Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1979-05-18
1982-03-02
Willis, Davis L.
Radiant energy
Coded record and readers; invisible radiant energy type
G01V 500
Patent
active
043179932
ABSTRACT:
In the illustrative embodiments of the invention disclosed, the composition of an earth formation is investigated by repetitively irradiating the formation with bursts of fast neutrons and generating an energy spectrum of the gamma rays resulting from the inelastic scattering of such neutrons by nuclei of the formation. The inelastic scattering gamma ray spectrum is analyzed by comparing it with a composite spectrum, made up of standard spectra of constituents postulated to comprise the formation, to determine the proportions in the formation of the postulated constituents. A background energy spectrum is generated from gamma rays detected during periods between neutron bursts and is utilized to provide one or more standard background spectra for use in the analysis of the inelastic scattering gamma ray spectra. The standard background spectrum or spectra are preferably updated on a repetitive basis to reflect the current background component in the detected inelastic scattering gamma ray spectrum. More reliable information is thereby obtained of the presence of oil in the formation through the derivation of such indicators as the carbon/oxygen ratio, calcium/silicon ratio and the like. Constituent analysis may also be made of the detected background gamma ray spectrum to determine the proportions of the formation constituents contributing to such spectrum, and the standards for the most significant background contributors or the composite spectrum produced by such standard spectra may be used among the standard spectra for the inelastic scattering spectrum analysis in lieu of the detected background spectrum itself.
REFERENCES:
patent: 3521064 (1970-07-01), Moran et al.
patent: 3739171 (1973-06-01), Scott
patent: 3780303 (1973-12-01), Smith, Jr. et al.
patent: 3842265 (1974-10-01), Pitts, Jr.
patent: 3886355 (1975-05-01), Culver
patent: 3930153 (1975-12-01), Scott
patent: 3943362 (1976-03-01), Peelman
patent: 4055763 (1977-10-01), Antkiw
Hertzog, Jr. Russel C.
Nelligan William B.
Schlumberger Technology Corporation
Willis Davis L.
LandOfFree
Methods and apparatus for constituent analysis of earth formatio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and apparatus for constituent analysis of earth formatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for constituent analysis of earth formatio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-60970