Method and apparatus for well logging

Details Method and apparatus for well logging Method and apparatus for well logging

G - Physics

01

V

358/4

G01V 5/00 (2006.01)

Patent

CA 1065501

METHOD AND APPARATUS FOR WELL LOGGING SPECIFICATION ABSTRACT OF THE DISCLOSURE In accordance with an illustrative embodiment of the present invention, a technique is disclosed for deter- mining a characteristic of an earth formation by irradiating the formation with a source of neutrons and measuring the resulting neutron population at two different spacings from the source. Each neutron population measurement is converted into a signal which is related to the formation porosity corrected for environmental effects. The two converted sig- nals are then compared with the porosity derived from the ratio of the two neutron population measurements in order to obtain an indication of the presence of gas in the formation.

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