Water saturation and sand fraction determination from...

G - Physics – 01 – V

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G01V 3/18 (2006.01) G01V 3/28 (2006.01) G01V 11/00 (2006.01)

Patent

CA 2358124

The total porosity the formation, (13), including a fractional volume of the shale (13), and a resistivity of the shale are determined (22), in a laminated reservoir including sands that may have dispersed shales therein. A tensor petrophysical model determines the laminar shale volume and laminar sand conductivity from vertical and horizontal conductivities derived from multi-component induction log data (10). The volume of dispersed shale and the total and effective porosities of the laminar sand fraction are determined using a Thomas-Stieber-Juhasz approach. Removal of laminar shale conductivity and porosity effects reduces the laminated shaly sand problem to a single dispersed shaly sand model to which the Waxman-Smits equation can be applied.

L'invention concerne un procédé permettant de déterminer (22) la porosité totale d'une formation (13), un volume fractionnel du schiste dans ladite formation (13) ainsi que la résistivité dudit schiste, dans un réservoir stratifié comprenant des sables dans lesquels du schiste peut être dispersé. Un modèle pétrophysique tensoriel permet de déterminer le volume de schiste laminaire et la conductivité du sable laminaire à partir des conductivités verticale et horizontale déduites des données (10) multi-composant de la diagraphie par induction. Le volume du schiste dispersé et les porosités totale et effective de la fraction de sable laminaire sont déterminés à l'aide de la technique Thomas-Stieber-Juhasz. L'élimination de la conductivité du schiste laminaire et des effets de la porosité permet de ramener les problèmes posés par le sable schisteux laminaire à un seul modèle de sable schisteux dispersé auquel on peut appliquer l'équation de Waxman-Smits.

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