Pulsed neutron porosity logging

Patent · Tue Mar 20 04:00:00 EST 1990

OSTI ID:6755532

Mills, Jr, W R; Stromswold, D C

This patent describes a pulsed neutron porosity logging method. It comprises: repetitively irradiating a subsurface formation with bursts of fast neutrons, measuring the die-away rate of epithermal neutrons during a die-away spectrum for the epithermal neutrons within the irradiated subsurface formation substantially between each of the bursts of fast neutrons as a first measure of lithology independent porosity of the subsurface formation, measuring a count of epithermal neutrons during a die-away spectrum for the epithermal neutrons within the irradiated subsurface formation between each of the bursts of fast neutrons as a second measure of lithology dependent porosity of subsurface formation, and combining the measurements of epithermal neutron die-away rate and epithermal neutron count to provide an indication of subsurface formation lithology.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): A; US 4910397
• Application Number: PPN: US 7-295619A
• OSTI ID: 6755532
• 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
EXPLORATION
GEOLOGIC DEPOSITS
LITHOLOGY
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NEUTRON LOGGING
PETROLEUM DEPOSITS
POROSITY
PULSE TECHNIQUES
RADIOACTIVITY LOGGING
RESOURCES
SOURCE ROCKS
WELL LOGGING