Modification of the SDR equation for permeability prediction

We evaluate the potential of permeability prediction original and modified versions Schlumberger-Doll Research (SDR) equation that is applied to data nuclear magnetic resonance (NMR) relaxometry. Different definitions characteristic relaxation time are considered. In a further modification, pore radius replaces in SDR equation. Only good estimate surface relaxivity enables reliable transformation from distribution (RTD) into (PRD). A recently published approach considers specific area per unit volume ( S por ) weighted harmonic mean T 2hm RTD for determination an individual value each sample. The evaluation performed three sample sets originating different sandstone formations. predictive quality confirmed. However, prefactors have be adjusted by calibrating with core data. demonstrate use average radii instead times better prediction. PRD, which proves proxy effective hydraulic radius, provides high