Dual Neutron Probe

By: GeoLog Pty Ltd  04-Jul-2012
Keywords: Logging

The dual neutron probe provides an accurately calibrated borehole-compensated neutron porosity measurement in mud-filled open holes. It is the probe of choice for quantitative formation-fluid studies, including shallow oil and gas prospects. Principles of Measurement The dual neutron measurement uses two 3He proportional detectors and a detachable, sealed neutron source. Fast neutrons emitted by the source are scattered and slowed by light elements (and principally hydrogen in the formation) until they reach thermal energy levels. The ratio of the flux of thermal neutrons reaching the near and far detectors depends on the Hydrogen Index and porosity. Use of the two detectors and a ratio method provides a porosity measurement which is independent of borehole size over a range of hole diameters. Features Wide porosity range (0 to 60% sandstone equivalent) Compensation for borehole diameter using dual detectors Real-time porosity measurement with Videologger and Micrologger systems Option of natural gamma for correlation Option of CCL for casing inspection Measurements Compensated porosity Raw long-spaced neutron Raw short-spaced neutron Count ratio Natural gamma Casing collar locator

Keywords: Logging

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