Shale Index

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GR-tool readings  $//<![CDATA[ \begin{array}{l}GR_{log}\end{array} //]]>$ 

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the reference values in clean rocks   $//<![CDATA[ \begin{array}{l}GR_m\end{array} //]]>$

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the reference values in pure shales  $//<![CDATA[ \begin{array}{l}GR_{sh}\end{array} //]]>$