Geochemical and Geological Characteristics of the Upper Ordovician-Lower Silurian Shales in the Upper Yangtze Basin, South China: Implication for the Shale Gas Exploration
Geochemical and Geological Characteristics of the Upper Ordovician-Lower Silurian Shales in the Upper Yangtze Basin, South China: Implication for the Shale Gas Exploration
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华南上扬子盆地上奥陶统—下志留统页岩地球化学地质特征及其对页岩气勘探的启示
DOI：
10.1021/acsomega.9b03000
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发表时间：
2020
期刊：
影响因子：
4.1
通讯作者：
Liu Jun
中科院分区：
文献类型：
--
作者：
Sun Yuan-Yuan;Yan Jian-Fei;Men Yu-Peng;Yu Qian;Liu Wei;Chen Xiao-Wei;Kang Jian-Wei;Zhang Hai-Quan;Shen Yuefeng;Liu Jun
上扬子盆地页岩气勘探已进行了十多年。在该地区的成功钻井表明，良好的计划地质调查和储层评价是这些钻井的成功必不可少的。对上扬子盆地五峰组-龙马溪组晚奥陶世-早志留世泥页岩的含气潜力进行了评价。首先，对该地区晚奥陶世至早志留世泥岩/页岩的所有地球化学和岩石学数据进行了汇编。然后分析了目的层中富有机质泥岩/页岩的总有机碳（TOC）值、厚度、热成熟度和埋藏深度的分布规律。结果表明，该地区的TOC值为1.20 ~ 5.12%，Ro值为1.92 ~ 2.86%，孔隙度为0.77 ~ 9.2%，渗透率为0.015 ~ 1.99md，矿物组分中石英族的含量为18 ~ 85%，平均为59%;粘土矿物含量7 ~ 56%，平均31%。最后，在综合分析的基础上，选择了泸州-习水、渝西、武隆-石柱3个页岩气勘探开发潜力较大的地区作为进一步勘探开发的目标。
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%;Rovalues 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.