| 祁连山冻土区天然气水合物及其基本特征 |
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| 引用本文：祝有海,张永勤,文怀军,卢振权,王平康.2010.祁连山冻土区天然气水合物及其基本特征[J].地球学报,31(1):7-16. |
| DOI：10.3975/cagsb.2010.01.02 |
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| 基金项目:中国地质调查局地质调查项目“青藏高原冻土带天然气水合物调查评价(编号1212010818055) |
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| 中文摘要:2008年11月5日, 由中国地质科学院矿产资源研究所、勘探技术研究所和青海煤炭地质局105勘探队施工的“祁连山冻土区天然气水合物科学钻探工程”DK-1孔取得重大突破, 成功钻获天然气水合物实物样品。这是我国冻土区首次钻获并检测出的天然气水合物实物样品, 也是世界上第一次在中低纬度高原冻土区发现的天然气水合物, 具有重要的科学、经济和环境意义。目前钻获的天然气水合物均产于冻土层之下, 产出深度133~396 m, 其层位属于中侏罗统江仓组。水合物以薄层状、片状、团块状赋存于粉砂岩、泥岩、油页岩的裂隙中, 或以浸染状赋存于细粉砂岩的孔隙中。祁连山冻土区天然气水合物具有埋深浅、冻土层 薄、气体组分复杂、以煤层气为主等特征, 应是一种新类型水合物。 |
| 中文关键词:天然气水合物 冻土 祁连山 |
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| Gas Hydrates in the Qilian Mountain Permafrost and Their Basic Characteristics |
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| Abstract:The Scientific Drilling Project of Gas Hydrate in Qilian Mountain permafrost, which is located in Jugenghu mining area of the Muli Coalfield, Tianjun County, Qinghai Province, was implemented by Institute of Mineral Resources, Institute of Exploration Techniques, Qinghai No.105 Coal Geological Exploration Party and some other units during 2008-2009. Samples of gas hydrate were collected firstly from the hole of DK-1 on November 5, 2008 and again from the hole of DK-2 and DK-3 in 2009. This is the first discovery of gas hydrate in China’s permafrost and in the low-middle latitude permafrost of the world. Gas hydrates were found at the 133-396m intervals of Middle Jurassic Jiangcang Formation lying under the permafrost zone (about 95m). Gas hydrates occur in the fissures of siltstones, mudstones and oil shale, or in the pores of sandstones. Samples are white or ivory crystals and liable to burn. Obvious low temperature anomaly was identified by the infrared camera. The gas hydrate-bearing cores strongly bubble in water. Gas-bubble and water-drop are emitted from the samples and the characteristic honeycombed structure is retained. The typical spectrum curve of gas hydrate was detected by means of Raman spectrometry. Furthermore, the logging profile also indicates high electrical resistivity and sonic velocity. Gas hydrate in Qilian Mountain permafrost is a new type hydrate characterized by a relatively thin permafrost zone, shallow buried depth, complex gas components, and coal-bed methane origin. |
| keywords:gas hydrate permafrost Qilian Mountain |
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