Elemental gamma ray signature instrument

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods

Reexamination Certificate

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Reexamination Certificate

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10916921

ABSTRACT:
Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective function subject to equality and/or inequality constraints).

REFERENCES:
patent: 4390783 (1983-06-01), Grau
patent: 4394574 (1983-07-01), Grau et al.
patent: 4712424 (1987-12-01), Herron
patent: 4773264 (1988-09-01), Herron
patent: 4916616 (1990-04-01), Freedman et al.
patent: 5440118 (1995-08-01), Roscoe
patent: 5471057 (1995-11-01), Herron
patent: 5675147 (1997-10-01), Ekstrom et al.
Peter Westaway et al.;Neutron-Induced Gamma Ray Spectroscopy for Reservoir Analysis, SPE-9461, Jun. 1983, pp. 553-564, 12 Figs., 3 Tables.
R.C.Hertzog;Laboratory and Field Evaluation of an Inelastic-Neutron-Scattering and Capture Gamma Ray Spectroscopy Tool,SPE 7430, 53rd Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME, Oct. 1-3, 1978; pp. 1-14, 18 Figs.
J. A. Grau et al.;Prompt γ-Ray Spectral Analysis of Well Data Obtained with Nal(T1)and 14 MeV Neutrons, Nucl. Geophys. vol. 1, No. 2, pp. 157-165, 19879 Figs., 3 Tables.
B. A. Roscoe et al.;Statistical Precision of Neutron-Induced Gamma Ray Spectroscopy Measurements, The Log Analyst, Nov.-Dec., 1987, pp. 538-545, 10 Figs.

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