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甲烷水合物是冻结在海洋沉积层和陆地永久冻土层中尚未开发的重要能源。一般估计,在地球海底下面和两极地区的甲烷水合物的能源蓄积量是地球已知油、气和煤总和的两倍以上,因此,甲烷水合物有可能成为世界潜在的主要能源。全世界包括美国在内的6个国家都在进行各种气水化合物的研究,日本人第一个制订了调查研究这种潜在能源的规划。最近,日本勘查工作取得新的进展。勘查人员改进和开发了多项技术,获得了自然状态下的甲烷水合物的样品,并测出气水化合物地层的含气性。关键技术是如何确定在取样过程中甲烷气体的逸出量。日本勘查者曾于1998年初在加拿大西北伊努维克北面约200公里处,与加拿大、美国地质调查所合作打了一口1150米深的试验井,钻到了永久冻土层。加拿大试验
Methane hydrate is an important source of energy that has not yet been developed in freezing marine deposits and permafrost. It is generally estimated that methane hydrate reserves below and below the Earth’s seafloor are more than twice the amount of oil, gas and coal known to the Earth, and therefore methane hydrates may potentially become the world’s major potential energy source. Six countries all over the world, including the United States, are studying various kinds of gas and water compounds. The first Japanese people have made plans for investigating this potential energy source. Recently, Japan’s exploration work made new progress. The investigators refined and developed several techniques to obtain samples of methane hydrate in its natural state and measure the gas-bearing properties of the gas-hydrate formation. The key technique is how to determine the evolution of methane gas during the sampling process. Japanese investigators had drilled a 1,150-meter deep test well in cooperation with the Geological Survey of Canada and the United States about 200 kilometers north of Inuvik, northwestern Canada, in early 1998 and reached the permafrost. Canadian test