Method for induced gamma ray logging
In a nuclear well logging operation, a method is described for indicating the presence of gas in a fluid filled zone of a subsurface earth formation, comprising the steps of: cyclically irradiating the subsurface earth formation with bursts of high energy neutrons; detecting for one or more burst cycles the impingement of gamma radiation upon a first gamma radiation detector means during and between each of the burst; determining a first parameter indicative of the count of detected impingements of primarily inelastic gamma radiation upon the first detector means; determining a second parameter indicative of the count of detected impingements of primarily capture gamma radiation upon the first detector means; and comparing the first and second parameters to determine the presence of gas.
- Assignee:
- Dresser Industries, Inc., Dallas, TX
- Patent Number(s):
- US 4656354
- OSTI ID:
- 6823229
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030200* -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BEAMS
COMPUTER CALCULATIONS
DETECTION
ELECTROMAGNETIC RADIATION
EQUIPMENT
GAMMA DETECTION
GAMMA LOGGING
GAMMA RADIATION
IONIZING RADIATIONS
IRRADIATION
MEASURING INSTRUMENTS
NATURAL GAS WELLS
NEUTRON BEAMS
NUCLEON BEAMS
PARTICLE BEAMS
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
RADIOACTIVITY LOGGING
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS