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Updated: Sep 12, 2026

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
Interpretation of restricted diffusion in sandstones with internal field gradients
M Appel1, J J Freeman, J S Gardner
1Shell International Exploration & Production, Inc., 3737 Bellaire Blvd, Houston, TX, USA. appel@shellus.com
Abstract:
We report on experiments to characterize internal magnetic field gradients that are caused by magnetic susceptibility differences between the solid phase and the fluids filling the pore space. Our measurements focus on low-field relaxometry of brine and oil in sandstones from various reservoirs around the world. Our results show the need to understand the dependence of internal field gradients on diffusion length, pore size- and fluid distribution in order to predict the impact of internal gradients on the interpretation of NMR experiments.
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