Abstract
Methods for improving measurement accuracy of formation resistivity factor (F) has been studied for nine shale samples from the Venture Gas Field, offshore Nova Scotia. F is one of the petrophysical parameters that provides information on shale seal quality for hydrocarbon exploration. It is determined by measuring electrical resistivity (prn) for samples saturated with NaCl solutions with different resistivities (pw) and inserting the values into the Patnode and Wyllie Equation: 1/prn = 1/(Fpw) + 1/pc, where pc is the pore surface resistivity. According to this equation, the relationship between 1/pr and 1/pw should be linear. Cases where deviation from linearity occur cause concern over measurement accuracy. A previous study suggested that the problem is eliminated by using NaCl solutions with high concentrations and long saturation times. Adopting this method solves the problem for six of the nine samples. The remaining three coincide with those that have minor amounts of kaolinite.
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