Neutron-neutron logging

Patent · Tue Aug 25 04:00:00 EDT 1981

OSTI ID:5996947

Allen, L S

A borehole logging tool includes a steady-state source of fast neutrons, two thermal neutron detectors, and two gamma ray detectors. A count rate meter is connected to each neutron detector. A first ratio detector provides the ratio of the outputs of the two count rate meters connected to the two thermal neutron detectors. A second ratio detector provides the ratio of the outputs of the two count rate meters connected to the two gamma ray detectors. By comparing the signals of the two ratio detectors, oil bearing zones and salt water bearing zones within the formation being logged can be distinguished and porosity can be determined.

• Assignee: Mobil Corp
• Patent Number(s): US 4286150
• OSTI ID: 5996947
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BARYONS
BOREHOLES
CAVITIES
COUNTING RATEMETERS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
EQUIPMENT
FERMIONS
GAMMA RADIATION
GEOLOGIC DEPOSITS
HADRONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MINERAL RESOURCES
NEUTRON DETECTORS
NEUTRON LOGGING
NEUTRON-NEUTRON LOGGING
NEUTRONS
NUCLEONS
OIL WELLS
PETROLEUM DEPOSITS
RADIATION DETECTORS
RADIATIONS
RADIOACTIVITY LOGGING
RESOURCES
SIGNALS
THERMAL NEUTRONS
WELL LOGGING
WELLS