| 雪峰山前陆盆地下志留统页岩气勘探潜力 |
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| 引用本文： | 刘辰生,郭建华,王宗秀.雪峰山前陆盆地下志留统页岩气勘探潜力[J].地球科学,2019,44(11):3678-3691. |
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| 作者姓名： | 刘辰生 郭建华 王宗秀 |
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| 作者单位： | 1.中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南长沙 410083 |
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| 基金项目： | 湖南省自然科学基金项目2017JJ1034中国地质调查局油气调查项目DD20160183 |
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| 摘 要： | 雪峰山志留系前陆盆地分布在湘中-湘西北-四川盆地，是上扬子板块主要的盆地类型，目前针对该前陆盆地沉积特征和页岩气勘探潜力的研究少见.根据野外资料、测井资料和分析测试资料分析了湘西北和湘中地区前陆盆地沉积建造过程和页岩气勘探潜力.结果表明湘中前陆盆地前渊带以浊积扇和浅海陆棚相沉积为主，而湘西北隆后盆地沉积相类型丰富，包括潮坪相、浅海陆棚相、滨岸相、三角洲相和碳酸盐岩台地相等.虽然前渊带和隆后盆地沉积相类型和沉积厚度差异较大，但沉积旋回的划分却是一致的，因此前渊带和隆后盆地相互连通，雪峰山对其两侧盆地的遮挡作用有限.地球化学测试分析表明研究区隆后盆地页岩的有机碳含量、有机质类型均较四川盆地的焦石坝差.湖南地区志留系页岩各项地化指标较差的主要原因是其缺少龙马溪组第一旋回的黑色碳质页岩.
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| 关 键 词： | 扬子板块 前陆盆地 志留系 碳质页岩 焦石坝 油气地质 |
| 收稿时间： | 2019-08-25 |
Potential for Shale Gas Exploration of Xuefengshan Foreland Basin of Lower Silurian |
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| Abstract: | The Xuefengshan Silurian foreland basin is located in the Central-Northwest Hunan-Sichuan basin, which is the main basin type of the Upper Yangtze plate. Sedimentary formation process and shale gas exploration potential of foreland basins in Northwest and Central Hunan are analyzed based on field data, logging data and testing data. The facies of foredeep include turbidite fan and shelf. Facies of back bulge basin include tidal flat, shelf, shore, delta and carbonate platform facies and so on. So, facies in back bulge basin are more abundant than in foredeep. Though the facies are different greatly in foredeep and back bulge basin, the sedimentary cycles in those systems are coherent. So foredeep and back bulge basin are connected and Xuefengshan obstructing is limited for the foredeep and back bulge basin distributed around Xufengshan. Based on geochemistry data and analysis data, TOC and organic matter type in study area are poorer than in Jiaoshiba area in Sichuan basin. Based on regional section correlation, black carbonaceous shale distributed at the bottom of Longmaxi Formation is absent in the study, causing TOC and organic matter type being poorer than in Jiaoshiba. The main reason for the poor geochemical indexes of Silurian shale in Hunan is the lack of black carbonaceous shale in the first cycle of Longmaxi Formation. |
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