Apparatus for measuring borehole-compensated densities and lithology-dependent factors using one or more detectors
Patent
·
OSTI ID:5955521
A method is described for determining a quality indicator for lithology-dependent factor of a geological formation surrounding a borehole, irradiated by gamma rays, comprising: producing at least two first measurement signals of scattered gamma rays from energy windows which are significantly affected by photoelectric absorption; producing at least one additional measurement signal of scattered gamma rays from energy windows which are less sensitive to photoelectric absorption than the first measurement signals; and combining the measurement signals according to a predetermined relation to obtain a compensated lithology-dependent factor for each of at least two energy windows which are significantly affected by photoelectric absorption, and using differences of the at least two lithology-dependent factors to judge the quality of the lithology-dependent factors.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4814611
- OSTI ID:
- 5955521
- Country of Publication:
- United States
- Language:
- English
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02 PETROLEUM
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03 NATURAL GAS
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Geology
& Exploration
EQUIPMENT
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GAMMA LOGGING
GEOLOGIC DEPOSITS
GEOPHYSICS
LITHOLOGY
MINERAL RESOURCES
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RADIOACTIVITY LOGGING
RESERVOIR ROCK
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WELL LOGGING EQUIPMENT
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
EQUIPMENT
EXPLORATION
GAMMA LOGGING
GEOLOGIC DEPOSITS
GEOPHYSICS
LITHOLOGY
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RADIOACTIVITY LOGGING
RESERVOIR ROCK
RESOURCES
WELL LOGGING
WELL LOGGING EQUIPMENT