Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 671-680.doi: 10.13278/j.cnki.jjuese.201603105

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Characteristics of Oil Shale of Oligocene Dingqinghu Formation and Its Geological Significance, Lunpola Basin

Du Baiwei1, Xie Shangke1, Dong Yu2, Peng Qinghua1, Zheng Bo1   

  1. 1. Chengdu Center of China Geological Survey, Chengdu 610081, China;
    2. No. 6 Geological Brigade of the Geological Prospecting Bureau of Tibet, Lhasa 851400, China
  • Received:2015-10-11 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by National Science and Technology Major Project(2011ZX05004001-006) and the Special Geological Survey Evaluation of China Geological Survey(12120115000301)

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Abstract:

Oil shale of Oligocene Dingqinghu Formation orientating in NW-SE with about 50 km in length is discontinuously distributed. There are 18 to 22 oil shale layers ranging from 0.70 m to 2.00 m in thickness, of which the thinnest layer is 0.10 m and the thickest layer is 8.81 m. The results of industrial analysis show that Lunpola oil shale is a kind of high content of ash, medium to low oil yield and low calorific value. Organic carbon content of oil shale ranges from 2.40% to 20.23% with an average of 7.38%, indicating a relatively high abundance. Microscopic observations indicate that organic matter of oil shale is a kind of sapropel type kerogen. Vitrinite reflectance of kerogen range from 0.43% to 0.71% with an average of 0.52%, indicating that organic matter of oil shale underwent a stage of immature to low maturation. Abundant biomarkers, including n-alkanes, isoprenoid, terpanes and steranes from oil shale have been detected by GC and GC-MS. GC-MS characteristics of saturated hydrocarbon show that organic matter is characterized by aquatic phytoplankton. The characteristics of biomarkers and field observation reveal that oil shale forms in low-salinity anoxic semideep-deep lake environment. Phytoplankton and algae in the lake provide main origin of organic matters for oil shale formation, and stable structure and anoxic environment are beneficial for the conservation of organic matters.

Key words: oil shale, biomarkers, geological significance, Lunpola basin, Dingqinghu Formation

CLC Number: 

  • P618.12

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