Patent ID: 9671525
Date: 2017-06-06
CPC Classifications: G01V,Y02A

Claim:
1. A computer implemented method of obtaining measures in a data processing system of capillary pressure of pore systems in formation rock adjacent a well in a subsurface reservoir at a formation depth point of interest in the well, the method comprising the computer processing steps of: (a) receiving nuclear magnetic resonance well log data comprising transverse relaxation time amplitude distribution obtained from the formation by a nuclear magnetic resonance log of the well at the formation depth point of interest; (b) receiving resistivity well log data regarding the water saturation of the formation from measurements obtained from the formation by a resistivity well log of the well at the formation depth point of interest; (c) obtaining a measure of water saturation of the formation from the received resistivity well log data at the formation depth point of interest; (d) determining an initial measure of capillary pressure of the formation at the formation depth point of interest based on the received transverse relaxation time amplitude distribution; (e) performing a calibration of the initial measure of capillary pressure of the formation to a reference capillary pressure of the formation rock at the depth point of interest, the calibration being perform based on the measure of water saturation obtained from the received resistivity well log data from the formation at the depth point of interest; (f) forming a model of capillary pressure as a function of water saturation at the formation at the depth of interest; (g) testing the model of capillary pressure, and if the model of capillary pressure is acceptable, storing the tested model capillary pressure as the capillary pressure of the formation pore systems at the depth of interest; and (h) forming an output display of the accepted capillary pressure of the formation pore systems at the depth of interest for reservoir simulation.