Carbonate reservoirs are heterogeneous systems at multiple length-scales, a characteristic that influences strongly their petrophysical properties and oil recovery procedures [1]. Wettability for example, capillary pressure as a function of water saturation, and partial permeability, are related with the pore structure (pore size and shape) and the rock mineralogy [2, 3]. Acid stimulation treatments are available, which can improve productivity [4, 5, 6]. It is expected that acid stimulation treatment, which opens rock porous channels known as wormholes, will influence strongly the pore structure and therefore petrophysical properties around the wormholes, decreasing wettability and thus increasing oil recovery.

In this work we study the role of the pore structure on the water and oil absorption in a number of acidized and non-acidized carbonate cores by employing 1H NMR.


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