The 140th IROAST Seminar was held on January 8, organized by Associate Professor Atsushi SAINOKI (IROAST International Joint Research Faculty Member), Prof. Derek ELSWORTH (Pennsylvania State University), IROAST Visiting Professor, gave a lecture on “Relationship between Seismicity and Seepage Rate in Fractured Reservoirs.
Dr. Elsworth is a world-renowned researcher on fluid behavior in porous rock masses and geological structures (faults) and associated fault deformation and reactivation, and has published numerous papers in international scientific journals.
It was a very valuable opportunity for the participating students and faculty to hear his lecture directly from such a world-renowned researcher.
IROAST国際共同研究員である才ノ木敦士准教授が世話人となり、1月8日に第140回IROASTセミナーが開催されました。 IROAST客員教授であるDerek ELSWORTH教授(ペンシルバニア州立大学)をお迎えし、「亀裂性貯留層における地震度と浸透率の関連性」に関する講義が行われました。
Elsworth先生は、多孔質岩盤や地質構造物(断層)内での流体挙動やそれに伴う断層の変形・再活性化において世界的に著名な研究者であり、これまで多数の論文を国際科学誌に投稿しています。
このような世界的に権威のある研究者の講義を直接きくことができ、参加した学生・教員にとって大変貴重な機会となりました。
■Organizer|世話人
才ノ木 敦士 准教授 (大学院先端科学研究部)
Assoc. Prof. Atsushi SAINOKI (FAST, Kumamoto University)
■Speaker|講演者
Derek ELSWORTH教授(ペンシルバニア州立大学〔アメリカ〕)
Prof. Derek ELSWORTH, Pennsylvania State University, University Park, USA
■At Venue|会場の様子
■質疑応答|Q&A
■集合写真|Group Photo
国際先端科学技術研究機構(IROAST)は、ペンシルバニア州立大学所属、Derek Elsworth教授(IROAST客員教授)による、第140回IROASTセミナーを下記のとおり開催いたします。興味のある方はどなたでもご参加いただけます。
多くの皆さまのご参加をお待ちしております。
※本セミナーは英語にて行います。事前登録は不要です。
4. 概要(Abstract):Triggered seismicity is a key hazard where fluids are injected or withdrawn from the subsurface and may also impact permeability. We constrain maximum event magnitudes in triggered earthquakes by relating pre-existing critical stresses to fluid injection volume – to explain why some recorded events are significantly larger than anticipated seismic moment thresholds. This formalism is shown consistent with a number of uncharacteristically large fluid-injection-triggered earthquakes. Such methods of reactivation of fractures and faults through hydraulic stimulation in shear or in tensile fracturing are used routinely as a method to create permeability in the subsurface. Microearthquakes (MEQs) generated in such stimulations may be used as diagnostic of permeability evolution. Although high fidelity datasets are meager, the EGS-Collab and Utah FORGE demonstration projects both provide high fidelity data sets that concurrently track permeability evolution and triggered seismicity. Machine learning deciphers the principal features of MEQs and the resulting permeability evolution that best track changes in permeability – with transfer learning methods allowing robust predictions across multiple geological settings. Changes in permeability on reactivated fractures in both Mode I and II suggest that permeability () scales with the seismic moment () of individual MEQs as . This scaling relation is exact at early time but degrades with successive MEQs but presents a method for characterizing crustal permeability evolution using MEQs.
Biosketch
Derek Elsworth is G. Albert Shoemaker Chair, Professor of Energy and Mineral Engineering and Geosciences and co-director of the Center for Geomechanics, Geofluids, and Geohazards at Penn State. His interests are in the areas of computational mechanics, rock mechanics, and in the mechanical and transport characteristics of fractured rocks, with application to geothermal energy, the deep geological sequestration of radioactive wastes and of CO2, unconventional hydrocarbons including coal-gas, tight-gas-shales and hydrates, and instability and eruption dynamics of volcanoes.
http://www.ems.psu.edu/~elsworth/
5. 世話人: 才ノ木 敦士 准教授 (大学院先端科学研究部)
Email:atsushi_sainoki@kumamoto-u.ac.jp
【IROASTセミナーに関するお問合せ】
平川
Email:szk-kiko@jimu.kumamoto-u.ac.jp
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IROAST will have the 140th IROAST Seminar by IROAST Visiting Professor Derek Elsworth, Pennsylvania State University, University Park, USA as follows.
Anyone interested in this seminar is more than welcome. Pre-registration is not required.
We hope to see you at the seminar.
IROAST Seminar inquiries
Hirakawa (Ms.)
szk-kiko@jimu.kumamoto-u.ac.jp