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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 63 (1979)

Issue: 3. (March)

First Page: 449

Last Page: 449

Title: Gamma-Ray Spectral Logging Data Assist in Geologic Studies: ABSTRACT

Author(s): Walter H. Fertl

Article Type: Meeting abstract

Abstract:

Natural gamma-ray spectral logging in open and in older, already cased wellbores has a broad problem-solving capability in evaluation of clastics, carbonate rocks, evaporites, and igneous formations.

Geologic application of such gamma-ray spectral data on a qualitative basis includes detailed stratigraphic correlation, identification of rock types, presence of secondary porosity and natural fracture systems, recognition of the depositional environment and source-rock potential of shales, location of watered-out intervals in reservoirs under enhanced recovery, etc; and on a qualitative basis, the determination of reservoir shaliness, in-situ potash concentration, etc.

Basically, natural gamma-ray spectral logging techniques yield a calibrated, continuous record of the total natural gamma-ray radioactivity and the individual potassium, uranium, and thorium content of subsurface formation as illustrated by field studies from the United States, the North Sea area, South America, and the Middle East.

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Copyright 1997 American Association of Petroleum Geologists