| 湘中—湘南烟溪组沉积特征及页岩气勘探潜力 |
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| 引用本文： | 刘辰生,王辉,李想,邱争科,郭建华,王宗秀.湘中—湘南烟溪组沉积特征及页岩气勘探潜力[J].沉积学报,2020,38(1):218-230. |
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| 作者姓名： | 刘辰生 王辉 李想 邱争科 郭建华 王宗秀 |
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| 作者单位： | 1.有色金属成矿预测与地质环境监测教育部重点实验室（中南大学），长沙 410083 |
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| 基金项目： | 湖南省杰出青年基金项目2017JJ1034 |
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| 摘 要： | 湖南地区，尤其是湘中—湘南区域奥陶系烟溪组是我国新发现的页岩气勘探层位，该地层具有岩性变化大、有机碳含量高、成熟度高的特点。通过野外露头资料、钻井资料分析表明烟溪组岩性以硅质岩和碳质页岩为主，砂质页岩和砂岩次之。根据岩性、沉积构造以及纵向上岩石组合特征分析，认为烟溪组沉积相类型多样，包括深水盆地相、浅水盆地相、浅水陆棚相和浊积扇相等。研究表明:深水盆地相分布在湘南，浅水盆地和浅水陆棚相分布在湘中中部，而浊积扇相分布在湘中西北部、北部和东部等区域，沉积相的分布规律决定了烟溪组页岩气的勘探方向。横向上，湘南深水盆地硅质岩和碳质页岩TOC含量较低，而湘中浅水盆地相碳质页岩TOC含量高、厚度大，是烟溪组最有利的勘探区域；纵向上，烟溪组第三岩性段碳质页岩有机质丰度最高，脆性矿物含量高，是页岩气勘探的“甜点”层位。
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| 关 键 词： | 湘中地区 烟溪组 页岩气 深水盆地相 浅变质 |
| 收稿时间： | 2018-12-20 |
Sedimentary Characteristics and Exploration Potential for Shale Gas in Yanxi Formation,Central and Southern Hunan |
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| Abstract: | The Ordovician Yanxi Formation in Hunan, especially in central and southern Hunan, is a newly discovered shale gas exploration horizon in China. It has large lithological variation, high organic carbon content and high maturity. Outcrop data and drilling data analysis indicate that the Yanxi Formation is mainly composed of siliceous rock and carbonaceous shale overlain by sandy shale and sandstone. The lithology, sedimentary structure and vertical rock assemblage characteristics show that the Yanxi Formation contains various sedimentary facies types, including deep-water basin facies, deep-water shelf facies, shallow-water shelf facies, and turbidite fan facies. It was found that, in plan, deep-water basin facies are distributed in southern Hunan, deep-water shelf and shallow-water shelf facies in central Hunan, and turbidite fan facies in northern and eastern parts of central and western Hunan. The facies distribution determines the direction for shale gas exploration in the Yanxi Formation. The TOC content of siliceous rocks and carbonaceous shales in the deep-water basin of southern Hunan is low, whereas the thick carbonaceous shales of the shelf facies in central Hunan have a high TOC, and are the most favorable for exploration in the Yanxi Formation. In particular, the carbonaceous shale in the third lithology section has the highest abundance of organic matter and a high brittle mineral content, and has the greatest shale gas exploration potential. |
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