Patent ID: 7012426

Claim:
A logging tool conveyed in a borehole for nuclear magnetic resonance (NMR) logging of an earth formation comprising: (a) a housing defining a longitudinal axis of the tool; (b) at least one sensor assembly coupled to the housing by a coupling device, a body of said at least one sensor assembly capable of being close to a wall of a borehole in the earth formation, said sensor assembly including (A) a magnet which provides a static magnetic field in a sensitive region in said formation, (B) a transmitter coil which produces a pulsed radio frequency (RF) magnetic field in said sensitive region, and, (C) at least one receiver coil which receives signals from nuclei in said sensitive region, said at least one receiver coil having an axis substantially parallel to an axis of said transmitter coil wherein an axial extent of the transmitter coil is greater than an axial extent of the at least one receiver coil.