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A borehole correction model for capture gamma ray spectroscopy logging tools

Journal Article · · SPE (Society of Petroleum Engineers) Format. Eval.; (United States)
DOI:https://doi.org/10.2118/14462-PA· OSTI ID:6983431
; ;
A borehole correction model, based on more than 1,000 laboratory measurements, has been developed for logging tools that measure gamma ray energy spectra induced by the capture of thermal-energy neutrons. The measurements were made with a field-worthy tool incorporating a pulsed source of 14-MeV neutrons and a NaI(T1) gamma ray detector. In addition to the obvious geometric dependencies on borehole and casing sizes, the sensitivity of the measurement to elements within the borehole was found to depend just as strongly on the porosity and salinity of the borehole and formation fluids. The model decouples the geometric effects from most of the nuclear physics effects by explicitly including the time decay of the neutron flux in each homogeneous region.
Research Organization:
Schlumberger-Doll Research (US)
OSTI ID:
6983431
Journal Information:
SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Format. Eval.; (United States) Vol. 3:1; ISSN SFEVE
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
ACTIVATION ANALYSIS
BARYON REACTIONS
BOREHOLES
CAVITIES
CHEMICAL ANALYSIS
EQUIPMENT
EXPLORATION
FLUIDS
GAMMA LOGGING
GAMMA SPECTROMETERS
GAMMA SPECTROSCOPY
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOPHYSICS
HADRON REACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PETROLEUM DEPOSITS
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
RESERVOIR ROCK
RESOURCES
SPECTROMETERS
SPECTROSCOPY
WELL LOGGING
WELL LOGGING EQUIPMENT