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Applications of the Compensated Spectral Natural Gamma tool

Conference ·
OSTI ID:6893171
; ;
The Compensated Spectral Natural Gamma tool is a new generation natural gamma ray spectroscopy logging system which utilizes the complete energy spectrum to give information on the borehole environment as well as the concentrations of potassium (K), uranium (U) and thorium (Th) in the formation. The novel hardware and software features of the CSNG tool are demonstrated using log examples. The elemental concentrations are estimated from the window count rates using the method of weighted least squares which incorporates real-time compensation for borehole effects. This is accomplished by using an attenuation model which accounts for count rate reduction and spectrum shape changes due to borehole absorption and scattering. The value of this compensation technique is shown by logs which were made in wells both before and after casing was set. These examples show that the computed K, U and Th concentrations agree within the measurement uncertainties.
Research Organization:
Welex, a Halliburton Co.
OSTI ID:
6893171
Report Number(s):
CONF-8406110-
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
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALKALI METALS
ALPHA DECAY RADIOISOTOPES
AMERICIUM 241
AMERICIUM ISOTOPES
CHEMISTRY
COMPUTER CODES
COMPUTERIZED SIMULATION
COMPUTERS
ELEMENTS
EQUIPMENT
FUNCTIONS
GAMMA LOGGING
GAMMA SPECTRA
GAMMA SPECTROSCOPY
GEOCHEMISTRY
GEOLOGIC DEPOSITS
HEAVY NUCLEI
ISOTOPES
LEAST SQUARE FIT
LITHOLOGY
MAXIMUM-LIKELIHOOD FIT
METALS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NUCLEI
NUMERICAL SOLUTION
ODD-EVEN NUCLEI
P CODES
PETROLEUM DEPOSITS
POTASSIUM
Q CODES
RADIOACTIVITY LOGGING
RADIOISOTOPES
REAL TIME SYSTEMS
RESERVOIR ROCK
RESOURCES
SIMULATION
SPECTRA
SPECTROSCOPY
THORIUM
URANIUM
WEIGHTING FUNCTIONS
WELL LOGGING
WELL LOGGING EQUIPMENT
YEARS LIVING RADIOISOTOPES