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Characterization and controlling factors of pores in the Lower Cambrian Niutitang shale of the Micangshan Tectonic Zone, SW China

  • Tao TianEmail author
  • Shixin Zhou
  • Deliang Fu
  • Fu Yang
  • Jing Li
Original Paper
  • 48 Downloads

Abstract

Lower Cambrian marine shale has become a new target of shale gas resource evaluations in the complex geological region of southern China, where the Niutitang Formation is among the most important shale gas reservoirs. Recently, the micropore structural characterization and main controlling factors of the ancient shale have become popular research topics. The micropore structures of certain shale samples from the Niutitang Formation in the Micangshan tectonic zone were investigated at the microscale and nanoscale using low-temperature nitrogen gas adsorption (GA) and a combination of broad ion beam (BIB) milling and field-emission scanning electron microscopy (FE-SEM). Then, we analyzed how the mineral composition and thermal evolution affect the pore development in the Niutitang shale through the results of X-ray diffraction (XRD) and vitrinite equivalent reflectance (VRoequiv) calculated by bitumen reflectance (Rb). The BSE images by the BIB/FE-SEM system show that multiple pore types are present in the ancient Niutitang shale and form a complex pore network under the influences of mineral contents and thermal maturation.

Keywords

Pore structure Gas shale Minerals Organic matter Niutitang Formation Micangshan 

Notes

Acknowledgments

We would like to thank Professor Zhou Shixin for providing geological guidance and discussions during the field work.

Funding information

This study was supported by the Key Research and Development Plan Foundation, Shaanxi (grant number 2017GY-150) and the Independent Project of Key Laboratory of Coal Exploration and Comprehensive Utilization, Ministry of Land and Resources (grant number ZP2019-2).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Tao Tian
    • 1
    • 2
    • 3
    Email author
  • Shixin Zhou
    • 2
  • Deliang Fu
    • 1
  • Fu Yang
    • 1
  • Jing Li
    • 2
  1. 1.Key Lab of Coal Resources Exploration andc Comprehensive UtilizationMinistry of Land and ResourcesXi’anChina
  2. 2.Key Laboratory of Petroleum Resources Research, Institute of Geology and GeophysicsChinese Academy of SciencesLanzhouChina
  3. 3.Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary MineralsShandong University of Science and TechnologyQingdaoChina

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