Systems and methods for slice selective nuclear magnetic resonance testing of fractured core plugs to determine in-situ pore volume

摘要

Provided is a local slice selective T2 nuclear magnetic resonance (NMR) test procedure that includes: (1) identifying a location of a fracture within a core plug; (2) conducting an initial local slice selective T2 NMR test on a slice of the plug that corresponds to the location to generate initial T2 measurements; (3) determining an initial fracture pore volume of the fracture based on the initial T2 measurements; (4) conducting an in-situ local slice selective T2 NMR test on the slice of the plug to generate in-situ T2 measurements and corresponding measures of a volume of fluid expelled from the plug; (5) determining an in-situ fracture pore volume for the fracture based on the in-situ T2 measurements; and (6) comparing the volume of water to a difference between the initial and the in-situ fracture pore volumes to confirm the accuracy of the in-situ pore volume.