Article
Geochemistry & Geophysics
Nicolas Brantut, Franciscus M. Aben
Summary: The new type of transducer is capable of measuring local pore fluid pressure in rock samples under high confining pressure conditions, with high accuracy and flexibility in design. The prototypes show good linearity up to 80 MPa with minimal deviations, and are useful for tracking and quantifying changes in permeability associated with faulting and transient flow in different types of rock.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Lisa Winhausen, Alexandra Amann-Hildenbrand, Reinhard Fink, Mohammadreza Jalali, Kavan Khaledi, Pooya Hamdi, Janos L. Urai, Joyce Schmatz, Florian Amann
Summary: This paper presents a comparative laboratory study of different methods to determine the water permeability of saturated Opalinus Clay, and found the results obtained by different methods differ less than 15 percent. The pore pressure oscillation technique appears to be the most efficient in terms of experimental handling and data density, providing continuous data on permeability and storativity over a user-defined period of time.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Engineering, Civil
Jesus Alberto Mezquita Gonzalez, Jean-Christophe Comte, Anatoly Legchenko, Ulrich Ofterdinger, David Healy
Summary: The study assessed the use of electrical resistivity tomography (ERT) combined with borehole data to analyze the spatial variability of groundwater storage in weathered/fractured basement rock aquifers. Results showed the importance of hydrogeological conceptual constraints provided by ERT and the influence of clay minerals on resistivity data in accurately predicting groundwater storage properties. The study demonstrated the potential of resistivity tomography for quantifying groundwater storage heterogeneity in such aquifers with reasonable uncertainty.
JOURNAL OF HYDROLOGY
(2021)
Article
Geochemistry & Geophysics
P. Schmidt, N. Dutler, H. Steeb
Summary: In this study, a hydro-mechanical simulation model was proposed to investigate the interaction between fluid flow and fracture deformation under in situ stress conditions. The model was applied to experimental field data and provided insights into the leading mechanisms of flow processes during hydraulic testing. The study emphasized the importance of considering both local and non-local fracture deformation in inverse analysis of hydraulic testing data to improve the understanding of hydro-mechanical flow processes in fractured reservoirs.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Lucas Pimienta, Beatriz Quintal, Eva Caspari
Summary: While hydro-mechanical coupling in rocks explains how fluid-saturated rocks respond to pressure variations, the relationship between properties may not always be straightforward, especially in rocks with different pore types. The interdependence between mechanical and hydraulic properties, which differ based on pore families, can lead to underestimation of rock compressibility in poroelasticity experiments.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
M. Soldi, L. Guarracino, D. Jougnot
Summary: Dissolution and precipitation processes alter the structure of porous media, affecting their macroscopic properties. A theoretical model is proposed to estimate the effective excess charge density, which has been validated using experimental data.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
L. Friedli, N. Linde, D. Ginsbourger, A. Doucet
Summary: This study explores lithological tomography using the pseudo-marginal method, which involves Monte Carlo sampling and importance sampling to approximate the intractable likelihood of geological parameters. By demonstrating the effectiveness of the correlated PM method and a prior-preserving proposal scheme, the study shows significant improvements in posterior exploration in both linear and nonlinear settings.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
L. Friedli, N. Linde, D. Ginsbourger, A. Doucet
Summary: This article discusses using the pseudo-marginal method in lithological tomography to estimate the posterior distribution of (hydro)geological parameters. By utilizing importance sampling and a prior-preserving proposal scheme, the proposed method outperforms current state-of-the-art methods in both linear and non-linear settings.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Construction & Building Technology
Yuqin Li, Brian Y. Lattimer, Scott W. Case
Summary: This study evaluates the measurement of properties of construction materials under high temperature exposure, finding that virgin and char materials can be used in combination with thermogravimetric data to estimate material properties at intermediate decomposition levels. Permeability depends on the structure and composition of the material, with decomposition increasing space between elements and resulting in higher permeability.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Biomedical
Elisa Fiume, Alessandro Schiavi, Gissur Orlygsson, Cristina Bignardi, Enrica Verne, Francesco Baino
Summary: Proper microstructural and transport properties are crucial for scaffold design in tissue engineering applications. Evaluating permeability remains a challenge, while pore characteristics are relatively easier to assess.
