Abstract
Abstract Gamma ray spectral logging can be used for qualitative and quantitative evaluations of argillaceous sediments, in both cased and open boreholes. Well-logging devices record the gamma rays emitted by potassium (K40) at 1.46 MeV, the uranium series nuclide bismuth (Bi214) emanating gamma rays at 1.76 MeV, and the thorium series nuclide thallium (Tl208) emanating gamma rays at 2.61 MeV. The information obtained can be used in strati-graphic correlations, recognition of rock types, determining the amount and type of clay minerals present in clastic formations, establishing rock potential of shales, evaluating diagenetic and catagenetic changes in clay minerals, CEC estimates, and so on.
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