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Investigating spatial heterogeneity within fracture networks using hierarchical clustering and graph distance metrics

Prabhakaran, R. (author), Bertotti, G. (author), Urai, Janos (author), Smeulders, D.M.J. (author)

Rock fractures organize as networks, exhibiting natural variation in their spatial arrangements. Therefore, identifying, quantifying, and comparing variations in spatial arrangements within network geometries are of interest when explicit fracture representations or discrete fracture network models are chosen to capture the influence of...

journal article 2021

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Reactive Grand-Canonical Monte Carlo Simulations for Modeling Hydration of MgCl₂

Heijmans, K. (author), Tranca, Ionut C. (author), Chang, Ming Wen (author), Vlugt, T.J.H. (author), Gaastra-Nedea, Silvia V. (author), Smeulders, David M.J. (author)

Thermochemical heat-storage applications, based on the reversible endo-/exothermic hydration reaction of salts, are intensively investigated to search for compact heat-storage devices. To achieve a truly valuable storage system, progressively complex salts are investigated. For these salts, the equilibrium temperature and pressure conditions...

journal article 2021

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Large-scale natural fracture network patterns: Insights from automated mapping in the Lilstock (Bristol Channel) limestone outcrops

Prabhakaran, R. (author), Urai, J. L. (author), Bertotti, G. (author), Weismüller, C. (author), Smeulders, D.M.J. (author)

The Lilstock outcrop in the southern Bristol Channel provides exceptional exposures of several limestone beds displaying stratabound fracture networks, providing the opportunity to create a very large, complete, and ground-truthed fracture model. Here we present the result of automated fracture extraction of high-resolution photogrammetric...

journal article 2021

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Gibbs Ensemble Monte Carlo for Reactive Force Fields to Determine the Vapor-Liquid Equilibrium of CO₂and H₂O

Heijmans, Koen (author), Tranca, Ionut C. (author), Smeulders, David M.J. (author), Vlugt, T.J.H. (author), Gaastra-Nedea, Silvia V. (author)

Absorption and reactive properties of fluids in porous media are key to the design and improvement of numerous energy related applications. Molecular simulations of these systems require accurate force fields that capture the involved chemical reactions and have the ability to describe the vapor-liquid equilibrium (VLE). Two new reactive...

journal article 2021

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Soft Layer: A work of art by Toshitaka Nishizawa for the Mijnbouwkundige Vereeniging

Jansen, J.D. (author), Blom, J.C. (author), Free, Renske (author), Kouwenhoven, Paula (author), Fokkema, J.T. (author), de Bruijn, Birgit (author), Smeulders, Julien (author), Drenth, D.J.H. (author), van der Kleijn, Piet Hein (author)

This booklet provides additional information to the work of art 'Soft Layer' located in front of the faculty of Civil Engineering and Geosciences. This piece of art is an initiative of students and alumni of the Mijnbouwkundige Vereeniging and has been revealed on the 24th of February, 2020.

other 2020

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Energy quay walls

Haasnoot, Jacco (author), Vardon, P.J. (author), Pantev, I.A. (author), Bersan, Silvia (author), Bloemers, Bob (author), Smeulders, David (author)

In the Netherlands and other countries around the world there are extensive canals and rivers with banks supported by walls. Especially in the historic inner cities of the Netherlands, quay walls currently need to be replaced. During construction, temporary valuable underground space is created that can be used to accommodate energy...

journal article 2020

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An automated fracture trace detection technique using the complex shearlet transform

Prabhakaran, R. (author), Bruna, P.B.R. (author), Bertotti, G. (author), Smeulders, D.M.J. (author)

Representing fractures explicitly using a discrete fracture network (DFN) approach is often necessary to model the complex physics that govern thermo-hydro-mechanical-chemical processes (THMC) in porous media. DFNs find applications in modelling geothermal heat recovery, hydrocarbon exploitation, and groundwater flow. It is advantageous to...

journal article 2019

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A Numerical Study on the Effect of Anisotropy on Hydraulic Fractures

Valliappan, Valliappan (author), Remmers, J. J.C. (author), Barnhoorn, A. (author), Smeulders, D.M.J. (author)

In this paper, we present a two-dimensional numerical model for modelling of hydraulic fracturing in anisotropic media. The numerical model is based on extended finite element method. The saturated porous medium is modelled using Biot’s theory of poroelasticity. An enhanced local pressure model is used for modelling the pressure within the...

journal article 2017

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Handreiking opdrachtgeverschap: Inleiding en praktijk voor toezichthouders

Drijver, Margriet (author), Hermans, M.H. (author), Smeulders, Tom (author), Spek, Emile (author)

Woningcorporaties zijn in belangrijke mate afhankelijk van externe partijen bij het uitvoeren van hun taken.<br/>Een gemiddelde woningcorporatie werkt met tientallen verschillende opdrachtnemers. Die worden bijvoorbeeld ingeschakeld voor onderhoud, nieuwbouw en beheer, maar ook voor ICT-taken, accountancy, juridisch advies en andere vormen van...

