Patent ID: 8452538
Filing Date: 2013-05-28
Classification: G01V

Abstract:
1. A method for evaluating petrophysical properties of a subterranean formation comprising the steps of: receiving a sonic log, the sonic log having a plurality of sonic measurements at a plurality of wellbore depths; receiving an electrical resistivity log, the electrical resistivity log having a formation resistivity measurement at each wellbore depth; receiving a gamma ray log, the gamma ray log having a gamma ray measurement at each wellbore depth; receiving a neutron porosity log, the neutron porosity log having a neutron porosity measurement (N receiving a density log, the density log having a bulk density measurement (ρ determining a set of volumes, wherein the set of volumes comprise a hydrate volume (V determining a second shale volume (V determining a sonic porosity (DT determining a calculated bulk density (ρ determining a density porosity (D determining an apparent water resistivity (R determining one of a water saturation (S receiving an NMR log, the NMR log having an NMR porosity measurement (NMR determining an NMR hydrate saturation (S wherein wherein ρ hydrate is a hydrate density at each wellbore depth, wherein ρ matrix is a matrix density, and wherein ρ fluid is a formation fluid density; and determining a sonic hydrate saturation (S