Well logging method and apparatus using a continuous energy spectrum photon source

Patent · Tue Aug 24 04:00:00 EDT 1976

OSTI ID:7145184

Turcotte, R E

In accordance with an illustrative embodiment of the present invention, a method and apparatus for logging an earth formation of interest is disclosed in which repetitive bursts of a continuous energy spectrum of photons are emitted that penetrate the media surrounding a borehole traversing the earth formation. Thereafter, indications of photons resulting from the interaction of the emitted photons and the surrounding media are obtained, each indication being obtained at a different separation from the source along the axis of the borehole. Finally, the indications are compared to determine representations of a characteristic of the media surrounding the borehole. According to one aspect of the present invention, at least one of the indications is the result of annihilation photons produced by the interaction of the emitted photons and the surrounding media.

• Assignee: Schlumberger Technology Corp.
• Patent Number(s): US 3976879
• OSTI ID: 7145184
• Country of Publication: United States
• Language: English

Related Subjects

440105 -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
440400* -- Well Logging Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
ACCELERATORS
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
EQUIPMENT
GAMMA SPECTROMETERS
GAMMA-GAMMA LOGGING
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
RADIATION SOURCES
RADIATIONS
RADIOACTIVITY LOGGING
SPECTROMETERS
TARGETS
WELL LOGGING