祁连山冻土区天然气水合物科学钻探工程概况

2008～2009年，中国地质调查局组织中国地质科学院矿产资源研究所、勘探技术研究所、青海煤炭地质105勘探队等单位，在祁连山木里地区实施“祁连山冻土区天然气水合物科学钻探工程”，迄今共完成DK-1、DK-2、DK-3和DK-4 4个钻探试验井，总进尺2059.13m，并在井深133~396m区间钻获多层天然气水合物，取得了找矿工作的重大突破，证实中国冻土区存在规模巨大的天然气水合物潜在能源。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、以热解气为主等特征，应是一种新类型的水合物。初步研发集成出一套冻土区天然气水合物调查方法、钻探施工工艺和配套装备，为下一步的调查研究奠定了基础。

An overview of the Scientific Drilling Project of Gas Hydrate in Qilian Mountain Permafrost, northwestern China

Four scientific drilling wells, namely DK-1, DK-2, DK-3 and DK-4, with a total footage of 2059.13m, for The Scientific Drilling Project of Gas Hydrate in Qilian Mountain Permafrost, were performed and completed by China Geological Survey and some other units during 2008-2009. Samples of gas hydrate were collected separately in the 133-396m interval from holes DK-1, DK-2 and DK-3. It was for the first time to discover gas hydrate in the permafrost of China as well as in the middle latitude permafrost of the world. Gas hydrate from the Qilian Mountain is a new type hydrate characterized by a relatively thin permafrost zone, shallow buried depth, complex gas components, and dominant thermogenic gas. In addition, geological, geophysical, geochemical and drilling techniques and essential equipment for gas hydrate in permafrost have been developed, thus providing a foundation for further investigation and research.