Benchmarking conventional and machine learning segmentation techniques for digital rock physics analysis of fractured rocks

M Reinhardt, A Jacob, S Sadeghnejad… - Environmental Earth …, 2022 - Springer
Image segmentation remains the most critical step in Digital Rock Physics (DRP) workflows,
affecting the analysis of physical rock properties. Conventional segmentation techniques …

Stress sensitivity of porosity and permeability under varying hydrostatic stress conditions for different carbonate rock types of the geothermal Malm reservoir in …

D Bohnsack, M Potten, S Freitag, F Einsiedl… - Geothermal …, 2021 - Springer
In geothermal reservoir systems, changes in pore pressure due to production (depletion),
injection or temperature changes result in a displacement of the effective stresses acting on …

Direct and indirect laboratory measurements of poroelastic properties of two consolidated sandstones

G Blöcher, T Reinsch, A Hassanzadegan… - International Journal of …, 2014 - Elsevier
Experimental measurements to derive the drained bulk C and the solid bulk C su
compressibility, the poroelastic Biot coefficient α, Skempton coefficient B as well as porosity …

The effects of temperature and pressure on the porosity evolution of Flechtinger sandstone

A Hassanzadegan, G Blöcher, H Milsch, L Urpi… - Rock Mechanics and …, 2014 - Springer
A porosity change influences the transport properties and the elastic moduli of rock while
circulating water in a geothermal reservoir. The static and dynamic elastic moduli can be …

Hydromechanical investigations on the self-propping potential of fractures in tight sandstones

C Cheng, H Milsch - Rock Mechanics and Rock Engineering, 2021 - Springer
The hydromechanical properties of single self-propping fractures under stress are of
fundamental interest for fractured-rock hydrology and a large number of geotechnical …

Transient heat transfer processes in a single rock fracture at high flow rates

S Frank, T Heinze, S Pollak, S Wohnlich - Geothermics, 2021 - Elsevier
Understanding the process of heat transfer in fractures and the influence of fracture surface
morphology is crucial for optimized heat mining. In this work, we investigated transient heat …

Evolution of permeability and Biot coefficient at high mean stresses in high porosity sandstone

MD Ingraham, SJ Bauer, KA Issen… - International Journal of …, 2017 - Elsevier
A series of constant mean stress (CMS) and constant shear stress (CSS) tests were
performed to investigate the evolution of permeability and Biot coefficient at high mean …

[HTML][HTML] Effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture

Y Ji, C Kluge, H Hofmann, G Blöcher - Journal of Rock Mechanics and …, 2022 - Elsevier
The accurate evaluation of pore pressure and injected volume is crucial for the laboratory
characterization of hydromechanical responses of rock fractures. This study reports a series …

Predicting mode-I fracture toughness of rocks using soft computing and multiple regression

DG Roy, TN Singh, J Kodikara - Measurement, 2018 - Elsevier
Mode-I fracture toughness (FT) is an important property to model fracture propagation in
rocks and it has wide application in a plethora of rock mechanics problems such as …

The stress‐memory effect of fracture stiffness during cyclic loading in low‐permeability sandstone

C Kluge, G Blöcher, H Hofmann… - Journal of …, 2021 - Wiley Online Library
The hydraulic performance and mechanical stability of open fractures are crucial for several
subsurface applications including fractured geothermal reservoirs or nuclear waste …