... level relaxation time distribution heavy oil SPWLA 52nd Annual Logging Symposium, May 14-18, 2011 1 VISCOSITY EVALUATION FOR NMR WELL LOGGING OF LIVE HEAVY OILS Zheng Yang a, George J. Hirasaki a Matthias Appel b, Daniel A. Reed b a Department of Chemical and Biomolecular Engineering, Rice...

... relaxation time distribution log analysis Upstream Oil & Gas heterogeneity sandstone flow in porous media spwla 48 porosity Eqn arn Symposium carbonate relaxation time voxel mri voxel mean relaxation time variogram permeability SPWLA 48th Annual Logging Symposium, June 3-6, 2007...

... as a porosity tool, it has the ability to apportion the porosity into different components. In chalks with their uniform pore-size distribution the measured relaxation time distributions often can be separated into the water- and oil-filled pore volumes. These previous studies indicated that NMR-based porosity...

... that in diffusivity wettability change diffusion coefficient Symposium log analysis diffusion time base oil Hürlimann relaxation time well logging information coefficient diffusion interpretation Upstream Oil & Gas field gradient echoe relaxation time distribution wettability saturation...

... as mixtures of methane and n-decane) have a relaxation time dependence on viscosity/temperature that deviates from the correlation based on hydrocarbon liquids at ambient conditions. The estimation of BVI assumes that the relaxation time distribution below the T2 cutoff is due to capillary-bound water...

... to the porosity and pore size terms in the permeability algorithms. The presence of gas with its low hydrogen index in the logging tools? sensitive region reduces the NMR porosity and alters the relaxation time distribution. The porosity loss can be corrected by replacing the NMR porosity with a Density-Neutron...