Method for depth referencing hydrocarbon gas shows on mud logs
A method is described for identifying hydrocarbon formations surrounding a borehole, comprising the steps of: a. measuring hydrocarbon gas in the entrained formation cuttings obtained during drilling operations in which a drilling mud is continually circulated past a drill bit to carry the cuttings to the earth's surface, b. simultaneously measuring natural gamma radiation in the cuttings, c. identifying the depths at which the cuttings were obtained within the borehole, d. measuring natural gamma radiation within the borehole following completion of the drilling operations, e. correlating the natural gamma radiation measurements in steps (b) and (d), and f. identifying the depths within the borehole from which the entrained cuttings containing hydrocarbon gas were obtained during drilling operations when there is correlation between the natural gamma radiation measurements in steps (b) and (d).
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4578579
- OSTI ID:
- 5867801
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
CAVITIES
CUTTINGS REMOVAL
DEPTH
DIMENSIONS
DRILL BITS
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUIDS
GAMMA LOGGING
GEOLOGIC DEPOSITS
MINERAL RESOURCES
MWD SYSTEMS
NATURAL GAS DEPOSITS
NATURAL GAS WELLS
NATURAL RADIOACTIVITY
OIL WELLS
PETROLEUM DEPOSITS
RADIOACTIVITY
RADIOACTIVITY LOGGING
REMOVAL
RESOURCES
WELL LOGGING
WELLS