Pulsed neutron porosity logging system

Patent · Tue Oct 24 04:00:00 EDT 1978

OSTI ID:6423934

Smith, Jr, H D; Smith, M P; Schultz, W E

An improved pulsed neutron porosity logging system is provided in the present invention. A logging tool provided with a 14 MeV pulsed neutron source, an epithermal neutron detector, and a fast neutron detector is moved through a borehole. Repetitive bursts of neutrons irradiate the earth formations and, during the bursts, the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation due to lingering thermal neutrons. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.

• Assignee: Texaco Inc.
• Patent Number(s): US 4122340
• OSTI ID: 6423934
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BACKGROUND RADIATION
BARYONS
BOREHOLES
CAVITIES
DESIGN
ELEMENTARY PARTICLES
ENERGY RANGE
EPITHERMAL NEUTRONS
FAST NEUTRONS
FERMIONS
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
HADRONS
MEASURING INSTRUMENTS
MEASURING METHODS
MEV RANGE
MEV RANGE 10-100
NATURAL GAS DEPOSITS
NEUTRON DETECTORS
NEUTRON LOGGING
NEUTRON SOURCES
NEUTRON-NEUTRON LOGGING
NEUTRONS
NUCLEONS
OPERATION
PARTICLE SOURCES
PETROLEUM DEPOSITS
POROSITY
PULSED NEUTRON TECHNIQUES
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
RADIOACTIVITY LOGGING
RESOURCES
ROCKS
THERMAL NEUTRONS
WELL LOGGING