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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(1): 91-98
Cheng Qiuquan, Yang Ruofei, Hu Guang, Fu Xiugen, Cao Jian. Bio-precursors of Cretaceous black shales in the Qiangtang Basin, Tibet[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(1): 91-98. doi: 10.11781/sysydz201601091
Citation: Cheng Qiuquan, Yang Ruofei, Hu Guang, Fu Xiugen, Cao Jian. Bio-precursors of Cretaceous black shales in the Qiangtang Basin, Tibet[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(1): 91-98. doi: 10.11781/sysydz201601091
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Bio-precursors of Cretaceous black shales in the Qiangtang Basin, Tibet

doi: 10.11781/sysydz201601091
  • 1.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

  • 2. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China

  • 3. School of Earth Sciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 4. Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu, Sichuan 610081, China

  • Received Date: 2015-03-18
  • Rev Recd Date: 2015-12-08
  • Publish Date: 2016-01-28
    Abstract
  • A new sequence of hydrocarbon source rock has been discovered recently in the Qiangtang Basin, Tibet, i.e., the Cretaceous black shales. We investigated the bio-precursors of the shales by an integrated method of organic petrology and geochemistry to improve the understanding of their resource potential. Results showed that the bio-precursors of the shales can be classified into four types in general based on their shapes, sizes, accumulation forms and fluorescence. They include marine benthic algae and zooplankton, bacteria, phytoplankton and terrestrial higher plants in decreasing order of abundance. Benthic algae are the dominant precursors. Similar to source rocks of the same type worldwide, these benthic algae dominant source rocks have high organic matter abundance (TOC>2.0%), reaching the level of good quality and belonging to organic matter type Ⅱ2, indicating that they were deposited in a marine environment. Combined with the regional thermal evolution of the shales, we deduced that the black shales have a good hydrocarbon resource potential and are likely to produce dominantly gas. They may comprise a good exploration target and merit further geological research.

     

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