Combined Capillary Pressure and Resistivity Index Measurements in Tight Gas Sands Using Vapor Desorption Method

This paper presents work on laboratory advances that have been developed to measure capillary pressure and electrical property measurements under low water saturation conditions. The paper discusses in some detail the various capillary pressure techniques utilized in the oil and gas industry and gives some insights on the Kelvin equation's applicability in tight gas sands. Detailed comparisons are shown between vapor desorption capillary pressure and mercury injection data a saturation offset that could be attributed to the non-wetting nature of the fluids and possible rock matrix alteration. The proposed calibration of the mercury data on tight sands is then considered for tight gas carbonate reservoirs.