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

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教員・学生と連携し研究教育活動を行うとともに、新エネルギー・産業技術総合開発機構（NEDO）からの委託等を受け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.

Ming Zhang

Yasuhide Sakamoto

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、
NEDO からの委託を受け、温泉と地熱発電の関連に関する科学的基礎データ取得・評価のための AI-IoT 温泉モニタリングシステムの開発を本年度から開始した。

被災地企業の技術支援
超臨界地熱開発に関する研究
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 の商用発電を実現するために、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・試掘への詳細事前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で、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、これにより、貯留層への注水の効
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や遠方場地震の影響評価等を実現するとともに坑井近傍の超高分解能探査技術の FS を実施している。

Fig.1 Model of typical supercritical geothermal
system in Tohoku (Northeast Japan)

58 Coexistence Activity Report 2018

In cooperation with scientists and engineers worldwide, members of thelaboratory have investigated the feasibility of power generation using
supercritical geothermal resources that originate in the subduction of theoceanic plate. With funding from New Energy and Industrial Technology
Development Organization (NEDO), the laboratory has conducted detailed
feasibility studies from the scientific, engineering, and economics pointsof view to establish several dozens of GW of total capacity by 2050. The
laboratory’s team has also received Ministry of Economy, Trade andIndustry (METI) funding to develop (a) simulations of supercritical rockbodies’ dynamic and hydraulic behavior and (b) 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

GFZ、LBNL、LLNL、BNL、SNL、USGS、BRGM、ベルリン自由大学、Since 2015, researchers from the laboratory have carried out microseismic
and magneto-telluric monitoring of geothermal reservoirs associated withtreatment injections at the Yanaizu-Nishiyama geothermal site in
Fukushima in order to reveal the reservoir’s response to such water
injections. The team members have developed and applied modern
techniques in seismic signal processing, including reflection and scattering
analyses, to create microseismic data sets for various geothermal sites

Fig.2 Estimated pH value of subcritical/supercritical fluid

Fig.3 Array response of microseismic
monitoring network of geothermal systems●国際貢献
ドイツ、米国、イタリア、アイスランド、フランス等の国立研究所、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、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、日本地熱学会評議員、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、PSU、ITB、ISOR 等●自治体、NPO 等との連携
福島県、山形県、郡山市、気仙沼市等●小中学校等との連携
浅沼：出前授業（6 回）、公開講座（1 回）

Fig.4 Semi-commercial model of monitoring
system of hot spring

The laboratory is gradually developing studies to establish a development
methodology that uses the concept of overall system design, which isflexible enough to fit the social and subsurface conditions. Monitoring ofgases and hot springs has also enabled the laboratory’s researchers tocollect scientific data on the proper development of geothermic resources.

Technological support of local industries
The laboratory has provided technological support regarding seeds tolocal industries in the areas by the 2011 Tohoku earthquake and tsunami.
Many geothermal-related technologies have been developed under thisscheme.

Contributions to international society andcollaborations with other organizations●International contribution
The laboratory works with partners in Germany, the US, Italy, France, andIceland—mainly in the area of ultrahigh-temperature geothermaldevelopment.
●Social contribution
Prof. Asanuma is a member of the boards for various international anddomestic scientific drilling projects. He is also a member of evaluation andadvisory committees for governmental agencies and local communities, aswell as a member of the boards of various academic societies.
●Collaboration with other organizations
The laboratory collaborates with domestic and international laboratories,
universities, and industrial organizations. This includes mutual visits, active
web communications, and joint publications.
●Collaboration with local communities
The laboratory has a long history of collaboration with local communities,
mainly in northeast Japan (e.g., Tohoku), to educate children. Prof. Asanuma
has also delivered three lectures on renewable energy to students.

Fig.5 Surface photo of fracture in granite forpermeability evaluation

Department of Frontier Sciences for Advanced Environment

果をモニタリングしている。また、国内外の地熱フィールドで取得した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事業を実施している。

Research on the proper development ofgeothermal resources先端環境創成学専攻

機器用基礎技術・素材の開発等を実施している。

Research on supercritical geothermal
resources

worldwide. They have also successfully imaged the behavior of fluids
inside and around geothermal reservoirs to evaluate the impacts ofteleseismic earthquakes.

Fig.6 Outreach activity at FREA Open-day

Coexistence Activity Report 201859