Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1980-10-31
1983-09-13
Smith, Alfred E.
Radiant energy
Coded record and readers; invisible radiant energy type
250269, G01V 510
Patent
active
044044674
ABSTRACT:
In the illustrative embodiments of the invention disclosed, the lithology and salinity of an earth formation traversed by a well bore are investigated by irradiating the formation with a neutron source and generating an energy spectrum of the activation gamma rays resulting therefrom. From the spectrum thus obtained, the level of the activation gamma radiation emitted by .sup.24 Na and that emitted by .sup.38 Cl are determined. The two intensity measurements are then combined, e.g., by forming a cross-plot or ratio thereof, to provide an indication of the lithology and salinity of the earth formation.
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Schweitzer Jeffrey S.
Tapphorn Ralph M.
Fields Carolyn E.
Schlumberger Technology Corporation
Smith Alfred E.
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