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Neutron borehole logging correction technique

Patent ·
OSTI ID:6785612
In accordance with an illustrative embodiment of the present invention, a method and apparatus is disclosed for logging earth formations traversed by a borehole in which an earth formation is irradiated with neutrons and gamma radiation produced thereby in the formation and in the borehole is detected. A sleeve or shield for capturing neutrons from the borehole and producing gamma radiation characteristic of that capture is provided to give an indication of the contribution of borehole capture events to the total detected gamma radiation. It is then possible to correct from those borehole effects the total detected gamma radiation and any earth formation parameters determined therefrom.
Assignee:
Schlumberger Technology Corp.
Patent Number(s):
US 4078174
OSTI ID:
6785612
Country of Publication:
United States
Language:
English

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Related Subjects

440105 -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
440400* -- Well Logging Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
47 OTHER INSTRUMENTATION
CORRECTIONS
DATA ACQUISITION SYSTEMS
DATA PROCESSING
DESIGN
EQUIPMENT
GAMMA SPECTRA
NEUTRON LOGGING
NEUTRON-GAMMA LOGGING
POROSITY
PROCESSING
RADIOACTIVITY LOGGING
SPECTRA
WELL LOGGING