diffusion — Oil & Gas Glossary
The process by which particles move over time within a material due to their kinetic motion. The term is most commonly used in pulsed neutron capturelogging and in nuclear magnetic resonance (NMR) logging. In a pulsed neutron capture log, the term refers to the spread of neutrons away from the neutron generator. In NMR logging, diffusion refers to the movement
Detailed Explanation
of gas, oil or water molecules within the pore space.