Title: Neutron well logging technique for gas detection

Abstract: In accordance with an illustrative embodiment of the present invention, a technique is disclosed for determining 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 signals 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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Inventors: Bateman, Richard M. (Chicago, IL, US)
Clavier, Christian M. (Ridgefield, CT, US)

Application Number: 671905
Filing Date: 1976-03-29
Publication_date: 1977-09-06
Assignee: Schlumberger Technology Corporation (New York, NY)
Primary Class(es): 250/264 250/266, 250/269.4
Other Classes:
US Patent Ref:

3701902	Oct, 1972	Janssen et al.	250/265.
3789219	Jan, 1974	Wilson	250/270.
3833809	Sep, 1974	Beil	250/270.
3842265	Oct, 1974	Pitt, Jr.	250/270.

Other Refs:
Primary Examiner: Willis, Davis L.
Assistant Examiner:
Attorney: