Title: Neutron-neutron logging for both porosity and macroscopic absorption cross section

Abstract: A borehole logging tool includes a fast neutron source and at least two thermal neutron detectors spaced apart from the source. A count rate meter is connected to each thermal neutron detector. A ratio detector provides an indication of the porosity of the formation surrounding the borehole by determining the ratio of the outputs of the two count rate meters. A comparison unit provides a signal indicative of the macroscopic absorption cross section of the formation by comparing the indicated porosity with at least one of the count rate signals.

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Inventors: Allen, Linus S. (Dallas, TX, US)

Application Number: 605686
Filing Date: 1975-08-18
Publication_date: 1977-05-03
Assignee: Mobil Oil Corporation (New York, NY)
Primary Class(es): 250/265 250/269.5
Other Classes:
US Patent Ref:

3462600	Aug, 1969	Dewan	250/266.
3491238	Jan, 1970	Allen	250/266.
3567935	Mar, 1971	Nagel	250/264.
3567936	Mar, 1971	Tittman	250/264.
3691378	Sep, 1972	Hopkinson et al.	250/270.
3906224	Sep, 1975	Scott et al.	250/269.
3914603	Oct, 1975	Paap et al.	250/269.

Other Refs:
Primary Examiner: Willis, Davis L.
Assistant Examiner:
Attorney: Huggett; C. A., Hager, Jr.; George W.