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GAO Li, WANG Zongxiu, LIANG Mingliang, ZHANG Linyan, LI Huijun, LI Chunlin, GAO Wanli. 2019. Material composition and hydrocarbon potential of the shale of WufengLongmaxi Formation in northwestern Hunan[J]. Geology in China, 46(2): 407-418. doi: 10.12029/gc20190217
Citation: GAO Li, WANG Zongxiu, LIANG Mingliang, ZHANG Linyan, LI Huijun, LI Chunlin, GAO Wanli. 2019. Material composition and hydrocarbon potential of the shale of WufengLongmaxi Formation in northwestern Hunan[J]. Geology in China, 46(2): 407-418. doi: 10.12029/gc20190217
shu

Material composition and hydrocarbon potential of the shale of WufengLongmaxi Formation in northwestern Hunan

  • Institute of Geomechaniscs/Key Lab of Shale Oil and Gas Geological survey, Chinese Academy of Geological Sciences, Beijing 100081, China

    • Fund Project: Supported by Geological Survey Program of China Geological Survey (No. 121201104000150006)
More Information
  • Author Bio: GAO Li, female, born in 1988, doctor candidate, majors in the study of structure geology; E- mail: gaoli2015cags@163.com
  • Corresponding author: WANG Zongxiu, male, born in 1959, professor, mainly engages in the study of structural geology; E-mail: wangzongxiu@soho.com 
Received Date:  06 March 2017
Revised Date:  30 September 2017
Publish Date:  25 April 2019
    Abstract

  • In order to investigate source material and sedimentary environment of Lower Paleozoic Wufeng-Longmaxi Formations shale in northwestern Hunan, the authors studied the organic matters, biomarkers and mineral composition. The results show that they have the following characteristics:No odd-even carbon dominance appears; N-alkanes mostly have bimodal performance (C18/C25), and the ratios of ∑C21-/∑C22+ are 0.45-1.11, indicating the dominant role of heavy hydrocarbon components; the average ratios of Pr/Ph vary from 0.27 to 0.44, showing reduction conditions. The tricyclic terpane values of C21, C23 and C24 show inverted Vshaped distribution, and the ratios of Ts/Tm are between 0.39 and 0.66. The related content of C27 sterane is slightly higher than that of C29 sterane. Based on these features of biomarker, it is believed that the shales of Wufeng-Longmaxi Formation were formed in a reduction environment in shallow water in the Early Paleozoic, with high degree of thermal evolution of organic matter, and the main sources were bacteria, algae and other aquatic organisms. The vitrinite reflectance equivalent values vary from 2.57% to 3.01%, suggesting that all of the shale samples have reached the mature stage. The mineral compositions of the shale samples indicate that quartz and clay minerals dominate the mineral composition, indicating a good brittleness index and adsorption capability. It is concluded that exist favorable geological conditions for shale gas enrichment in the marine shale in the present study area:organic-rich intervals, moderate thermal evolution, good brittleness index and adsorption capability. The results obtained by the authors have laid an important basis for preference of shale gas exploration target area and further gas exploration in this area.

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