SOLVED: Principle of operation of the Gamma Ray log a) What formation property does the gamma ray log reflect? b) Which different radioactive elements are recorded? c) What is the standard unit of the GR log? How is it defined? d) Why do the SP and the GR log correlate in shale and sand sequences of sediments? e) Does a high GR reading always indicate the presence of shale? f) In the case of (e) which tool helps to identify the cause of the high GR count? g) What are the different applications o

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