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1989•SPE Formation EvaluationRequires access

Geochemical Logging With Spectrometry Tools

Russel C. Hertzog, L. Colson, B. Seeman, Monica O'Brien, Hugh D. Scott, Donald C. McKeon, P.D. Wraight, James A. Grau, D. V. Ellis, J.S. Schweitzer, Michael M. Herron

Open publisher page 175 citations

Abstract

Summary A geochemical logging tool (GLTSM) string, measuring natural, activation, and prompt neutron-capture gamma rays, produces logs of the most abundant and a few trace inorganic element concentrations. Direct measurements of Al concentrations are provided. A geochemically based closure model is used to derive Si, Ca, Fe, S, Gd, and Ti concentrations. The only significant spectroscopically undetermined element, Mg, is inferred by comparing measured with derived photoelectric factor. Analysis algorithms, demonstrations of accuracy and precision, and applications of geochemically derived formation properties are discussed.

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What this paper is about

Summary A geochemical logging tool (GLTSM) string, measuring natural, activation, and prompt neutron-capture gamma rays, produces logs of the most abundant and a few trace inorganic element concentrations. Direct measurements of Al concentrations are provided. A geochemically based closure model is used to derive Si, Ca, Fe, S, Gd, and Ti concentrations. The only significant spectroscopically undetermined element, Mg, is inferred by comparing measured with derived photoelectric factor. Analysis algorithms, demonstrations of accuracy and precision, and applications of geochemically derived formation properties are discussed.

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Available abstract

Summary A geochemical logging tool (GLTSM) string, measuring natural, activation, and prompt neutron-capture gamma rays, produces logs of the most abundant and a few trace inorganic element concentrations. Direct measurements of Al concentrations are provided. A geochemically based closure model is used to derive Si, Ca, Fe, S, Gd, and Ti concentrations. The only significant spectroscopically undetermined element, Mg, is inferred by comparing measured with derived photoelectric factor. Analysis algorithms, demonstrations of accuracy and precision, and applications of geochemically derived formation properties are discussed.

Key concepts: Well logging, Logging, Neutron activation analysis, Trace element, Geology, Photoelectric effect, Mass spectrometry, Neutron activation

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