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Compaction homogène et compaction localisée des roches poreuses.
Etude expérimentale et théorique

Abstract : In many reservoir engineering and tectonic problems, the ability to predict both the occurrence and extent of inelastic compaction and failure hinges upon an understanding of the micromechanics of compaction in reservoir rock. Compaction of porous rock under hydrostatic compression is uniform. At a critical pressure, a large mechanical decrease of porosity is observed. Two different processes are affecting the elastic wave velocities in counteracting ways during inelastic compaction : cracking and porosity decrease. Our result shows that cracking is the dominant effect. To quantitatively interpret these result, an isotropic effective medium was used, considering the sandstone as a mixture of spheroidal pores and penny-shaped cracks. Under axisymmetric compression experiments, compaction is localized. Under low pressure, the mechanical response of the rock is characterized by brittle faulting. In contrast, at higher pressure, we observe that compaction bands develop sub-perpendicular to the main compressive stress. Three-dimensional locations of acoustic emissions (AE) were investigated to analyze the development of compaction bands.
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https://tel.archives-ouvertes.fr/tel-00180388
Contributor : Jerome Fortin <>
Submitted on : Thursday, October 18, 2007 - 7:51:40 PM
Last modification on : Wednesday, November 4, 2020 - 6:00:05 PM
Long-term archiving on: : Sunday, April 11, 2010 - 11:17:51 PM

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  • HAL Id : tel-00180388, version 1

Citation

Jerome Fortin. Compaction homogène et compaction localisée des roches poreuses.
Etude expérimentale et théorique. Géophysique [physics.geo-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00180388⟩

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