000			01983nab a2200205 4500
005			20260520002931.0
008			260224s2010 xxu
245	0	0	_aEvaluating sealing efficiency of caprocks for CO2 storage: an overview of the geocarbone-integrity program and results
260			_a _b _cmayo/jun. 2010
270			_a31/08/2010 ; 31/08/2010
300			_a10 p. ; 431-440
520			_aTranscripción del resumen del autor. An overview of the three-year program and results of the Geocarbone-Integrity French project is given. It focused on the development of experimental and numerical methodologies to assess the integrity of underground CO2 storage at various scales. The primary criteria in the selection of a caprock formation for CO2 storage purposes are the thickness and permeability of the formation. Local and limited migration of CO2 into the caprock due to insufficient capillary entry pressure has been studied as a probable scenario. At a large scale, caprock characterization requires at least seismic profiles to identify lateral continuity. When well-logging data are available, simple rules based on clay content can be used to estimate thicknesses. For the formation considered, the geochemical reactivity to CO2 was small, making the reaction path difficult to identify. Similarly, artificial alterations of samples representing extreme situations had little impact on geomechanical properties. Finally, with realistic overpressure due to injection, shear fracture reactivation criteria are not reached and migration of CO2 either by diffusion or by two-phase flow within the first meters of the caprock produce mostly a decrease in porosity by precipitation, and very locally an increase in porosity by dissolution.
581			_a3
773	0		_tOil and Gas Science and Technology _g65
942			_cARTICULO
100	1		_aFleury, M. _912561
100	1		_aPironon, J. _936701
100	1		_aLe Nindre, Y.M. _946737
999			_c176579 _d176579