000			03011nab a2200241 4500
005			20260520003102.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aImpact of Fractures on CO2 Storage Monitoring: Keys for an Integrated Approach
260			_a _b _cmar./abr. 2012
270			_a27/05/2013 ; 27/05/2013
300			_a9 p. ; 319-328
520			_aTraducción del resúmen del autor: The monitoring of CO2 storage in fractured reservoirs (depleted hydrocarbon fields or brine aquifers) requires the study of the impact of fracturation and fluid substitution on seismic data. Seismic data can provide information about the additional compliance due to the fractures and the fluids through the analysis of seismic azimuthal anisotropy with an appropriate rock physics model. We introduce a rock physics model built in collaboration with geologists, providing a realistic description of fractured media. This model concerns fractured geological media in the presence of fluids characterized by some degree of matrix porosity, the presence of pore fluids, connected and/or non-connected fractures, the presence of several fracture sets, and an inherent seismic anisotropy. The direct application of this rock model shows that the P-wave anisotropy value measured through seismic data can be explained by several sets of different parameters such as the fracture density, the pore fluid compliance or the porosity. The presence of inherent layer-induced anisotropy can also modify the P-wave anisotropy and thus the interpretation of this value in terms of fluid substitution in a fractured porous medium. As far as fluid substitution monitoring is concerned, if seismic data are acquired before and after this substitution, a change in the P-wave anisotropy value can be linked to the modification of the compliance of the fluid content in the same medium exhibiting the same fracture network and the same porosity. This relative value can only be correctly interpreted in terms of fluid substitution provided we have some constraints on a few of the parameters involved in the P-wave anisotropy value such as the porosity, and a rough idea of the level of normalized fracture compliance. Then, a multidisciplinary approach is mandatory to constrain these parameters. For instance, borehole and outcrop geological information can give the upper limit of the fracture density expected at depth in the same formation. Furthermore, rock mechanics helps in understanding the fracturation state at depth to identify the predominant fractures in regard to the interpretation of seismic anisotropy in terms of fluid substitution inside the fracture network.
581			_a2
773	0		_tOil and Gas Science and Technology _g67
942			_cARTICULO
100	1		_aDubos-Sallée, N. _953224
100	1		_aRasolofosaon, P.N.J. _953223
100	1		_aBecquey, M. _946751
100	1		_aPutot, C. _912533
100	1		_aZinszner, B. _923787
999			_c187710 _d187710