Abstract: A measurement tool, primarily for use in a bore hole, has a neutron source located within a housing and a neutron-based detector located within the housing. At least one of the neutron source and the neutron-based detector offset from a longitudinal axis of rotation. The axially offset neutron source or neutron-based detector allow directional measurements to be made of the formations surrounding the bore hole by rotating the tool within the bore hole.

Abstract: A method for evaluating a characteristic of a formation adjacent a wellbore comprises emitting a neutron field into the formation from a neutron source, obtaining data comprising a long neutron neutron (LNN), short neutron neutron (SNN), long neutron gamma (LNG) and short neutron gamma data (SNG) from the neutron field emitted into the formation and combining the long data with the short data to reduce error associated with the characteristic to be evaluated. A detector for evaluating a characteristic of a formation includes a neutron source and detectors for detecting LNN, SNN, LNG, SNG.

Abstract: A multi-source neutron logging tool has been developed. The multi-source logging tool comprises axially aligned gamma and thermal neutron detectors on either side of a multi-neutron source. The multi-source neutron logging tool may be used to evaluate formations adjacent a borehole.

Abstract: A multi-source neutron logging tool has been developed. The multi-source logging tool comprises axially aligned gamma and thermal neutron detectors on either side of a multi-neutron source. The multi-source neutron logging tool may be used to evaluate formations adjacent a borehole.

Abstract: A measurement tool, primarily for use in a bore hole, has a neutron source located within a housing and a neutron-based detector located within the housing. At least one of the neutron source and the neutron-based detector offset from a longitudinal axis of rotation. The axially offset neutron source or neutron-based detector allow directional measurements to be made of the formations surrounding the bore hole by rotating the tool within the bore hole.

Abstract: A method for evaluating a characteristic of a formation adjacent a wellbore comprises emitting a neutron field into the formation from a neutron source, obtaining data comprising a long neutron neutron (LNN), short neutron neutron (SNN), long neutron gamma (LNG) and short neutron gamma data (SNG) from the neutron field emitted into the formation and combining the long data with the short data to reduce error associated with the characteristic to be evaluated. A detector for evaluating a characteristic of a formation includes a neutron source and detectors for detecting LNN, SNN, LNG, SNG.