report 2017

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Featureless: Bypassing feature extraction in action categorization

Pintea, S. (author), Mettes, Pascal (author), van Gemert, J.C. (author), Smeulders, AWM (author)

This method introduces an efficient manner of learning action categories without the need of feature estimation. The approach starts from low-level values, in a similar style to the successful CNN methods. However, rather than extracting general image features, we learn to predict specific video representations from raw video data. The benefit...

conference paper 2016

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Signature of seismic wave attenuation during fracture network formation

Barnhoorn, A. (author), Zhubayev, A. (author), Houben, M. (author), Hardebol, N.J. (author), Smeulders, D.M.J. (author)

journal article 2015

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Ultrasonic velocity and attenuation anisotropy of shales, Whitby, United Kingdom

Zhubayev, A. (author), Houben, M.E. (author), Smeulders, D.M.J. (author), Barnhoorn, A. (author)

We have conducted ultrasonic experiments, between 0.3 and 1 MHz, to measure velocity and attenuation (Q?1) anisotropy of P- and S-waves in dry Whitby Mudstone samples as a function of stress. We found the degree of anisotropy to be as large as 70% for velocity and attenuation. The sensitivity of P-wave anisotropy change with applied stress is...

journal article 2015

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Shock-induced wave propagation over porous and fractured borehole zones: Theory and experiments

Fan, H. (author), Smeulders, D.M.J. (author)

Borehole waves are strongly affected by adjacent porous zones or by fractures intersecting the borehole. A theoretical description for both porous and fracture zones is possible based on the introduction of an effective borehole fluid bulk modulus, characterizing the wave attenuation via borehole wall impedance. This impedance can be calculated...

journal article 2013

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Electrokinetic fields and waves: Theory, experiments and numerical modeling

Grobbe, N. (author), Schoemaker, F.C. (author), Schakel, M.D. (author), De Ridder, S.A.L. (author), Slob, E.C. (author), Smeulders, D.M.J. (author)

conference paper 2012

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Shock-induced borehole waves and fracture effects

Fan, H. (author), Smeulders, D.M.J. (author)

journal article 2012

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Experimental validation of the electrokinetic theory and development of seismoelectric interferometry by cross-correlation

Schoemaker, E.C. (author), Grobbe, N. (author), Schakel, M.D. (author), De Ridder, S.A.L. (author), Slob, E.C. (author), Smeulders, D.M.J. (author)

We experimentally validate a relatively recent electrokinetic formulation of the streaming potential (SP) coefficient as developed by Pride (1994). The start of our investigation focuses on the streaming potential coefficient, which gives rise to the coupling of mechanical and electromagnetic fields. It is found that the theoretical amplitude...

journal article 2012

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Medium characterization from interface-wave impedance and ellipticity using simultaneous displacement and pressure measurements

Van Dalen, K.N. (author), Drijkoningen, G.G. (author), Smeulders, D.M.J. (author), Heller, H.K.J. (author), Glorieux, C. (author), Sarens, B. (author), Verstraeten, B. (author)

The interface-wave impedance and ellipticity are wave attributes that interrelate the full waveforms as observed in different components. For each of the fluid/elastic-solid interface waves, i.e., the pseudo-Rayleigh (pR) and Stoneley (St) waves, the impedance and ellipticity are found to have different functional dependencies on Young’s modulus...

journal article 2011

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Seismoelectric fluid/porous-medium interface response model and measurements

Schakel, M.D. (author), Smeulders, D.M.J. (author), Slob, E.C. (author), Heller, H.K.J. (author)

Coupled seismic and electromagnetic (EM) wave effects in fluid-saturated porous media are measured since decades. However, direct comparisons between theoretical seismoelectric wavefields and measurements are scarce. A seismoelectric full-waveform numerical model is developed, which predicts both the fluid pressure and the electric wavefields in...

journal article 2011

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Shock-Induced Borehole Waves and Fracture Effects

Fan, H. (author), Smeulders, D.M. (author)

We perform wave experiments using a vertical shock tube setup. Shock waves are generated by the rupture of a thin membrane. In the test section, the incident pressure waves generate borehole-guided waves along water-saturated samples. The tube is equipped with side wall gages and a mobile pressure probe, so that the attenuation and reflection of...

journal article 2011

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Seismoelectric interface response: Experimental results and forward model

Schakel, M.D. (author), Smeulders, D.M.J. (author), Slob, E.C. (author), Heller, H.K.J. (author)

Understanding the seismoelectric interface response is important for developing seismoelectric field methods for oil exploration and environmental/engineering geophysics. The existing seismoelectric theory has never been validated systematically by controlled experiments. We have designed and developed an experimental setup in which acoustic-to...

journal article 2011