Stephan Matthai

A New Explicit Sequentially Coupled Technique for Chemo-Thermo-Poromechanical Modelling and Simulation in Shale Formations

LT Akanji, A Ibrahim, H Hamidi, S Matthai, A Akisanya

Journal article  |  2023  |  Energies

A new explicit sequentially coupled technique for chemo-thermo-poromechanical problems in shale formations is developed. Simultane..

The role of natural fracture activation in hydraulic fracturing for deep unconventional geo-energy reservoir stimulation

J Wang, HP Xie, SK Matthai, JJ Hu, CB Li

Journal article  |  2023  |  Petroleum Science

The presence of sealed or semi-sealed, multiscale natural fracture systems appears to be crucial for the successful stimulation of..

Finite element simulations of hydraulic fracturing: A comparison of algorithms for extracting the propagation velocity of the fracture

E Pezzulli, M Nejati, S Salimzadeh, SK Matthaei, T Driesner

Journal article  |  2022  |  ENGINEERING FRACTURE MECHANICS

The finite element method is a powerful and general numerical method used to simulate subsurface processes. In this paper, we take..

Modelling CO2 plume spreading in highly heterogeneous rocks with anisotropic, rate-dependent saturation functions: A field-data based numeric simulation study of Otway

Q Shao, M Boon, AA Youssef, K Kurtev, SM Benson, SK Matthai

Journal article  |  2022  |  International Journal of Greenhouse Gas Control

In this field-data-based simulation study, we apply novel rate-dependent, anisotropic saturation functions curve-fitted to match t..

An enhanced J-integral for hydraulic fracture mechanics

E Pezzulli, M Nejati, S Salimzadeh, SK Matthäi, T Driesner

Journal article  |  2022  |  International Journal for Numerical and Analytical Methods in Geomechanics

This article revisits the formulation of the J-integral in the context of hydraulic fracture mechanics. We demonstrate that the us..

Upscaled Dynamic Relative Permeability for Unstable CO2 Flow in Stratified Porous Media

AAA Youssef, SK Matthäi

Journal article  |  2022  |  Transport in Porous Media

In geologic porous media, layering is ubiquitous on all length scales ranging from sub-mm compositional laminations to km-thick fo..

Adaptive conservative time integration for transport in fractured porous media

Michael Liem, Stephan Matthai, Patrick Jenny

Journal article  |  2022  |  ADVANCES IN WATER RESOURCES

The time step of an explicit time integration scheme for solving time-dependent hyperbolic partial differential equations in a fin..

Anisotropic rate-dependent saturation functions for compositional simulation of sandstone composites

Maartje Boon, Stephan K Matthai, Qi Shao, AbdAllah A Youssef, Achyut Mishra, Sally M Benson

Journal article  |  2022  |  JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

Determination of representative saturation functions for permeable reservoir sandstones requires consideration of mm-cm scale lami..

Estimation of Fracture Aperture in Naturally Fractured Reservoirs Using an Ensemble Smoother with Multiple Data Assimilation

M Liem, SK Matthai, P Jenny

Conference Proceedings  |  2022  |  European Conference on the Mathematics of Geological Reservoirs 2022, ECMOR 2022

Accurate modelling of flow in geothermal and hydrocarbon reservoirs is necessary for performance prediction. When fractures are na..

Simulating unsteady CO2 flow through brine-saturated cross-bedded sandstones: towards relative permeability curves for unstable displacement

A Youssef, A Tertois, Q Shao, S Matthai

Conference Proceedings  |  2022  |  European Conference on the Mathematics of Geological Reservoirs 2022, ECMOR 2022

At geo-storage conditions, carbon-dioxide is a supercritical low-viscosity fluid that is buoyant with a mobility ratio < 1, highly..