Composition of the "Organic Matter- clay Mineral" Aggregates and Occurrence of Shale Gas on the Lower Cambrian Black Shale in Guizhou, China

DOI

10.2991/edep-18.2018.62How to use a DOI?

Keywords

Black shale; organic matter; organic matter mineral aggregates; shale gas occurrence

Abstract

Analyses by X ray diffraction analysis (XRD) indicate that the main mineral composition of the Lower Cambrian black shale in Guizhou is quartz, clay minerals, albite, dolomite and pyrite, the clay minerals are mainly composed of illite. The characteristics of organic carbon in the black shale are discussed. The content of original organic carbon is between 3.024% and 8.22% with an average of 5.63%, and the organic matter is mainly type I. Analyses show that trace elements such as As, Mo and Pb of the black shale in this study area are obviously enriched, which are correlated with the organic matter content. Organic matter mineral aggregates and organic matter gelatinous mineral aggregates are generally existed in the black shale, indicating that there is a trade-off relationship between organic matter and mineral. In the black shale, organic matter illite mineral aggregates are produced. The pores are developed in clay minerals which are filled with organic matter, constituting the organic matter clay mineral aggregates. Organic matter clay mineral aggregates, organic matter mineral aggregates and various pores and fractures in organic matter provide space for shale gas occurrence. The experimental results show that the organic matter clay mineral aggregates have a greater methane adsorption capacity than the pure clay minerals, which affects the occurrence of shale gas in black shales.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Rui-Yong MAO
AU  - Jie ZHANG
AU  - Jin-Guo GE
AU  - Sha WANG
PY  - 2018/10
DA  - 2018/10
TI  - Composition of the "Organic Matter- clay Mineral" Aggregates and Occurrence of Shale Gas on the Lower Cambrian Black Shale in Guizhou, China
BT  - Proceedings of the 2018 International Conference on Energy Development and Environmental Protection (EDEP 2018)
PB  - Atlantis Press
SP  - 398
EP  - 404
SN  - 2352-5401
UR  - https://doi.org/10.2991/edep-18.2018.62
DO  - 10.2991/edep-18.2018.62
ID  - MAO2018/10
ER  -