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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2014  >  36(6): 736-743
Cheng Bin, Wang Tieguan, Chang Xiangchun, Yuan Yuan, Wang Ning. Geochemical characteristics and correlation of extracts from Silurian bituminous sandstones and Carboniferous oil sands in well Ha6, northern Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(6): 736-743. doi: 10.11781/sysydz201406736
Citation: Cheng Bin, Wang Tieguan, Chang Xiangchun, Yuan Yuan, Wang Ning. Geochemical characteristics and correlation of extracts from Silurian bituminous sandstones and Carboniferous oil sands in well Ha6, northern Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(6): 736-743. doi: 10.11781/sysydz201406736
shu

Geochemical characteristics and correlation of extracts from Silurian bituminous sandstones and Carboniferous oil sands in well Ha6, northern Tarim Basin

doi: 10.11781/sysydz201406736
  • 1.

    State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

  • 2. Shandong University of Science and Technology, Qingdao, Shandong 266510, China

  • Received Date: 2013-01-17
  • Rev Recd Date: 2014-09-20
  • Publish Date: 2014-11-28
    Abstract
  • Five Silurian bituminous sandstone and Carboniferous oil sand samples were collected from well Ha6 in the Halahatang Sag of the Tarim Basin, and geochemical analyses including extraction, stable carbon isotope composition, saturate fraction gas chromatography and biomarkers were performed. The δ13C (‰) values for extracts from the Silurian bituminous sandstone and the Carboniferous oil sand samples are very close. The CPI values range from 0.95 to 1.06, the OEP values from 0.94 to 1.00, the Pr/Ph values from 0.34 to 0.76, the C21/C23 tricyclic terpane values from 0.37 to 0.47, the C29/C30 hopane values from 0.91 to 0.97, the C35S/C34S hopane values from 0.91 to 1.00, the gammacerane/C30 hopane values from 0.69 to 0.79, the Ts/(Ts+Tm) values from 0.39 to 0.43. Besides, the relative concentration of C27, C28 and C29 regular steranes for extracts from all samples is significantly similar and so does the relative concentration of fluorene, dibenzofurans and dibenzothiophene. Extracts from five samples all contain 25-norhopanes and n-alkanes and acyclic isoprenoids with different abundance and the saturated fraction gas chromatograms show baseline humps called UCM, i.e., n-alkanes and acyclic isoprenoids co-exist with UCM and 25-norhopanes. Based on the above analyses, it was concluded that Silurian and Carboniferous oils were derived from same source rocks and had undergone multiple charges and different degrees of biodegradation.

     

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