Continuous carbon/oxygen log-basic concepts and recent field experiences
The continuous carbon/oxygen (C/theta) log, recorded by a 20-kHz pulsed neutron logging tool, locates and quantitatively evaluates hydrocarbon reserves in cased wellbores independent of the salinity of formation waters. Gamma rays emitted during neutron inelastic scattering and neutron capture provide information on relative amounts of several elements in potential reservoirs, such as C, theta, silicon (Si), calcium (Ca), etc. These data can be related to oil saturation of reservoir rocks of fresh, mixed, or unknown formation water salinities and to formation lithology. Measurement principles, tool response, test pit data, and interpretive concepts are summarized. Field case examples include hydrocarbon exploration behind pipe, monitoring of production wells, secondary and tertiary recovery schemes, evaluation of heavy oil reservoirs, tar sands, and steamfloods, and other case studies in clastic carbonate reservoirs.
- Research Organization:
- SPE, Dresser Industries Inc.
- OSTI ID:
- 6276077
- Journal Information:
- J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 34:10; ISSN JPTJA
- Country of Publication:
- United States
- Language:
- English
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020300* -- Petroleum-- Drilling & Production
04 OIL SHALES AND TAR SANDS
040400 -- Oil Shales & Tar Sands-- Oil Production
Recovery
& Refining
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BITUMINOUS MATERIALS
CARBON
CARBONACEOUS MATERIALS
ELEMENTS
ENERGY SOURCES
ENHANCED RECOVERY
FOSSIL FUELS
FUELS
HYDROCARBONS
LITHOLOGY
MATERIALS
MEASURING METHODS
NEUTRON LOGGING
NEUTRON-GAMMA LOGGING
NONMETALS
OIL SANDS
OIL SATURATION
OIL WELLS
ORGANIC COMPOUNDS
OXYGEN
RADIOACTIVITY LOGGING
RECOVERY
RESERVOIR ROCK
SATURATION
WELL LOGGING
WELLS