| 青海聚乎更矿区三露天井田中侏罗统沉积环境 |
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| 引用本文： | 杨致宇,王伟超,邵龙义,刘文进,吕景高,李永红,文怀军.青海聚乎更矿区三露天井田中侏罗统沉积环境[J].现代地质,2015,29(5):1073-1086. |
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| 作者姓名： | 杨致宇 王伟超 邵龙义 刘文进 吕景高 李永红 文怀军 |
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| 作者单位： | (1.中国矿业大学(北京)地球科学与测绘工程学院，北京100083；2.青海煤炭地质一0五勘探队，青海 西宁810007；3.青海煤炭地质局，青海 西宁810001) |
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| 基金项目： | 神华青海能源开发有限责任公司“青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价”项目（SHQHNY201307001）；中国地质调查局油气资源调查中心“我国非常规能源矿产 调查评价选区研究”子课题(1212011220794)。 |
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| 摘 要： | 青海聚乎更矿区是全球陆域中纬度地区天然气水合物的首要发现地，水合物储存层位主要为该矿区三露天井田的中侏罗世含煤岩系。依据钻孔岩心及测井曲线，对该矿区三露天井田含煤岩系进行沉 积环境分析，在单孔沉积相及沉积相断面图分析的基础上，重建研究区的岩相古地理格局。木里组下段岩性主要为细砾岩、含砾粗砂岩及粗砂岩等粗粒岩石，以辫状河为主的沉积环境；木里 组上段岩性以厚层砂岩与厚层煤层互层为特征，反映了水体逐渐加深的过程中发育三角洲为主的沉积环境；江仓组下段以细粒砂岩及泥岩互层夹薄煤层为特征，反映水体进一步加深过程中的三角洲前缘和滨浅湖环境；江仓组上段以油页岩、暗色泥岩为主，含有瓣鳃类化石，反映湖泊为主的沉积环境。
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| 关 键 词： | 中侏罗世 沉积环境 天然气水合物 聚乎更矿区 三露天井田 |
Depositional Environments of the Middle Jurassic in the Sanlutian Mining Field of the Juhugeng Mining Area in Qinghai Province |
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| Institution: | (1.School of Geosciences and Surveying Engineering, China University of Mining & Technology, Beijing100083, China; 2.Qinghai No.105 Coal Geological Exploration Team, Xining, Qinghai810007，China; 3.Qinghai Bureau of Coal Geology, Xining, Qinghai 810001，China) |
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| Abstract: | The Juhugeng mining area in Qinghai Province is the primary discovery site of the gas hydrates in the mid-latitude of the global land, with the gas hydrates being preserved in the Middle Jurassic coal-bearing series of the Sanlutian mining field. This paper analyzed the depositional environments of the coal-bearing series in the Sanlutian mining field by using the borehole cores and logging curves. The palaeogeographic outlines of each lithological member of the Middle Jurassic have been reconstructed based on the single borehole facies analysis and the cross-section facies correlations. The lithology of the Lower Member of the Muli Formation is mainly fine conglomerates, pebbly sandstone and coarse-grained sandstone, reflecting a braided river-dominated environment. The Upper Member of the Muli Formation is characterized by the thick sandstone interbedded with thick coal seam, indicating a gradual deepening process and development of the deltaic environment. The Lower Member of the Jiangcang Formation is characterized by the fine -grained sandstones interbedded with mudstones and thin coal seams, signifying a further deepening process and development of the delta front and shore-shallow lake environments. The Upper Member of the Jiangcang Formation consists mainly of oil shale and dark mudstone containing bivalve fossils, reflecting a shallow to deep lake environment. |
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| Keywords: | Middle Jurassic depositional environment gas hydrate Juhugeng mining area Sanlutian mining field |
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