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Geology/Gamma response in Marl vs Shale


Asalaam o Aalikum,
Dear Sir,
Kindly tell me about the response of Gamma Ray in Marl and Shale.
Which lithology has generally high Gamma ray values?
Thanks a lot for your time.

Dear Atif Ismail,

Gamma Ray (GR) log reads total radioactivity of the formation due to the presence of Uranium, Thorium and Potassium. Marl is the calcareous claystone which means that mainly made up of the detritus of limestone therefore it should read low GR whereas shale should read high GR.

Shales and claystone contain naturally occurring radioactive minerals therefore GR is high i these lithologies whereas sandstones, dolomites and limestones should read low GR.



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Syed Tariq Hasany


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