Optimized determination thermal decay time

Details Optimized determination thermal decay time Optimized determination thermal decay time

G - Physics

01

V

358/4

G01V 5/10 (2006.01)

Patent

CA 1255397

ABSTRACT A novel neutron burst timing, detection, and calculation method and apparatus are disclosed for a Thermal Decay Time Logging System. A neutron bursting regime is provided which includes a short burst, long burst repetitive sequence. After a short delay from the short burst, a first series of time gates is provided for accumulating gamma ray counts. After a relatively longer delay from the long burst, a second series of time gates is provided for accumulating gamma ray counts. The thermal neutron decay time constant ? and the macroscopic capture cross-section .SIGMA. of the formation are determined through an iterative procedure by which the formation ? is estimated from the second series of time gates which have been stripped of borehole decay counts determined from the first series of time gates. Similarly, the borehole T is estimated from the first series of time gates which have been stripped of formation decay counts determined from the second series of time gates.

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