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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2014  >  36(4): 479-486
Diao Fan, Jin Fengming, Hao Fang, Sun Yehua, Zou Huayao, Wang Yuanjie, Zhang Jinfeng, Cao Yijun. Palaeolake environment and organic matter enrichment mechanism of Paleogene Shahejie Formation in Langgu Sag[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(4): 479-486. doi: 10.11781/sysydz201404479
Citation: Diao Fan, Jin Fengming, Hao Fang, Sun Yehua, Zou Huayao, Wang Yuanjie, Zhang Jinfeng, Cao Yijun. Palaeolake environment and organic matter enrichment mechanism of Paleogene Shahejie Formation in Langgu Sag[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(4): 479-486. doi: 10.11781/sysydz201404479
shu

Palaeolake environment and organic matter enrichment mechanism of Paleogene Shahejie Formation in Langgu Sag

doi: 10.11781/sysydz201404479
  • 1.

    College of Geosciences, China University of Petroleum, Beijing 102249, China

  • 2. Exploration and Development Research Institute, PetroChina Huabei Oilfield Company, Renqiu, Hebei 062552, China

  • 3. China University of Geosciences, Wuhan, Hubei 430074, China

  • Received Date: 2014-01-03
  • Rev Recd Date: 2014-06-05
  • Publish Date: 2014-07-28
    Abstract
  • According to the analyses of element geochemistry, organic geochemistry and isotope geochemistry of mudstone samples from the 4th member (Es4) and the lower subsection of the 3rd member (Es3) of the Shahejie Formation in the Langgu Sag, combined with the characteristics of lake evolution and climate change, it was discussed in this paper the changes of salinity, redox condition and productivity as well as the enrichment mechanisms of organic matter. During the formation stage (Es4), the lake was deposited in an inactive tectonic activity with arid climate, brackish water, stable water column stratification, water bottom anoxia and lower enrichment of organic matter. When the lake developed to the peak stage (the lower subsection of Es3), the basin subsided strongly with humid climate, fresh water and weak reducing environment in the bottom water. The productivity of surface water was high triggered by a great quantity of nutrients inflowed by direct runoff. The enrichment of organic matter in lacustrine sedimentation was controlled by the productivity and redox conditions during different lake evolution stages. In Es4, the enrichment of organic matter was mainly controlled by the anoxic environment in the bottom water, while in the lower subsection of Es3, it was closely related to the high productivity of surface water.

     

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