| 下扬子地区奥陶纪页岩气地质条件及远景区优选 |
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| 作者姓名： | 殷启春 方朝刚 郑红军 王敬东 王丰 |
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| 作者单位： | 中国地质调查局南京地质调查中心,南京,210016;中国海洋大学海洋地球科学学院,青岛,266100 |
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| 基金项目： | 中央财政苏皖地区页岩气地质调查项目;中国地质调查项目 |
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| 摘 要： | 由于下扬子地区中奥陶世胡乐组和早奥陶世宁国组是具有页岩气勘探潜力的新层系,进而开展了该区页岩气地质条件分析和远景区优选工作。从胡乐组和宁国组黑色页岩构造及沉积背景入手,利用区域地质调查和钻井资料,分析奥陶纪页岩的地球化学、储层及展布特征。下扬子地区中奥陶世胡乐组和早奥陶世宁国组泥页岩有效厚度大,单层厚普遍>30 m,有机质含量高且热演化程度存在适中区,脆性矿物含量高。下扬子地区奥陶纪页岩具备页岩气形成、富集的地质条件,具有较好的资源潜力,划分出安徽宁国奥陶纪页岩气远景区和浙江淳安-桐庐奥陶纪页岩气远景区。
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| 关 键 词： | 下扬子地区 页岩气 胡乐组 宁国组 页岩气远景区 |
| 收稿时间： | 2019-03-14 |
| 修稿时间： | 2019-07-30 |
Geological conditions of Ordovician shale gas and optimization for prospective areas in the Lower Yangtze region |
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| Authors: | YIN Qi-chun FANG Chao-gang ZHENG Hong-jun WANG Jing-dong WANG Feng |
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| Affiliation: | (1. Nanjing Center, China Geological Survey, Nanjing 210016, China; 2. College of Marine Geosciences, China University of Ocean, Qingdao 266100, China) |
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| Abstract: | The Hule Formation of Middle Ordovician and the Ningguo Formation of Lower Ordovician in the Lower Yangtze region are the new interest of exploration for shale-gas intervals, thus it is highly necessary to undertake analysis of geological conditions and optimization work for prospective areas in this area. Starting from analysis of structure and sedimentary setting of black shale, this study investigated geochemistry, reserviors and distribution of Ordovician black shale using rgional geological and drilling data. The results show that the shale beds of the Hule Formation of Middle Ordovician and the Ningguo Formation of Lower Ordovician in the study area are characterized by large effective thickness with single layer thicker than 30 m, high content of organic matter, moderate thermal evolution, and high content of brittle minerals. The Ordovician shale in the Lower Yangtze region is of the favorable conditions for formation and accumulation of shale-gas and of good resource potential. The present study also suggests that the Ningguo area of Anhui Province and Chun’an-Tonglu area of Zhejiang Province are the two prospective areas for shale-gas exploration in the Lower Yangtze region. |
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| Keywords: | Lower Yangtze region shale gas Hule Formation Ningguo Formation optimization of prospective areas |
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