VERFAHREN ZUR MESSUNG DER POROSITAET MITTELS EPITHERMISCHER NEUTRONEN

VERFAHREN ZUR MESSUNG DER POROSITAET MITTELS EPITHERMISCHER NEUTRONEN

Earth formations penetrated by a borehole are irradiated with pulses of fast neutrons. The epithermal neutrons resulting from moderation of the fast neutrons are detected in a plurality of time intervals to determine the porosity of the adjacent earth formations independently of lithology. Statistic...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: VERBOUT, JERRY LEE, SMITH, HARRY DAVIS, JR
Format: Patent
Sprache:eng ; ger
Schlagworte:
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:Earth formations penetrated by a borehole are irradiated with pulses of fast neutrons. The epithermal neutrons resulting from moderation of the fast neutrons are detected in a plurality of time intervals to determine the porosity of the adjacent earth formations independently of lithology. Statistical results are improved by taking the ratio of the count rate during build-up of the epithermal neutron population to the count rate during die-away.