Geochemical and Geological Characteristics of the Upper Ordovician-Lower Silurian Shales in the Upper Yangtze Basin, South China: Implication for the Shale Gas Exploration
| Autor: | Haiquan Zhang, Jian-Fei Yan, Yu-Peng Men, Wei Liu, Jun Liu, Yuefeng Shen, Jian-Wei Kang, Yuan-Yuan Sun, Xiao-Wei Chen, Qian Yu |
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| Rok vydání: | 2019 |
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| Zdroj: | ACS Omega ACS Omega, Vol 5, Iss 18, Pp 10228-10239 (2020) |
| ISSN: | 2470-1343 |
| Popis: | Shale gas exploration in the Upper Yangtze Basin has been conducted for over ten years. The successful drillings in the region suggest that well-planned geological survey and reservoir evaluation are indispensable for the success of these drillings. In this study, the shale gas potential of Late Ordovician to Early Silurian mudstones/shales of the Wufeng–Longmaxi formations in the Upper Yangtze Basin was evaluated. First, all of the available geochemical and petrological data from Late Ordovician to Early Silurian mudstones/shales in the region were compiled. Distributional patterns of total organic carbon (TOC) values, thickness, thermal maturity, and burial depth of organic-rich mudstones/shales from the targeted formations were then analyzed. Our results show that TOC values range from 1.20 to 5.12%; Ro values range from 1.92 to 2.86%; porosity varies from 0.77 to 9.2%; permeability varies from 0.015 to 1.99 md; the composition of quartz group of mineral component ranges from 18 to 85%, 59% in average; and clay mineral component ranges from 7 to 56%, 31% in average. Finally, based on these comprehensive analysis, three areas with great potential, that is, Luzhou-Xishui, western Chongqing, and Wulong-Shizhu, were selected as targets for further shale gas exploration and exploitation. |
| Databáze: | OpenAIRE |
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