A5045113871- Seismic Imaging and Inversion Techniques
- earthquake and tectonic studies
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Rock Mechanics and Modeling
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- Reservoir Engineering and Simulation Methods
- Geotechnical and Geomechanical Engineering
- Seismic Waves and Analysis
- Geological and Geophysical Studies
- GaN-based semiconductor devices and materials
- Landslides and related hazards
- Nuclear Physics and Applications
- Geophysical Methods and Applications
- Earthquake Detection and Analysis
- Geology and Paleoclimatology Research
- Geomechanics and Mining Engineering
- NMR spectroscopy and applications
- ZnO doping and properties
- Ga2O3 and related materials
- Tunneling and Rock Mechanics
University of Wisconsin–Madison
2015-2024
Pacific Northwest National Laboratory
2023
International Ocean Discovery Program
2020
GFZ Helmholtz Centre for Geosciences
2013-2017
Geriatrische Gesundheitszentren
2014-2015
Centre de Géosciences
2015
Institute of Solid Mechanics
2014
Helmholtz-Zentrum Berlin für Materialien und Energie
2014
Stanford University
2007-2013
Kyoto University
2006-2009
Understanding the controls on elastic properties of reservoir rocks is crucial for exploration and successful production from hydrocarbon reservoirs. We studied static dynamic shale gas Barnett, Haynesville, Eagle Ford, Fort St. John shales through laboratory experiments. The these vary significantly between reservoirs (and within a reservoir) due to wide variety material composition microstructures exhibited by organic-rich shales. (Young’s modulus) (P- S-wave moduli) parameters generally...
We studied the elastic moduli, ductile creep behavior, and brittle strength of shale-gas reservoir rocks from Barnett, Haynesville, Eagle Ford, Fort St. John shale in a series triaxial laboratory experiments. found strong correlation between compositions, particular, volume clay plus kerogen intact rock strength, frictional viscoplastic creep. Viscoplastic strain was approximately linear with applied differential stress. The reduction sample during suggested that accommodated by slight pore...
Abstract The spatiotemporal, kinematic, and source characteristics of induced seismicity occurring at different fluid injection rates are investigated to determine the predominant physical mechanisms responsible for northwestern part Geysers geothermal field, California. We analyze a relocated hypocenter catalog from cluster where significant variations stress tensor orientation were previously observed correlate with rates. find that these changes may be related increased pore pressure...
Abstract The long‐term temporal and spatial changes in statistical, source, stress characteristics of one cluster induced seismicity recorded at Geysers geothermal field (U.S.) are analyzed relation to the operations, fluid migration, constraints on maximum likely magnitude. Two injection wells, Prati‐9 Prati‐29, located northwestern part their associated composed 1776 events throughout a 7 year period were analyzed. catalog was relocated, source including focal mechanisms static parameters...
The Taiwan Chelungpu‐fault Drilling Project (TCDP) was undertaken in 2002 to investigate the faulting mechanism of 1999 Chi‐Chi earthquake. Hole B penetrated Chelungpu fault, and recovered core samples from between 948.42 m 1352.60 depth. Three zones, marked 1136mFZ, 1194mFZ 1243mFZ, were recognized as active fault‐zones within fault. Multi‐Sensor Core Logger measurements revealed lower densities higher magnetic susceptibilities black gouge zones all three fault zones. Even though zone that...
The production of hydrocarbons from unconventional reservoirs, like tight shale plays, increased tremendously over the past decade. Hydraulic fracturing is a commonly applied method to increase productivity well drilled in these reservoirs. Unfortunately, rate decreases time presumably due fracture closure. closure induced by proppant crushing and embedment depends on mechanical properties shales proppants that are influenced confining pressure (pc), temperature (T), composition. We...
Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests ("in-situ" tests) and 3D- volumetric Digital Image Correlation (3D-DIC) can provide important insight into mechanical behaviour deformation processes granular materials such as sand. The application these tools to investigate mechanisms failure in rocks is also obvious interest. However, relevant applied confining pressures for testing on are higher than those sands therefore stronger pressure...
and sense of shear, they are categorized as thrust (105/30), left-lateral fault (015/30 -80), right-lateral (195/30 normal (105/5 -10), backthrust (285/40 -50).Ten zones have been recognized between 500 2003 m.We interpret the zone located at around 1111 m being most likely candidate for rupture deformation during Chi-Chi earthquake.The seated 1712 is Sanyi which 600 beneath Chelungpu zone.Ten including faults, strike-slip faults classified Fault System (<1250 m) (>1500 m).According to...
The Taiwan Chelungpu‐Fault Drilling Project was undertaken in 2002 to investigate the faulting mechanism of 1999 M w 7.6 Chi‐Chi earthquake. Hole B penetrated Chelungpu fault, and core samples were recovered from between 948.42‐ 1352.60‐m depth. Three major zones, designated FZB1136 (fault zone at 1136‐m depth hole B), FZB1194, FZB1243, recognized as active fault zones within fault. Nondestructive continuous physical property measurements, conducted on all samples, revealed that three...
To unravel their long-term creep properties at simulated reservoir conditions, we conducted constant stress deformation experiments elevated confining pressures, pc = 50–115 MPa, and temperatures, T 75–150 °C, on Posidonia (GER) Bowland (UK) shale, which exhibit varying petrophysical mechanical properties. Depending applied pc–T conditions sample composition, recorded curves either only a primary (decelerating) or additionally secondary (quasi-steady state) tertiary (accelerating) phase...
Abstract Accretionary prisms commonly grow seaward, with the strata of inner prism consisting older, previously accreted outer rocks overlain by thick fore‐arc basin strata. We focus on Nankai Trough accretionary using three‐dimensional (3‐D) seismic data and logging from Integrated Ocean Drilling Program (IODP). update 3‐D volume well velocity to better constrain deeper horizons. Interpretation these horizons reveals multiple folds axial surfaces that strike near parallel modern thrust...
Abstract Understanding the stress state before and after an earthquake is essential to study how on faults evolves during seismic cycle. This integrates wellbore failure analysis, laboratory experiments, edge dislocation model Chi‐Chi earthquake. The post‐earthquake in‐situ observed along boreholes of Taiwan Chelungpu‐fault Drilling Project (TCDP) heterogeneous due lithological variations. Along borehole, we observe that drilling‐induced tensile fractures are only present in sandstones,...
The epitaxial lateral overgrowth (ELO) of GaN with a stripe tungsten (W) mask pattern is performed by hydride vapor phase epitaxy (HVPE) and buried structure the W smooth surface achieved for patterns <1120> <1100> direction. Optical crystalline characteristics ELO-GaN are investigated means cathodoluminescence (CL) imaging X-ray rocking curves (XRCs). It found that CL intensity at 133 K due to near-band edge emission stronger in laterally overgrown region comparison normal...