A5047675317- Rock Mechanics and Modeling
- Hydraulic Fracturing and Reservoir Analysis
- Groundwater flow and contamination studies
- Soil and Unsaturated Flow
- Seismic Imaging and Inversion Techniques
- Landslides and related hazards
- Drilling and Well Engineering
- Dam Engineering and Safety
- CO2 Sequestration and Geologic Interactions
- Reservoir Engineering and Simulation Methods
- Tunneling and Rock Mechanics
- Methane Hydrates and Related Phenomena
- earthquake and tectonic studies
- Numerical methods in engineering
- Hydrocarbon exploration and reservoir analysis
- Nuclear and radioactivity studies
- Geophysical Methods and Applications
- Diamond and Carbon-based Materials Research
- Nuclear Materials and Properties
- Geophysical and Geoelectrical Methods
- Geotechnical Engineering and Soil Mechanics
- Electromagnetic Simulation and Numerical Methods
- Advanced Numerical Methods in Computational Mathematics
- Smart Materials for Construction
- Geotechnical and Geomechanical Engineering
Lawrence Berkeley National Laboratory
2016-2025
Quintessa (United Kingdom)
2024
Pinterest (United States)
2024
China University of Petroleum, East China
2024
Berkeley College
2023
Pacific Northwest National Laboratory
2023
Energy Biosciences Institute
2021-2022
Hohai University
2013-2017
Abstract Understanding the thermal effects on rock is critical for exploration of geothermal resources and temperature‐driven evolution Earth. The macroscale mechanical behavior granite under loading can be complicated due to microcracking heterogeneity minerals. In this study, thermally induced microcrack propagation was first observed in real time by an ultrahigh‐temperature instrument optical microscope. previous investigation believed that α – β quartz transition at approximately 573°C...
Residual trapping is an important process that affects the efficiency of cyclic storage and withdrawal in-situ production hydrogen in geological media. In this study, we have conducted pore-scale modeling to investigate effects pore geometry injection rate on occurrence residual via dead-end bypassing. We begin our theoretical numerical analyses using a single rectangular understand key controls further investigated two factors affecting bypassing: (a) continuous cycle injection-extraction...
The greatest challenges of rigorously modeling coupled hydro-mechanical (HM) processes in fractured geological media at different scales are associated with computational geometry. These include dynamic shearing and opening intersecting fractures discrete fracture as a result processes, contact alteration along rough surfaces that triggers structural physical changes micro-asperity scale. In this paper, these tackled by developing comprehensive approach for based on numerical manifold method...
Abstract Understanding mechanisms controlling fluid injection-triggered seismicity is key in defining strategies to ameliorate it. Recent triggered events (e.g. Pohang, Mw 5.5) have exceeded predictions of average energy release by a factor >1000x, necessitating robust methodologies both define critical antecedent conditions and thereby constrain anticipated event size. We maximum magnitudes resulting from triggering as function pre-existing stresses injection volume. Fluid experiments on...
Abstract The greatest challenges of rigorously modeling coupled hydro-mechanical processes in fractured rocks at different scales are associated with computational geometry. In addition, selections continuous or discontinuous models, physical laws, and coupling priorities based on geometric features determine the applicability a numerical model for certain type problem. this study, we present our multi-scale capabilities that have been developed manifold method analyzing rocks. Based their...
Abstract In this study we use numerical experiments to analyze reactive flow and transport behavior in discrete intersecting fracture networks, focusing on (a) how reaction‐induced changes physical chemical properties affect connectivity (b) networks developed the Earth's critical zone contribute carbon sequestration via mineral weathering reactions. first part of study, used two‐dimensional simulations impacts mixing a natural network. We concluded that can substantially alter connectivity,...
Abstract We present a new pore‐scale model for multicomponent advective‐diffusive transport with coupled mineral dissolution and precipitation. Both precipitation are captured simultaneously by introducing phase transformation vector field representing the direction magnitude of overall change. An effective viscosity is adopted in simulating fluid flow during dissolution‐precipitation that can accurately capture velocity without any empirical parameters. The proposed approach validated...
This work demonstrates the potential of generating H2 and geologically storing CO2 simultaneously in basalt formations. Basalt is able to produce CO2-saturated water at a rate 46.68 ppm d−1 under 25 °C, with generation rates leveling off after 6 days. At reaction temperature 60 cumulative hydrogen production for 5 days reaches 11,960 ppm, its daily more than 51 times that °C. The CO2-acidified experiment produced most H2, presumably due pH buffering system. water–solid interface provided by...
SUMMARY A major challenge in seepage analysis is to locate the phreatic surface an unconfined aquifer. The unknown and assumed as a discontinuity separating domain into dry wet parts, thus should be determined iteratively with special schemes. In this study, we systematically developed new numerical manifold method (NMM) model for analysis. NMM general modeling continuous discontinuous deformation unified mathematical form. novelty of our rooted two‐cover‐mesh system: covers are fixed...
Abstract The recent development of the TOUGH3 code allows for a faster and more reliable fluid flow simulator. At same time, new versions FLAC3D are released periodically, allowing features execution. In this paper, we present first implementation coupling between FLAC3Dv6/7, maintaining parallel computing capabilities coupled geomechanical codes. We compare newly developed version with analytical solutions previous approach, provide some performance analysis on different meshes varying...
Abstract Shearing of fractures and faults is important because it can result in permeability change or even induce seismicity—both are keys for efficient safe energy recovery storage Earth systems. Quantitative analysis shearing intersecting challenging involve dynamic frictional contacts that complicated by deformation the rock matrix. To predict fractures/faults, we attempt to answer question how intersections impact a fracture network whether simplify description as compared classical...
Abstract Micromechanical modeling of geomaterials is challenging because the complex geometry discontinuities and potentially large number deformable material bodies that contact each other dynamically. In this study, we have developed a numerical approach for micromechanical analysis with dynamic contacts. our approach, detect contacts among multiple blocks arbitrary shapes, enforce different constraints three states separated, bonded, sliding, iterate within time step to ensure convergence...
Fracture injection/shut-in tests are commonly used to measure the state of stress in subsurface. Injection creates a hydraulic fracture (or some cases, opens preexisting fracture), and then pressure after shut-in is monitored identify closure. Different interpretation procedures have been proposed for estimating closure, sometimes yield significantly different results. In this study, direct, in-situ strain measurements observe reopening The were performed as part EGS Collab project,...
Summary In the numerical modeling of fluid flow in heterogeneous geological media, large material contrasts associated with complexly intersected interfaces are challenging, not only related to mesh discretization but also for accurate realization corresponding boundary constraints. To address these challenges, we developed a discontinuous approach media using manifold method (NMM) and Lagrange multiplier (LMM) The advantages NMM include meshing efficiency fixed mathematical grids (covers),...