日本浅表层水合物勘查试采进展

    Progress of shallow hydrate exploration and production test in Japan

    • 摘要: 海洋孔隙填充型水合物已得到较广泛资源调查和经过数次试采,与之相比,以赋存于冷泉、泥底辟和泥火山附近的海底表面和近海底沉积物为主的浅表层水合物的勘查试采工作刚刚起步。日本作为最早实施水合物勘查试采的国家之一,自2013财政年以来在浅表层水合物的资源勘查评价、海洋区域地质调查和环境调查、开发技术调研评价、生产系统构建等方面取得了显著进展。基于文献资料调研,概述了日本水合物研发工作的发展历程以及对浅表层水合物研发工作的整体部署,详细介绍了日本在浅表层水合物勘查试采相关领域开展的主要工作,分析认为,日本在如下4方面取得的实际经验和理论认识值得我国浅表层水合物勘查试采体系化部署借鉴参考: 以日本海为主的区域性资源和环境调查,以小范围区域为对象的资源量评价示范,以试采场地优选为目标的精细化资源和环境调查,以及“以使用大口径钻头的大范围垂直采掘方法为基础、优先考虑气体举升回收方法和船载分离方法两项关键技术以形成最优组合”的生产系统设计原则的评估确立。

       

      Abstract: Compared to the marine pore-filling hydrates which have been extensively investigated and tested for gas production, the exploration and production test (EPT) of shallow hydrates with predominant component of seabed surface and near-seafloor sediments existea in near cold seeps, mud diapirs and mud volcanoes, has a long way to go. As one of the earliest countries to implement gas hydrate EPT, Japan has made significant progress in resource survey and evaluation of shallow hydrates, marine regional geological and environmental survey, development technology investigation and evaluation, and production system construction since fiscal year 2013. Based on the literature research, the authors in this paper summarized the development process of Japan's hydrate EPT and the overall deployment of shallow hydrate EPT, and introduce the main work cartied out by Japan in the fields related to the shallow hydrates EPT. The analysis shows that Japan's practical experience and theoretical understanding in the following four aspects are worthy of reference for the systematic deployment of shallow hydrate exploration and production test in China: regional resource and environmental survey centered on the Sea of Japan; resource evaluation demonstrations in a small-scale areas; refined resource and environmental surveys for optimizing production test sites; evaluation and establishment of the production system design principle of “based on the large-scale vertical mining method using a large-diameter drill bit, giving priority to the two key technologies of gas lift recovery method and shipboard separation method to form an optimal combination”.

       

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