ACTA BIOMATERIALIA
(2021)
Article
Engineering, Chemical
Heewon Jung, Christof Meile
Summary: The research shows that permeability can change significantly near pore closure without large changes in porosity, and spatially non-uniform biofilm growth depends strongly on Peclet (Pe) and diffusive Damkohler numbers (Da). The study also demonstrates that Pe and Da can describe the evolution of porosity and permeability of porous media with various pore geometries.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Geochemistry & Geophysics
Qing Cao, Zhangxing Chen, JingZhou Zhao, Jiacheng Dang, Jiaxuan Song, Bin Chen
Summary: The study thoroughly researched the parameters of tight sandstone reservoirs in Upper Paleozoic in Ordos basin and analyzed the impact of diagenetic evolution on porosity and throats. Results showed that grain size and siliceous cement are key factors influencing porosity evolution and pore-throat systems.
Article
Engineering, Chemical
Jakub Janus
Summary: Recent research has developed a numerical model to simulate a longwall ventilated by a U-system in underground mines. The model considers the actual shape of the adjacent goaf and parameters characterizing porosity and permeability distribution. Results show that the simpler two-dimensional calculations can be verified and the impact of simplifications on the simulation results can be evaluated by comparing them with the three-dimensional flow calculations. The possibility of conducting extensive numerical calculations for flow problems in underground mines with more precise descriptions is demonstrated.
Article
Geochemistry & Geophysics
Robert L. Walker, Matthew G. Knepley, Brad T. Aagaard, Charles A. Williams
Summary: PyLith is an open-source code for modeling earthquake faulting. The recent update includes a flexible multiphysics implementation. The researchers demonstrated the effectiveness of the new physics by extending the code to model fully coupled continuum poromechanics and comparing it to standard benchmarks.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Rong Peng, Xingxing Huang, Zichun Liu, Huafei Li, Bangrang Di, Jianxin Wei
Summary: Compared with seismic wave fields, porosity and permeability have a more significant influence on seismoelectric coupling. Seismoelectric effect mainly generates coseismic signals (CS) and interface responses (IR). However, the impact of porosity and permeability on these two seismoelectric fields is still unclear. This paper provides a numerical analysis of the response characteristics of CS and IR with respect to porosity and permeability, respectively. The results show that porosity has a higher sensitivity in both CS and IR fields, while permeability mainly affects the IR field with almost no response in the CS field.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2023)
Article
Engineering, Chemical
Alejandro Fernandez Visentini, Pietro de Anna, Damien Jougnot, Tanguy Le Borgne, Yves Meheust, Niklas Linde
Summary: This study investigates the impact of diffusion-limited mixing on bulk electrical conductivity in a porous medium with layered solute concentration distribution. The results reveal that the electrical data correlate well with time-series of solute mixing descriptors.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Geochemistry & Geophysics
A. Mendieta, A. Maineult, P. Leroy, D. Jougnot
Summary: We collected a dataset of spectral induced polarization (SIP) of artificial heterogeneous non-consolidated clay samples in order to better understand the influence of heterogeneities on the geo-electrical signature. Comparing the experimental data with classical mixing laws and complex conductance network models, we found that the mixing laws better predict the real conductivity, while the conductance network models better predict the shape of the spectra (presence of polarization peaks at particular frequencies). This study is important for better characterizing heterogeneous clay systems using SIP.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Luong Duy Thanh, Nguyen Van Nghia, Phan Van Do, Pham Tien Du, Damien Jougnot
Summary: We propose a unified model to describe the permeability, electrical conductivity, and streaming potential coupling coefficient in variably saturated fractured media. By conceptualizing the fractured medium as a partially saturated bundle of parallel capillary slits with varying sizes, we establish a pressure head-saturation relationship based on the fractal scaling law of fracture size distribution. The model explicitly depends on pore water chemistry, interface properties, microstructural parameters of fractured media, and water saturation, and shows good agreement with experimental and simulated data as well as another model from the literature.
GEOPHYSICAL PROSPECTING
(2023)
Article
Geochemistry & Geophysics
Gabriel E. Quiroga, J. German Rubino, Santiago G. Solazzi, Nicolas D. Barbosa, Marco Favino, Klaus Holliger
Summary: The presence of gaseous formation fluids in geothermal reservoirs and their effects on seismic velocities are important for geothermal energy production. This study proposes a poroelastic upscaling approach to accurately describe the physical processes in fractured reservoirs and differentiates changes in fracture density from changes in steam saturation using seismic velocity ratio analyses. The study also shows that Rayleigh-wave-based techniques can differentiate changes in fracture density from changes in steam saturation, and including fluid pressure diffusion effects is crucial for reliable detection and characterization of steam in fractured geothermal reservoirs.
Article
Geochemistry & Geophysics
Andre Revil, Ahmad Ghorbani, Damien Jougnot, Beatrice Yven
Summary: A petrophysical model has been developed to describe the spectral induced polarization (IP) in clay rocks, particularly accounting for the Maxwell-Wagner polarization. The model establishes a connection between complex conductivity and relative permeability of the material. The model was applied to Callovo-Oxfordian clay rocks, and laboratory experiments were conducted to study the effect of desiccation on the spectral-IP response and to analyze other relevant parameters.
