The Potassium-calcium Method on Basis of Gammaspectrometry Well-logging Data Like the Method of Determination of the Rock Age
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Frantisek Rysavy
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| Transactions of the VSB - Technical University of Ostrava, Civil Engineering Series |
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2009, Volume 9, Issue 2, Pages 225-240
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Doi: Not indexed
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This paper presents way how to determine the rock age from the continuous curve of the real bygone time expressed like function of depth. Inputs of well-logging data are two continuous curves registered for two elements: K40,19 and Ca40,20. Both you get with the help of gamma-spectrometry for the natural gamma-ray and for the spectrometric neutron-gamma method. Both curves are computed to create the only curve of ratio reporting about quantities of the mentioned elements. The ratio curve is transformed into time domain to be formed the only curve remarked as the curve of the apparent time. Relations for transformation can be various; here are two, after author and after Hamilton. This curve of the apparent time has two components; global and local ones. The global is presented with the curve of trend for rocks being not carbonates. The above trend has various shapes: exponential, linear, polynomial up to sixth degree or all other. We expect that this curve presents the one of the real bygone time which is used for determination of the rock age.
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