FIELD: mining.
SUBSTANCE: invention relates to a transversal-dipole antenna configuration for downhole nuclear magnetic resonance (NMR) based devices, for example, for obtain NMR data from a subterranean region. Nuclear magnetic resonance (NMR) tool for use in a wellbore in a subterranean region, comprising: a magnet assembly to produce a magnetic field in a volume in a subterranean region, comprising: a central magnet having a first axial end and a second, opposite axial end; a first end piece magnet spaced apart from the first axial end of the central magnet, and a second end piece magnet spaced apart from the second axial end of the central magnet, an antenna assembly comprising mutually perpendicular transversal-dipole antennae for producing circular polarised excitation in the volume.
EFFECT: device NMR for use in a well in a subterranean region is disclosed.
20 cl, 4 dwg
