G - Physics – 01 – V
Patent
G - Physics
01
V
358/4
G01V 5/00 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1042117
ABSTRACT The present invention relates to a method of investigating subsurface earth formations traversed by a borehole. The method comprises the steps of repetitively irradiating earth formations in the vicinity of a borehole with pulses of fast neutrons which engage in inelastic scattering interactions with formation nuclei and which are thereafter slowed to thermal energy and engage in further neutron capture interactions with formation nuclei. The method further includes the step of detecting, during a first discrete time interval associated with the fast neutron pulses energy dependent distributions of gamma radiations attributable to the inelastic scattering of fast neutrons by the elements carbon and oxygen in the formations and generating signals representative of carbon inelastic gamma rays and oxygen inelastic gamma rays. The method also includes the step of detecting, during a second, later discrete time interval, energy dependent distribution of gamma radiations attributable to the capture of thermal neutrons by the elements calcium and silicon in the formations and generating signals representative of calcium capture gamma rays and silicon capture gamma rays. The method further comprises the step of generating a first ratio signal comprising a ratio of the carbon and the oxygen inelastic gamma ray representative signals and generating a second ratio signal comprising a ratio of the calcium and silicon capture gamma ray representative signals and recording the first and second ratio signals as a function of the borehole depth.
142166
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