Patent ID: 7555390
Filing Date: 2009-06-30
Classification: A61B,A61F,G01V

Abstract:
1. A method of producing a log of a characteristic of a formation surrounding a borehole, comprising: a) moving a resistivity logging tool through the borehole a plurality of times to obtain each time resistivity measurements at a plurality of radial depths of investigation for a plurality of borehole distances; b) utilizing said resistivity measurements, generating starting estimates of residual oil saturation S c) utilizing said starting estimates and said resistivity measurements, conducting an initial global multidimensional search for starting values of residual water saturation S d) utilizing said starting values of residual water saturation, finding starting values for maximum residual oil saturation S e) using said starting values of connate water saturation S f) displaying an indication of a value of said at least one formation parameter as a log over borehole distance.