Pore characterization and clay bound water assessment in shale with a combination of NMR and low-pressure nitrogen gas adsorption

Pore size distribution (PSD) and the volume of clay bound water (CBW) are crucial parameters for gas shale reservoirs formation evaluation. Low-field nuclear magnetic resonance (LF-NMR) has been extensively applied to characterize petrophysical properties of reservoirs. However, limited understanding remains for unconventional shales. Defining NMR T2 cutoff to differentiate CBW from free water is a challenge in shales since conventional...