| 摘要 |
A logging assembly for application in a wellbore formed in an earth formatio n is provided. The assembly comprises a casing suitable to be lowered through the wellbore and to be arranged in a selected part thereof, and an NMR logging device comprising magnetising means for inducing a magnetic field into a selected zone of the earth formation, antenna means for transmitting radio-frequency (RF) signals into the selected zone and for receiving response RF signals from the selected zone, and data collecting means for collecting data representing the response RF signals, which data collecting means is removably arranged i n the interior of the casing. The means for inducing the magnetic field includes a magnetised section of the casing.
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