SILICA-ALUMINA RADIOACTIVE LOGGING

Patent · Tue May 15 04:00:00 EDT 1962

OSTI ID:4832914

Turner, S E; Caldwell, R L

A neutron-gamma ray logging system is designed for determining the structural character of earth formations by means of measurements of delayed gamma radiation from Al/sup 28/ and Na/sup 24/ produced by fast neutron bombardment of Si and Al, respectively. The system comprises a source of neutrons of energy >2.7 Mev, a gamma-ray detector shielded from the source, means for moving the system in a well bore at such a speed that the delayed gamma rays are detected at any one point approximates 1 min after cessation of neutron bombardment, energy discriminating means for producing signals proportional to radiation from Al/sup 28/ and Na/sup 24/, and means for recording the ratio of the signals as a function of depth within the well bore. The system will provide indication of the SiO/sub 2/ (e.g., sand) and Al/sub 2/O/sub 3/ (e.g., clay) content of the stratum and thus give a measure of the permeability of the stratum and its tenacity for petroleum fluids. (D.L.C.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-017906
• Assignee: Socony Mobil Oil Co., Inc.
• Patent Number(s): US 3035174
• OSTI ID: 4832914
• Country of Publication: United States
• Language: English

Related Subjects

ACTIVATION ANALYSIS
ALUMINUM 28
ALUMINUM OXIDES
CONFIGURATION
DEPOSITS
FAST NEUTRONS
GAMMA DETECTION
GAMMA RADIATION
GEOLOGY, MINERALOGY, AND METEOROLOGY
NEUTRON BEAMS
NEUTRONS
PETROLEUM
POROSITY
PROSPECTING
QUANTITATIVE ANALYSIS
QUANTITY RATIO
RECORDING SYSTEMS
ROCKS
SERVOMECHANISMS
SIGNALS
SILICON OXIDES
SODIUM 24
WELL LOGGING