Derek Elsworth

Research Field

Hydraulic, electrical, and tracer test results are presented for a natural fracture in granite. The hydraulic and electrical apertures of the fracture are similar and suggest minimal fracture surface‐to‐surface contact. Tracer aperture exceeds hydraulic aperture indicating transport at a rate less than that predicted on the basis of hydraulic aperture. Numerical simulation of tracer transport reveals that transport within the fracture is not explicable in terms of parallel plate flow and that transport occurs locally at rates in excess of the overall rate defined by tracer aperture.

TRACER

Aperture (computer memory)

10.1029/93gl01384

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Citations (57)

Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

Fuel (2021)

Lei Hou Derek Elsworth

Shrinkage

Cementitious

10.1016/j.fuel.2021.120188

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Citations (14)

Analysis of thermally induced changes in fractured rock permeability during 8 years of heating and cooling at the Yucca Mountain Drift Scale Test

International Journal of Rock Mechanics and Mining Sciences (2008)

Jonny Rutqvist Barry Freifeld Ki‐Bok Min Derek Elsworth Yiu Fai Tsang

10.1016/j.ijrmms.2008.01.016

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Citations (89)

Dynamic fluid interactions during CO2-ECBM and CO2 sequestration in coal seams. Part 2: CO2-H2O wettability

Fuel (2020)

Sijian Zheng Yanbin Yao Derek Elsworth Dameng Liu Yidong Cai

Coalbed Methane

10.1016/j.fuel.2020.118560

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Citations (42)

Hydro-mechanical-chemical modeling of sub-nanopore capillary-confinement on CO2-CCUS-EOR

Energy (2021)

Mingyu Cai Yuliang Su Derek Elsworth Lei Li Liyao Fan

Nanopore

Capillary pressure

Isothermal process

10.1016/j.energy.2021.120203

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Citations (29)

Three-Dimensional Numerical Modeling of Grain-Scale Mechanical Behavior of Sandstone Containing an Inclined Rough Joint

Rock Mechanics and Rock Engineering (2020)

Jinzhou Tang Sheng‐Qi Yang Derek Elsworth Tao Yan

Coalescence (physics)

Direct shear test

10.1007/s00603-020-02281-2

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Citations (24)

Impact of Gas Adsorption Induced Coal Matrix Damage on the Evolution of Coal Permeability

Rock Mechanics and Rock Engineering (2013)

Wancheng Zhu Chenhui Wei Jishan Liu Tao Xu Derek Elsworth

Effective stress

Matrix (chemical analysis)

10.1007/s00603-013-0392-9

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Citations (55)

Interactions of multiple processes during CBM extraction: A critical review

International Journal of Coal Geology (2011)

Jishan Liu Zhongwei Chen Derek Elsworth Hongyan Qu Dong Chen

10.1016/j.coal.2011.06.004

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Citations (385)

Water Liberating/Sealing effects on shale gas Extraction: A fully coupled multidomain and multiphysics model

Fuel (2022)

Wai Li Jishan Liu Jie Zeng Yee‐Kwong Leong Derek Elsworth

Multiphysics

10.1016/j.fuel.2022.124953

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Citations (8)

Frictional Properties of Feldspar-chlorite Altered Gouges and Implications for Fault Reactivation in Hydrothermal Systems

Authorea (Authorea) (2023)

Zijuan Hu Chongyuan Zhang Lei Zhang Derek Elsworth Quan Gan

As a particularly common minerals in granites, the presence of feldspar and altered feldspar-chlorite gouges at hydrothermal conditions have important implications in fault strength and reactivation. We present laboratory observations of frictional strength and stability of feldspar (K-feldspar and albite) and altered feldspar-chlorite gouges under conditions representative of deep geothermal reservoirs to evaluate the impact on fault stability. Velocity‐ stepping experiments are performed at a confining stress of 95 MPa, pore pressures of 35-90 MPa and temperatures of 120-400°C representative of in situ conditions for such reservoirs. Our experiment results show that the feldspar gouge is frictionally strong (μ~0.71) at all experimental temperatures (~120-400℃) but transits from velocity-strengthening to velocity-weakening at T>120°C. Increasing the pore pressure increases the friction coefficient (~0.70-0.87) and the gouge remains velocity weakening, but this weakening decreases as pore pressures increase. The presence of alteration-sourced chlorite leads to a transition from velocity weakening to velocity strengthening in the mixed gouge at experimental temperatures and pore pressures. As a ubiquitous mineral in reservoir rocks, feldspar is shown to potentially contribute to unstable sliding over ranges in temperature and pressure typical in deep hydrothermal reservoirs. These findings emphasize that feldspar minerals may increase the potential for injection-induced seismicity on pre-existing faults if devoid of chlorite alteration.

Fault gouge

10.22541/essoar.170158290.00446303/v1

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Papers

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