2015
DOI: 10.1002/2014jb011631
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Porosity and permeability development in compacting chalks during flooding of nonequilibrium brines: Insights from long‐term experiment

Abstract: We report the complete chemical alteration of a Liège outcrop chalk core resulting from a 1072 flow-through experiment performed during mechanical compaction at 130°C. Chemical rock-fluid interactions alter the volumetric strain, porosity, and permeability in a nontrivial way. The porosity reduced only from 41.32% to 40.14%, even though the plug compacted more than 25%. We present a novel analysis of the experimental data, which demonstrates that the geochemical alteration does not conserve the volume of the s… Show more

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Cited by 40 publications
(64 citation statements)
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“…These predictions have been supported by direct XRD and SEM observations that were published recently by Zimmermann et al [21]. As such, calculations and direct rock-observations have shown that chalk is prone to chemical rock-fluid reactions at high temperatures [17].…”
Section: Introductionmentioning
confidence: 56%
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“…These predictions have been supported by direct XRD and SEM observations that were published recently by Zimmermann et al [21]. As such, calculations and direct rock-observations have shown that chalk is prone to chemical rock-fluid reactions at high temperatures [17].…”
Section: Introductionmentioning
confidence: 56%
“…The porosity estimate from mass difference measurements was performed both before and after the experiment. Based on previous experience in related geochemistry, pycnometry, saturation and dry mass estimates, the porosity of connected pores is equal to the overall porosity of the chalk sample [17]. Helium gas pycnometer measurements, using the Micromeritics Gas Pycnometer model AccuPyc II 1340, were also employed to estimate the solid density ρ s of tested and un-tested material.…”
Section: The Chalkmentioning
confidence: 99%
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