Article
Engineering, Chemical
Santiago G. Solazzi, Damien Jougnot, J. German Rubino, Klaus Holliger
Summary: We propose an analytical model to calculate frequency-dependent relative permeability functions for partially saturated porous media, taking into account viscous coupling effects. By considering the oscillatory motion of two immiscible fluid phases and solving the Navier-Stokes equations at the pore scale, we obtain closed analytical expressions for the complex-valued and frequency- and saturation-dependent relative permeability functions. Our results show that viscous coupling effects significantly impact flow characteristics in the viscous and inertial regimes and may induce two critical frequencies in the dynamic relative permeability curves.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Geochemistry & Geophysics
Haoliang Luo, Damien Jougnot, Anne Jost, Jidong Teng, Luong Duy Thanh
Summary: Determining and monitoring liquid water saturation and permeability in saturated frozen porous media are critical issues in cold regions. This study uses geophysical methods to non-invasively determine and monitor liquid water saturation and permeability in frozen porous media. The proposed model successfully predicts the electrical conductivity of frozen soils using different pore size distributions and provides new possibilities for describing the distribution and dynamics of liquid water in frozen environments using geoelectrical and electromagnetic techniques.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Yanbin He, J. German Rubino, Nicolas D. Barbosa, Santiago G. Solazzi, Marco Favino, Tianning Chen, Jinghuai Gao, Klaus Holliger
Summary: Shear wave splitting is a reliable seismic attribute to characterize fractures in geological formations. This study finds that fracture connectivity significantly impacts the magnitude and polarization of shear wave splitting, resulting in a 90-degree rotation. Additionally, the type of fluid within connected fractures does not affect shear wave splitting.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Natalia N. Salva, Gabriel H. Paissan, Santiago G. Solazzi, J. German Rubino
Summary: This study proposes an analytical approach to compute the phase velocity and attenuation of P-waves traveling through parallel fractures. Numerical analysis shows two manifestations of fluid pressure diffusion in these cases. This approach is important for the remote detection and quantification of pore fluids using seismic waves.
GEOPHYSICAL PROSPECTING
(2023)
Review
Environmental Sciences
Bertille Loiseau, Simon D. Carriere, Damien Jougnot, Kamini Singha, Benjamin Mary, Nicolas Delpierre, Roger Guerin, Nicolas K. Martin-StPaul
Summary: This review article discusses how geophysical techniques can contribute to the study of forest ecology, providing new insights into root systems, water dynamics, and spatial heterogeneity in subsurface properties. This multidisciplinary approach offers opportunities for quantitative assessment of biophysical properties and understanding forest response to the environment and climate change.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Thomas Hermans, Pascal Goderniaux, Damien Jougnot, Jan H. Fleckenstein, Philip Brunner, Frederic Nguyen, Niklas Linde, Johan Alexander Huisman, Olivier Bour, Jorge Lopez Alvis, Richard Hoffmann, Andrea Palacios, Anne-Karin Cooke, Alvaro Pardo-Alvarez, Lara Blazevic, Behzad Pouladi, Peleg Haruzi, Alejandro Fernandez Visentini, Guilherme E. H. Nogueira, Joel Tirado-Conde, Majken C. Looms, Meruyert Kenshilikova, Philippe Davy, Tanguy Le Borgne
Summary: This paper discusses the interest and potential for monitoring and characterizing spatial and temporal variability in hydrogeological processes, and proposes a classification of processes and applications at different scales based on high-resolution space-time imaging. The authors call for the validation of 4D imaging techniques at highly instrumented observatories and the harmonization of open databases to share hydrogeological data sets in their 4D components.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Flore Rembert, Marie Leger, Damien Jougnot, Linda Luquot
Summary: In this study, we monitored the electrical conductivity of two limestone core samples during controlled dissolution experiments to better understand the mechanisms responsible for conduits formation and develop detection methods for these processes. We found that constrictivity is more affected by calcite dissolution compared to tortuosity, and the characteristic Johnson length is a valuable structural witness of calcite dissolution impact linking electrical and hydrological properties.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geochemistry & Geophysics
Edith Sotelo, Nicolas D. Barbosa, Santiago G. Solazzi, J. German Rubino, Marco Favino, Klaus Holliger
Summary: The aim of this study is to study the reflectivity response of stratified thin layers in seismic reflection studies using their homogenized viscoelastic equivalents. The estimation of the equivalent moduli is inherently affected by the boundary conditions associated with the embedding background. A novel homogenization procedure is proposed to incorporate the appropriate boundary conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)