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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(6): 834-841
Dong Junyan, Chen Shijia, Zou Xianli, Yao Jingli, Li Yong, Su Kaiming. Distribution and origin of rearranged hopanes in Yanchang Formation, Wuqi-Gaoqiao area, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 834-841. doi: 10.11781/sysydz201706834
Citation: Dong Junyan, Chen Shijia, Zou Xianli, Yao Jingli, Li Yong, Su Kaiming. Distribution and origin of rearranged hopanes in Yanchang Formation, Wuqi-Gaoqiao area, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 834-841. doi: 10.11781/sysydz201706834
shu

Distribution and origin of rearranged hopanes in Yanchang Formation, Wuqi-Gaoqiao area, Ordos Basin

doi: 10.11781/sysydz201706834
  • 1.

    School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 2. Sichuan Key Laboratory of Natural Gas Geology, Chengdu, Sichuan 610500, China

  • 3. China University of Petroleum(Beijing) at Karamay, Karamay, Xinjiang 834000, China

  • 4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

  • Received Date: 2017-05-22
  • Rev Recd Date: 2017-09-25
  • Publish Date: 2017-11-28
    Abstract
  • A high abundance of rearranged hopanes has been detected from source rocks of the Triassic Chang 7,8,9 formations in the Wuqi-Gaoqiao area of the central Ordos Basin.We classified 3 types of source rocks and separately analyzed their genesis compared with the characteristics of biomarkers from different formations.The gas chromatography-mass spectrometry (GC-MS) analyses indicated that there were three series of rearranged hopanes in the source rocks,which are 17α(H)-diahopanes,early-eluting rearranged hopanes and 18α(H)-neohopanes.Moreover,early-eluting rearranged hopanes are commonly associated with high abundant 17α(H)-diahopanes and 18α(H)-neohopanes,meanwhile,rearranged drimanes and rearranged steranes are detected in source rocks which also retain high amounts of those three types of rearranged hopanes.This indicates that the genesis and alteration of rearranged compounds are probably affected by similar processes.Many geochemistry parameters showed that, the formation of rearranged hopanes could be closely related with higher plant source materials.Sub-oxic,freshwater and clay-rich depositional environment are beneficial for forming a significant proportion of rearranged hopanes. Higher thermal evolution favors rearranged hopanes;however,the content differences of hopanes affected by different pyrolysis rates at high maturity must be considered.

     

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