| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Fabricius, Ida Lykke
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2022Strain modeling in a marly chalk reservoir
- 2022Effect of Pyrite in Water Saturation Evaluation of Clay-Rich Carbonatecitations
- 2020Porosity in chalk – roles of elastic strain and plastic straincitations
- 2019Influence of temperature cycling and pore fluid on tensile strength of chalkcitations
- 2017Low-Field NMR Spectrometry of Chalk and Argillaceous Sandstones: Rock-Fluid Affinity Assessed from T-1/T-2 Ratio
- 2016Wettability of Chalk and Argillaceous Sandstones Assessed from T1/T2 Ratio
- 2014Burial stress and elastic strain of carbonate rockscitations
- 2011Petrophysical properties of greensand as predicted from NMR measurementscitations
- 2010Biot Critical Frequency Applied to Description of Failure and Yield of Highly Porous Chalk with Different Pore Fluidscitations
- 2008Chalk porosity and sonic velocity versus burial depthcitations
- 2007Elastic behaviour of North Sea chalkcitations
- 2000BET measurements: Outgassing of mineralscitations
Places of action
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document
Wettability of Chalk and Argillaceous Sandstones Assessed from T1/T2 Ratio
Abstract
Low-field NMR relaxation of the fluids inside the porous rock is the result of bulk and surface relaxation of the protons inside the pore fluid. Bulk relaxation is a fluid property when the solid-fluid interaction is minimized. Surface relaxation is the result of the solid-fluid interaction related to mineral properties. Thus, longitudinal, T1, and transverse, T2, relaxation times should in principle be similar. However, microscopic magnetic gradients related to minerals can shorten T2 as compared to T1 provided the saturating fluid has high affinity to the solid. We consequently find that the T1/T2 ratio can quantify the affinity between the rock and wetting pore fluid. The affinity is a measure directly linked to wettability.<br/>In order to investigate the T2-shortening, we performed T1-T2 NMR experiments on different samples of chalk, Berea sandstone, and chloritic greensand, saturated either with water, oil or oil/water at irreducible water saturation. The T1/T2 ratio obtained from T1-T2 maps reflects theT2-shortening. We compare the T1/T2 ratio for the same type of rock, saturated with different fluids. The chalk shows high affinity for water, Berea sandstone has no clear preference for oil and water whereas chloritic greensand shows different behavior for small and large pores