Patent ID: 8373412
Filing Date: 2013-02-12
Classification: G01V

Abstract:
1. An apparatus for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the apparatus comprising: a logging tool; a source of a static magnetic field, the source being disposed at the logging tool and configured to polarize the region of investigation in the earth formation; a transmitter antenna disposed at the logging tool and configured to transmit electromagnetic energy into the region of investigation; a first receiver sensor disposed at the logging tool and configured to receive first NMR signals in an azimuthal direction with respect to a longitudinal axis of the logging tool from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; a second receiver sensor disposed at the logging tool and configured to receive second NMR signals in an azimuthal direction with respect to the longitudinal axis of the logging tool from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; and a processor configured to: