f SENSITIVITY OF BOREHOLE NMR MEASUREMENTS TO WELL CONSTRUCTION AND DEVELOPMENT

In this work we investigate the effect of different well construction methods, and well development activities, on borehole NMR measurements and borehole-NMRderived estimates of hydraulic conductivity. Nuclear magnetic resonance (NMR) measurements provide direct sensitivity to pore fluids enabling estimation of key petrophysical properties including porosity, bound/free fluid content, and permeability. In particular, the observed NMR relaxation time T2 is sensitive to the pore volume to surface ratio. Hence, any differences or changes in the physical pore-scale properties of a water-saturated formation due to well construction and/or development should logically be detectable by borehole NMR. To test this hypothesis, we used a variety of small diameter NMR logging tools at a wellcharacterized hydrologic test site in Lawrence Kansas.