Sungho Lee

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Verified

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• Doctor of Philosophy
• Senior Researcher at Korea Institute of Geoscience and Mineral Resources

The additional work of ploughing makes seamounts more resistant to subduction and more strongly coupled than smoother areas. Nevertheless, the idea that subducted seamounts are weakly coupled and slip aseismically has become dominant in the last decade. This idea is primarily based on the claim that a seamount being subducted in the southern Japan...

The southeastern Korean Peninsula (SeKP) has experienced intense deformation owing to subduction and back-arc extension at the eastern continental margin of the Eurasian plate, leading to the formation of complex tectonic structures. Abnormally high surface heat flux, Cenozoic volcanism, signatures of mantle degassing and hydrothermal alteration, a...

The 2017 Mw 5.5 Pohang earthquake occurred near an enhanced geothermal system site and generated thousands of aftershocks, the largest of which, a Mw 4.6 earthquake, occurred 87 days after the mainshock. Redistribution of the groundwater pressure perturbed by the mainshock has been suggested as a cause of the postseismic stress changes triggering s...

The hydro-mechanical (HM) two-way sequential coupling in the TOUGH2-FLAC3D linking algorithm is validated completely and successfully in both M to H and H to M directions, which are initiated by mechanical surface loading for geomechanical validation and hydrological groundwater pumping for hydrogeological validation, respectively. For such complet...

The Korean Peninsula (KP), located along the eastern margin of the Eurasian and Amurian plates, has experienced continual earthquakes from small to moderate magnitudes. Various models to explain these earthquakes have been proposed, but the origins of the stress responsible for this region's seismicity remain unclear and debated. This study aims to...

A set of relatively simple five local shear and tension failure variables is presented and then implemented into a generalized poroelastic hydromechanical numerical model to analyze failure potential and stability of variably saturated geologic media. These five local shear and tension failure variables are formulated from geometrical relationships...

A coupled reservoir-well simulation scheme is established to analyze quantitatively multi-phase fluid flow and heat transport due to carbon dioxide (CO2) injection in a reservoir rock-injection well system and to evaluate rigorously the CO2 injection efficiency in terms of the CO2 injection rate and injectivity. Two different cases of the CO2 injec...

A series of probabilistic evaluation is performed sequentially using three-dimensional geologic modeling and grid-based Monte Carlo simulation as a linked methodology to estimate multi-fluid-phase (i.e., individual gas-, liquid-, supercritical-, and whole fluid-phase) carbon dioxide (CO2) storage capacities of the target clastic saline formations i...

본 연구에서는 유체 주입 및 생산(fluid injection and production)에 의하여 단층 파쇄대(fault fracture zone) 또는 단층 손상대(fault damage zone)를 포함한 지층(geologic formation) 시스템 내에서 발생하는 지하수 유동(groundwater flow) 및 지반 변형(land deformation)을 통합적으로 예측하고 해당 시스템의 수리-역학적 안정성(hydro-mechanical stability)을 정량적으로 평가하기 위하여 범용 다차원 완전 연동 수리-역학적 수치 모델인 COWADE123D (Kim, 1995, 2002, 2006, 2018)를 이...

Three-dimensional lithology and property modeling is performed after three-dimensional formation modeling was carried out to establish lithology and property models of the Janggi Conglomerate in the Janggi Basin, Korea for TOUGH simulation of geologic carbon dioxide (CO2) storage. The Janggi Conglomerate is composed of conglomerate, sandstone, and...

지질학적으로 마그마 정치와 냉각에 수반하여 아임계-초임계 지하수 유동 및 지열 이동이 발생하며, 이로 인하여 마그마 기원의 열수 시스템이 형성 및 진화하는 것으로 알려져 있다. 아울러 마그마가 지형적으로 고도가 높은 산지 아래에 정치 및 냉각되는 화산암 지대에서는 서로 다른 두 종류의 독특한 지하수 유동 시스템인 심부의 부력-구동형(buoyancy-driven) 지하수 유동 시스템과 천부의 지형-구동형(topography-driven) 지하수 유동 시스템이 함께 형성되며, 이 두 가지 지하수 유동 시스템의 시공간적 상호 작용과 경계에서의 지중 유체 혼합이 마그마 기원의 열수 광상 형성에 매우 중요한 역할을 하는 것으로...

Coupled groundwater flow and heat transport phenomena associated with crust- and basin-scale magma activities play very crucial roles in both geologic processes (e.g., contact metamorphism, contact metasomatism, volcanic eruption) and hydrothermal mineral and energy resources (e.g., ore deposits, hot springs, geothermal energy). As a result, such c...

A series of probabilistic evaluation is performed using geologic formation modeling and grid-based Monte Carlo simulation to estimate geologic carbon dioxide (CO2) storage capacities of target saline formations at a prospective storage site in the Janggi Basin, Korea. The Janggi Conglomerate (Reservoir 1) and the lower member of the Seongdongri For...

지각 또는 분지 등 광역 규모의 마그마 활동에 수반되는 지열 이동 및 지하수 유동 현상은 지질과학 측면에서는 접촉변성작용, 접촉교대작용, 열수 시스템 형성, 화산 분화 등에서, 에너지자원 측면에서는 광상 형성, 온천 형성, 지열 시스템 에너지 개발 등에서 매우 결정적인 역할을 하는 것으로 알려져 있다. 따라서 이러한 지질과학 및 에너지자원 측면에서 마그마 활동의 영향을 받는 심부 지각에서 천부 지표면에 걸친 매우 광범위한 지역의 온도 및 압력 조건에서의 지열 이동 및 지하수 유동 현상을 보다 정확하게 예측하고 합리적으로 평가하는 것이 매우 중요하다. 이를 위하여 본 연구에서는 마그마 정치(emplacement)와 냉각(...

A series of three-dimensional geologic modeling is performed using a three-dimensional geologic model to characterize quantitatively and visualize realistically distributions of geologic formations and lithofacies of a heterogeneous metamorphic complex, which is considered as a prospective deep underground research laboratory site, distributed in S...

A series of numerical modeling is performed using a parallel multi-phase thermo-hydrological numerical model to evaluate quantitatively impacts of the grid refinement on numerical modeling of behavior and trapping mechanisms of carbon dioxide (CO2) injected into deep storage formations. The results of the numerical modeling show that the grid refin...

A series of numerical modeling is performed using a multi-phase thermo-hydro-chemical numerical model to analyze integratedly behavior (flow, diffusion, adsorption) and storage mechanisms of fluids (groundwater, carbon dioxide, methane) due to carbon dioxide injection in coal beds and to evaluate quantitatively impacts of the cleat spacing on such...