成果報告書詳細
管理番号20130000000180
タイトル*平成23年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(風力発電その他未利用エネルギー) 都市における地中熱大規模利用可能性の総合評価
公開日2013/7/10
報告書年度2011 - 2011
委託先名株式会社地圏環境テクノロジー 国立大学法人東京大学 応用地質株式会社
プロジェクト番号P10020
部署名技術開発推進部
和文要約
英文要約Title: New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (wind power generation and other untapped energies ) / Feasibility Study on Large-Scale Geo-thermal Energy Potential in Megacity FY2011 Progress Report Geosphere Environmental Technology Corp.

1.Scope and Framework The aim of this study is to develop a new geo-thermal potential map and the associated software for large-scale energy utilization in megacity. These products lead us to more accurate and quantitative estimation of geo-thermal potential with its usage efficiency and the environmental impact. For example, the developed products need to be helpful to answer the following questions; Is it possible to achieve the stable energy production- Is there any serious impact to the surrounding natural environment (e.g. subsurface water flow, water temperature and existing ecosystem, etc.)- Is it economically feasible (How much the life-cycle cost)- This on-going phase-A study program is comprised of four work packages; 1) Subsurface environment modeling for ministry or business building in metropolitan Tokyo, 2) Evaluation of the geo-thermal potential for pilot field using terrestrial water flow (surface and subsurface water) and heat transport numerical simulation technique, 3) Literature investigation on non-destructive ground survey, and 4) Business Planning. One of the crucial issues assessing the geo-thermal potential in megacity is groundwater flow and geology in subsurface environment. To implement this study under the actual field condition, we firstly defined a pilot-field and tried to develop geo-thermal potential map through the up-to-date watershed modeling technique. 2.Subsurface environment modeling for ministry or business building in Tokyo As the pilot-field, we have selected the whole area of Chiyoda-ku and constructed a 3-dimensional geological model based on existing boreholes data. The selected area is 11.35 km2 with 300m depth. To develop the 3D geological model, we used more than several hundreds existing boring log data. As the promising geological layers for heat energy production and recharge (sink), Tokyo gravel layer and Koyozan sand-gravel layer are evaluated within the pilot area. These specific geological features are as followings; 1) Tokyo gravel-layer-distributes in the depth ranges from 25m to 30m which is almost below groundwater table -can be traced by the existing boring log data -is almost horizontal structure and distributes in deep in the eastern area -is partially disappeared due to water-driven erosion 2) Koyozan sand-gravel layer -distributes in the depth rages from 40m to 50m which is almost below groundwater table -is affected by Kazusa formation group -is partially disappeared in southern area due to water-driven erosion Using the huge amount of boring information, we have developed a new 3D hydrogeological model. This model is used in surface and subsurface water flow and heat flow modeling. 3.Evaluation of the geo-thermal potential in pilot field using the surface and subsurface water flow and heat transport numerical simulation We have developed a computer simulation model for the pilot field to understand water flow and energy transport behavior in surface and subsurface environment. Firstly we are currently trying to reproduce the multiple existing observed data such as groundwater level, river discharge and so on. After the good matching between them were attained, then we will discussed about 1)surface and subsurface interaction of water flow and heat transport, and 2)detailed groundwater flow around the multiple geo-thermal wells. A general-purpose terrestrial water flow and heat transport coupled simulator GETFLOWS was adopted in this study. The GETFLOWS treats the meteorological/hydrologic processes of the near-surface atmospheric boundary layer and the near-coastal hydrosphere,
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