%0 Journal Article
%T Evolution of Seismic Velocities in Heavy Oil Sand Reservoirs during Thermal Recovery Process ¨¦volution des vitesses sismiques dans les r¨¦servoirs de sables bitumineux au cours des proc¨¦d¨¦s de r¨¦cup¨¦ration thermique
%A Nauroy J.-F.
%A Doan D.H.
%A Guy N.
%A Baroni A.
%J Oil & Gas Science and Technology
%D 2013
%I Institut Fran?ais du P¨¦trole
%R 10.2516/ogst/2012027
%X In thermally enhanced recovery processes like Cyclic Steam Stimulation (CSS) or Steam Assisted Gravity Drainage (SAGD), continuous steam injection entails changes in pore fluid, pore pressure and temperature in the rock reservoir, that are most often unconsolidated or weakly consolidated sandstones. This in turn increases or decreases the effective stresses and changes the elastic properties of the rocks. Thermally enhanced recovery processes give rise to complex couplings. 4D seismic surveys are currently conducted to delineate the steam-affected areas but the interpretation is difficult. However, it is essential for optimization of reservoir development. Numerical simulations have been carried out on a case study so as to provide an estimation of the evolution of pressure, temperature, pore fluid saturation, stress and strain in any zone located around the injector and producer wells. The approach of Ciz and Shapiro (2007) (Geophysics 72, A75-A79) has been used to model the velocity dispersion in the oil sand mass under different conditions of temperature and stress. A good agreement has been found between these predictions and some laboratory velocity measurements carried out on samples of Canadian oil sand. Results appear to be useful to better interpret 4D seismic data in order to locate the steam chamber. Dans les proc¨¦d¨¦s de r¨¦cup¨¦ration des huiles lourdes par m¨¦thodes thermiques, comme ia stimulation cyclique par vapeur (CSS) ou le drainage par gravit¨¦ assist¨¦ par vapeur (SAGD), l¡¯injection de vapeur en continu entra ne des changements de liquide de pores, de pression interstitielle et de temp¨¦rature dans la roche r¨¦servoir, qui est constitu¨¦e le plus souvent de sable non consolid¨¦s ou faiblement consolid¨¦s- Ces changements ¨¤ leur tour augmentent ou diminuent les contraintes effectives et modifient les propri¨¦t¨¦s ¨¦lastiques des roches. Les proc¨¦d¨¦s de r¨¦cup¨¦ration par m¨¦thodes thermiques mettent en oeuvre des couplages complexes. Des campagnes de sismique 4D sont couramment effectu¨¦es pour suivre les zones affect¨¦es par la vapeur, mais leur interpr¨¦tation est difficile, Elle est pourtant essentielle pour optimiser le d¨¦veloppement du r¨¦servoir. Des simulations num¨¦riques ont ¨¦t¨¦ r¨¦alis¨¦es sur un cas d¡¯¨¦tude afin de fournir une estimation de l¡¯¨¦volution des pressions, temp¨¦ratures, saturation des fluides interstitiels, contraintes et d¨¦formations dans toute zone situ¨¦e autour des puits injecteur et producteur. L¡¯approche de Ciz et Shapiro (2007) (Geophysics 72, A75-A79) a ¨¦t¨¦ utilis¨¦e pour mod¨¦liser la dispersion de vitesse dans les sables bitumi
%U http://dx.doi.org/10.2516/ogst/2012027