Patent ID: 7642774
Filing Date: 2010-01-05
Classification: G01N,G01V

Abstract:
1. A method for determining saturation of a conducting fluid as a function of resistivity in a porous medium initially saturated with the conducting fluid, comprising: a) extracting at least a first solid sample from the medium; b) placing the first sample into a centrifugation cell, beside a second solid sample which limits a capillary end effect in the first sample, the samples being arranged next to one another in order to optimize capillary contact therebetween; c) partly desaturating the first and second samples by centrifugation of the samples in the centrifugation cell with a rotating speed and rotation time allowing desaturation of the first sample; d) measuring resistivity of at least the first sample by placing at least the first sample in a resistivity measurement cell and providing an electrical current using at least a first pair of electrodes and measuring an electrical potential between at least a second pair of electrodes, the first and second pairs of electrodes being radially disposed around at least the first sample; e) determining fluid saturation of at least the first sample by measuring a nuclear magnetization of the first sample using a Nuclear Magnetic Resonance (NMR) device; and f) repeating steps b) to e) while modifying the rotating speed of the centrifugation cell in order to obtain pairs of resistivity and saturation values for at least the first sample; and g) using the pairs of resistivity and saturation values for estimating a relationship between the saturation and the resistivity value of at least the first sample.