| 摘要 |
An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus includes: a carrier configured to be conveyed through the borehole; a nuclear magnetic resonance (NMR) instrument disposed at the carrier and configured to perform an NMR measurement on a volume sensitive to the NMR measurement; and a contrast agent disposed in the volume and comprising particles that form a suspension in a liquid, the suspension of particles being configured increase a magnetic field gradient of at least one earth formation material in the volume to change an NMR relaxation time constant of the at least one earth formation material; wherein the NMR measurement on the volume containing the at least one earth formation material and the contrast agent is used to estimate the property. |
