連携講座Collaborative Divisions

環境リスク評価学分野（産業技術総合研究所） Environmental Risk Assessment(National Institute of Advanced Industrial Science and Technology)「安全・安心」な地熱エネルギーの利用を目指して
Studies for utilization of safe and secure geothermal energy

客員教授 浅沼 宏

客員教授 張 銘

客員准教授 坂本 靖英

Professor

Professor

Associate Professor

Hiroshi Asanuma

Ming Zhang

Yasuhide Sakamoto

当講座は国立研究開発法人産業技術総合研究所，福島再生可能エネルギー研究所 (FREA)，再生可能エネルギー研究センター，および地圏資源環境研究部門（つくば）所属の研究者が兼務し，教育・研究活動を行っている。現在，本講座では環境科学専攻の博士課程学生１名をリサーチアシスタントとして雇用するとともに，福島再生可能エネルギー研究所産業人材育成事業等の枠組みを利用して共同研究を実施している。
The members of the Environmental Risk Assessment (AIST Collaborative Laboratory) are carrying out studies to enhance safe and secure utilization ofgeothermal resources mainly by investigating technologies for ultra-resolution reservoir monitoring and rock-mechanical simulation of hydraulicfracturing/stimulation. Major research activities in 2017 include (a) scientific and engineering studies for large-scale power generation from subductionorigin supercritical geothermal resources; (b) simulation, microseismic monitoring, and rock mechanical studies for monitoring and management ofgeothermal reservoirs; (c)development of a system for monitoring the environmental burden associated with geothermal development; and (d) studies forsocial acceptance of geothermal development. Research and development to simulate industries in tsunami-stricken areas was also conducted.

適正な地熱開発手法に関する研究
地下や地域の特性に応じて総合的かつ柔軟に地熱システムの設計・開発を行うための方法論（Overall System Design: OSD）や加圧注水による貯留層の能力改善に関する研究を実施している。また、温泉と地熱発電の関連に関する科学的基礎データ取得を目的として温泉モニタリングシステムの開発や温泉・地熱地域用硫化水素モニタリングシステムの開発を行っている。

国内外の研究者と連携して、沈み込み帯に起源を有する超臨界地熱資源による発電の可能性を探っている。2050 年に国内総容量数10GW の商用発電の実現を目標に NEDO からの委託を受け、科学的、技術的、経済的視点からの実現可能性詳細検討を実施している。また、経産省からの委託事業として超臨界地熱資源開発時の岩体挙動シミュレータの開発、高温坑井用坑内機器用基礎技術・素材の開発等

微小地震や自然電磁波による地熱貯留層の高精度モニタリング
福島県柳津西山地熱フィールドにおいて、貯留層への涵養注水時の微小地震および自然電磁波計測を実施している。これにより、貯留層ルドで取得した微小地震に散乱・反射解析等の最先端の技術を適用し、貯留層内での流体挙動の把握を実現した。

Fig.1 Typical supercritical geothermal system in
Tohoku (Northeast Japan)

64 Coexistence Activity Report 2017

事業を実施している。

Members of the laboratory have been investigating the feasibility of power
generation using supercritical geothermal resources that originate in thesubduction of oceanic plates in cooperation with scientists and engineers
worldwide. Funded by NEDO, detailed feasibility studies are being carriedout to establish several tens of GW of total capacity in 2050 from scientific,
engineering, and economical points of view. METI has also funded ourteam for (a) development of simulators of dynamic and hydraulic behaviorof supercritical rock bodies and (b) development of fundamental
technologies and materials for supercritical boreholes.

国際貢献、社会貢献、他研究機関との連携等

Microseismic and magneto-telluric
monitoring of geothermal reservoirs

福島県における地熱資源開発に関する情報連絡会専門家部会委員，

Microseismic and magneto-telluric (MT) monitoring of geothermal
reservoirs associated with treatment injection has been carried out at theYanaizu-Nishiyama geothermal site in Fukushima since 2015 to reveal theresponse of the reservoir to water injection by researchers in the lab.
Modern techniques in seismic signal processing, including reflection andscattering analyses, have been developed and applied to microseismic data
sets from various geothermal sites worldwide, and the behavior of fluid
inside and around geothermal reservoirs has been successfully imaged.

GFZ, LBNL, LLNL, BNL, SNL, USGS, BRGM, ベルリン自由大学，

Fig.2 Microseismic imaging of geothermal reservoirsFig.3 Field experiment of monitoring system of hotsprings●国際貢献
ドイツ、米国、イタリア、アイスランド等の国立研究所、大学、民間企業との国際共同研究を行っている。
●社会貢献・社会連携
浅 沼：ICDP 委 員，J-DESC 陸 上 掘 削 部 会 執 行 部 委 員，JFES
Board Member，JOGMEC 地熱貯留層探査技術推進委員会委員，日本地熱学会評議員，同企画委員，同総務委員等●他研究機関との連携
チューリッヒ工科大学，MIT, ITB, ISOR 等●自治体，NPO 等との連携
福島県，山形県，郡山市，気仙沼市●小中学校等との連携
浅沼：出前授業（3 回），公開講座（1 回）

Fig.4 Development of optical fiber distributed sensor
for supercritical geothermal wells

Technological support has been provided to seeds in local industries in thearea damaged by the great 2011 earthquake and tsunami. Geothermalrelated technologies have been developed under this scheme.

Contribution to international/society andcollaboration with other organizations●International contribution
International contribution to partners in Germany, the US, Italy, andIceland have been made mainly in the area of ultra-high-temperaturegeothermal development.
●Social contribution
Prof. Asanuma has been a board member of international and domestic
scientific drilling projects. He has also been a member of evaluation andadvisory committees of governmental and local community agencies aswell as a board member of academic societies.
●Collaboration with other organizations
The laboratory is collaborating with domestic and foreign national
laboratories, universities, and industries. It is actively engaging in mutualvisits, web communication, and joint publications.
●Collaboration with local communities
The lab has a long history of collaboration with local communities, mainly
in northeast Japan (Tohoku) in the area of education of children andstudents. Prof. Asanuma has made three “delivery lectures” about
renewable energy.

Fig.5 WS with researchers in US-DOE laboratories

Department of Frontier Sciences for Advanced Environmentへの注水の効果をモニタリングしている。また、国内外の地熱フィー

復興予算を使用して、被災地企業が有する技術シーズの実用化支援

先端環境創成学専攻を実施している。

Research on supercritical geothermal
resources

A development methodology based on the concept of overall system design(OSD), which has a flexible nature to fit to social and subsurface conditions
gradually revealed in the development, has been studied. We have also
developed systems for monitoring gas and hot springs, which has enabled
us to collect scientific data for environmentally/socially appropriatedevelopment.

Technological support of local industries

被災地企業の技術支援
超臨界地熱開発に関する研究

Research on proper development ofgeothermal resources

Fig.6 Experiment at FREA, AIST by graduate studentof GSES

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