the hydrocarbons were closed to respective equilibrium values,suggesting that the hydrocarbons were marginally mature to mature.Among C27,C28 and C29 ααα20R steranes,C27>C2829.Ratios of C25/C26 tricyclic terpane and regular steranes/17αC29-33 hopanes were relatively low.The values together with those of gammacerane index and homohopane index consistently indicated that the inclusion oils and adsorbed hydrocarbons were derived from humic-sapropel type organic matter under poor reducing freshwater to semi-saline environment.The features were similar to those of organic matter extracted from the Upper Jurassic Jiufotang Formation source rocks in the Kailu Basin.Thus,it could be concluded that the inclusion oils were mainly derived from the Upper Jurassic Jiufotang Formation source rocks of lacustrine facies.

     

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