Neutron-inelastic gamma radiation well logging method and apparatus with background radiation accounted for Patent #: 4381449
ApplicationNo. 06/386315 filed on 06/08/1982
US Classes:250/269.8With detection in plural consecutive time intervals
ExaminersPrimary: Howell, Daniel W.
Attorney, Agent or Firm
International ClassesG01V 5/00 (20060101)
G01V 5/10 (20060101)
AbstractMethods and apparatus are provided for making improved pulsed neutron derived measurements of the carbon: oxygen ratio in subsurface earth formations. Plural radiation measurements are made as a function of time from the initiation of the neutron pulse to distinguish inelastic and thermal neutron interactions. These measurements are then combined in several different manners to provide an improved carbon:oxygen ratio measurement and multiple porosity and formation lithology indication measurements.