海洋メタンハイドレートを用いたＣＯ２低排出発電における複雑流動現象に関する研究

甲烷水合物作为一种有前途的能源，近年来受到了世界各国的广泛关注。本研究以日本南海海槽的生产条件为对象，以海洋甲烷水合物作为能源进行利用，今年进行了甲烷水合物分解行为的放大和系统规模的可行性分析。首先，在室内多相渗流解离实验和数值模型研究的基础上，将数值模拟模型从单层薄层扩大到真实的油藏条件下的厚层多层模型。其次，根据近期地质调查资料和大规模模拟结果，对南海海槽真实的生产情况进行了讨论。详细讨论了真实的生产动态、边界条件和油藏参数的影响。该模拟中预测的生产率水平与最近的真实的生产测试一致。第三，对日本南海海槽试验和中国神湖试验进行了对比。产量预测显示出更好的协议比以前的模型和短期协议已扩展到长期产量预测。证实了甲烷水合物作为未来能源的可行性。总结了生产策略和未来的挑战，为下一步的研究。本年度已发表国际期刊论文3篇，会议论文/摘要5篇（包括1篇基调论文）。

As one promising energy resources, methane hydrate (MH) has extracted worldwide attention in recent years. This study is focused on the utilization of oceanic methane hydrate as an energy resource, which is targeted on the production conditions of Nankai Trough, Japan.In this year, scaling-up of the methane hydrate dissociation behavior and system-scale feasibility analysis have been conducted. First, based on the lab-scale dissociation experiments and numerical model development for multi-phase porous media flow, numerical simulation model is scaled-up from single thin layer to thick multi-layer model for real reservoir conditions. Second, based on the recent geological survey data and the large-scale simulation results, discussions on the Nankai Trough real production is conducted. The real production behaviors, boundary conditions and reservoir parameter effects are discussed in detail. The predicted production rate level in this simulation agrees with recent real production tests. Third, the comparison between Japan Nankai Trough and China Shenhu tests are conducted. The production prediction shows better agreement than previous models and the short-term agreement has been extended to long-term production prediction. The feasibility is confirmed for future use of methane hydrate as energy resource. Production strategy and future challenges are summarized for next-step research. 3 international journal papers, 5 conference papers/abstracts (including 1 keynote) have been published in this year.