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VERSION:2.0
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CALSCALE:GREGORIAN
X-WR-CALNAME:ESE Seminar - Pengliang Yu: "Empowering Enhanced Geothermal Sy
 stems: Integrating Modelling and Laboratory Experiments"
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260908T071645Z
UID:tag:localist.com\,2008:EventInstance_52252483560668
DTSTART:20260309T193000Z
DTEND:20260309T202000Z
DESCRIPTION:Abstract\n\nEnhanced geothermal systems (EGS) have emerged as a
  key technology for harnessing high-temperature energy from hot dry rock (
 HDR) at depths of ~3–10 km. Rapid progress in horizontal drilling and mu
 lti-stage hydraulic fracturing has enabled creation of large stimulated re
 servoir volumes\, yet major challenges remain — fracture-flow short-circ
 uiting\, limited ability to characterize permeability evolution during sti
 mulation\, and injection-induced seismicity.\n\nWe illustrate and address 
 some of these challenges through coupled thermo-hydro-mechanical (THM) sim
 ulations of a partially bridging multi-stage hydraulic-fracture well desig
 n that mitigates short-circuiting and delays thermal breakthrough relative
  to conventional fully bridging designs (Yu et al.\, 2021a). Building on t
 his framework\, we quantify permeability evolution and evaluate induced se
 ismicity driven by long-term thermo-poroelastic stressing during productio
 n (Yu et al.\, 2023). By separating thermoelastic\, poroelastic\, and comb
 ined thermo-poroelastic contributions\, we show that thermoelastic stressi
 ng dominates stress redistribution and seismicity rate in the stimulated r
 eservoir\, while poroelastic effects tend to stabilize and delay failure b
 y moderating stress changes.\n\nDuring shear stimulation\, microearthquake
 s (MEQs) carry information about hydraulic rock properties\, particularly 
 permeability. We develop a mechanistic scaling that links seismic moment a
 s diagnostic of incremental permeability creation during shear stimulation
 \, and validate the relationship using laboratory fault-reactivation exper
 iments with absolute constraints on seismic moment\, demonstrating proport
 ionality between permeability change and seismic moment (Yu et al.\, 2026)
 . This MEQ–permeability linkage is applied to field data from the 2021 G
 onghe EGS stimulations to infer the evolving 3D permeability distribution 
 by estimating source parameters (e.g.\, source radius and stress drop) fro
 m raw waveforms. The resulting workflow enables near-real-time reservoir s
 tate estimation to support operational decision-making during stimulation.
 \n\nBio\n\nDr. Pengliang Yu is a postdoctoral researcher at the EMS Energy
  Institute and the G3 Center in the Department of Energy and Mineral Engin
 eering at The Pennsylvania State University. He received his Ph.D. in 2022
  from the Geothermal Institute\, University of Auckland\, New Zealand. His
  research advances safe and efficient subsurface energy engineering\, with
  an emphasis on enhanced geothermal systems\, integrating theoretical anal
 ysis\, coupled thermal–hydro–mechanical (THM) modeling\, machine learn
 ing\, and laboratory experimentation. Dr. Yu received the 2025 ARMA Rock M
 echanics Research Award and the 2024 Penn State EMS Postdoctoral Excellenc
 e in Research Award.\n\nResearch/Related Papers\n\nYu\, P.\, Dempsey\, D.\
 , & Archer\, R. (2021). A three-dimensional coupled thermo-hydro-mechanica
 l numerical model with partially bridging multi-stage contact fractures in
  horizontal-well enhanced geothermal system. International Journal of Rock
  Mechanics and Mining Sciences\, 143\, 104787.\n\nYu\, P.\, Dempsey\, D.\,
  Archer\, R.\, Marone\, C.\, Elsworth\, D. (2023) Numerical Modeling of Pe
 rmeability Enhancement and Induced Seismicity during EGS Operation using a
  Partially Bridging Multi-Stage Hydraulic Fracture design. World Geotherma
 l Congress 2023 https://worldgeothermal.org/pdf/IGAstandard/WGC/2023/360.p
 df \n\nYu\, P.\, Eijsink\, A.\, Wang\, J.\, Marone\, C.\, & Elsworth\, D. 
 (2026). Seismicity diagnostic of permeability creation from centimeter to 
 subkilometer scales in crystalline rock during shear stimulation. Science 
 Advances\, 12(2)\, eady5201.
GEO:37.426823;-122.174006
LOCATION:Green Earth Sciences Building\, 104
SUMMARY:ESE Seminar - Pengliang Yu: "Empowering Enhanced Geothermal Systems
 : Integrating Modelling and Laboratory Experiments"
URL;VALUE=URI:https://events.stanford.edu/event/ese-seminar-pengliang-yu-em
 powering-enhanced-geothermal-systems-integrating-modelling-and-laboratory-
 experiments
CATEGORIES:Class/Seminar
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