中国多年冻土区天然气水合物地球化学勘探技术研究进展

Research Progress of Geochemical Exploration Technology for Natural Gas Hydrate in the Permafrost Area,China

我国多年冻土区多位于中纬度高原地区,与环北冰洋极地地区多年冻土的状态不完全相同,天然气水合物成因机理、赋存环境和基本特征更为复杂。近10年来,在自然资源部行业专项和中国地质调查局水合物试采专项的资助下,先后在青藏高原和东北多年冻土区开展了天然气水合物地球化学勘探技术攻关,总结了多年冻土区天然气水合物地球化学指标组合和识别标志,探讨了多年冻土区天然气水合物地球化学成藏机制,研发了多年冻土区天然气水合物地球化学勘查模型,初步建立了多年冻土区天然气水合物调查地球化学方法技术体系,在勘探实践中发挥了重要的作用,地球化学方法技术对天然气水合物的有效性得到了初步检验和应用,具有广阔的应用前景。

Most of the permafrost regions are located in mid-latitude plateau regions in China,which are different from the permafrost regions around the Arctic Ocean,and the genesis mechanism,occurrence environment and basic characteristics of Natural Gas Hydrate(NGH)are more sophisticated.Qilian Mountain is verified as the only permafrost area in which the samples of NGH can be obtained through scientific drillings.In the past 10 years,with the support of Special Research Project of the Ministry of Natural Resources and the National Special Project of Gas Hydrate of China Geological Survey,the key technologies of NGH geochemical exploration have been successively carried out in the Qinghai-Tibet Plateau and the Mohe basin.The effective index and identification marks of NGH geochemical exploration are optimized,and the accumulation mechanism of NGH in permafrost area is discussed.The geochemical exploration model of NGH was developed,and the geochemical exploration technology system for NGH was preliminarily established,which shows the validity of exploration practice.The effectiveness of geochemical exploration technology system for NGH has been preliminarily tested and applied,which has a broad application prospect.