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Volume 30 Issue 5
Oct 2019
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Wenda Zhou, Shuyun Xie, Zhengyu Bao, Emmanuel John M. Carranza, Lei Lei, Zhenzhen Ma. Chemical Compositions and Distribution Characteristics of Cements in Longmaxi Formation Shales, Southwest China. Journal of Earth Science, 2019, 30(5): 879-892. doi: 10.1007/s12583-019-1013-7
Citation: Wenda Zhou, Shuyun Xie, Zhengyu Bao, Emmanuel John M. Carranza, Lei Lei, Zhenzhen Ma. Chemical Compositions and Distribution Characteristics of Cements in Longmaxi Formation Shales, Southwest China. Journal of Earth Science, 2019, 30(5): 879-892. doi: 10.1007/s12583-019-1013-7

Chemical Compositions and Distribution Characteristics of Cements in Longmaxi Formation Shales, Southwest China

doi: 10.1007/s12583-019-1013-7
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  • Corresponding author: Shuyun Xie
  • Received Date: 03 Nov 2018
  • Accepted Date: 24 Feb 2019
  • Publish Date: 01 Oct 2019
  • Shale gas resources have been regarded as a viable energy source, and it is of great significance to characterize the shale composition of different cements, such as quartz and dolomite. In this research, chemical analysis and the multifractal method have been used to study the mineral compositions and petrophysical structures of cements in shale samples from the Longmaxi Formation, China. X-ray diffraction, electron microprobe, field emission scanning electron microscopy, cathodoluminescence microscopy and C-O isotope analyses confirmed that cements in the Longmaxi Formation shales are mainly composed of Fe-bearing dolomite and quartz. Fe-bearing dolomite cements concentrate around dolomite as annuli, filling micron-sized inorganic primary pores. Quartz cements in the form of nanoparicles fill primary inter-crystalline pores among clay minerals. Theoretical calculation shows that the Fe-bearing dolomite cements formed slightly earlier than the quartz cements, but both were related to diagenetic illitization of smectite. Moreover, multifractal analysis reveals that the quartz cements are more irregularly distributed in pores than the Fe-bearing dolomite cements. These results suggest that the plugging effect of the quartz cements on the primary inoraganic pore structures is the dominant factor resulting in low interconnected porosity of shales, which are unfavorable for the enrichment of shale gas.

     

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