Broad energy spectra neutron source for logging and method

Patent · Tue Mar 17 04:00:00 EST 1992

OSTI ID:5357364

Grau, J A; Roscoe, B A

This patent describes a method for identifying and determining the concentrations of subsurface formation elements next to a borehole. It comprises irradiating the formations with neutrons from a broad energy spectra neutron source disposed in a logging tool lowered in the borehole wherein the neutron source is the only source in the logging tool; detecting and counting the delayed gamma rays resulting from the activation of atoms of at least a first element by the neutrons emitted by the source; deducing from the counts of activation gamma rays the concentration of the first element; detecting and counting the prompt gamma rays resulting from the capture of the neutrons emitted by the source by atoms of at least a second element; and deducing from the count rates of capture gamma rays the concentration of the second element.

• Assignee: Schlumberger Technology Corp., New York, NY (United States)
• Patent Number(s): US 5097123; A
• Application Number: PPN: US 7-683402
• OSTI ID: 5357364
• Country of Publication: United States
• Language: English

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