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

  • Petroleum, Natural Gas Geology
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Abstract

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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Acknowledgments

This work was financially funded by National Key R&D Program of China (No. 2016YFC0600501), and the support from Natural Science Foundation of China (Nos. 41572315, 41872250), and also supported by the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (No. CUG170104). The authors would like to thank Dr. Zhang and Mr. Wang in the Key Lab of Carbonate Reservoirs, CNPC, Hangzhou. Also the authors want to express their sincere appreciations for the English polishing and constructive suggestions of the anonymous reviewers during the peer review. The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1013-7.

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Authors and Affiliations

  1. State Key Laboratory of Geological Processes and Mineral Resources (GPMR), School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

    Wenda Zhou, Shuyun Xie & Lei Lei

  2. Faculty of Chemistry and Material Sciences, China University of Geosciences, Wuhan, 430074, China

    Zhengyu Bao & Zhenzhen Ma

  3. Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Westville, 3629, South Africa

    Emmanuel John M. Carranza

  4. Economic Geology Research Centre (EGRU), James Cook University, Townsville, QLD, 4811, Australia

    Emmanuel John M. Carranza

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  3. Zhengyu Bao
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  4. Emmanuel John M. Carranza
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  5. Lei Lei
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  6. Zhenzhen Ma
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Correspondence to Shuyun Xie.

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Zhou, W., Xie, S., Bao, Z. et al. Chemical Compositions and Distribution Characteristics of Cements in Longmaxi Formation Shales, Southwest China. J. Earth Sci. 30, 879–892 (2019). https://doi.org/10.1007/s12583-019-1013-7

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  • DOI: https://doi.org/10.1007/s12583-019-1013-7

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