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<p>In nonpermeable sections both tools read alike and the traces fall on top of each other on the stripchart log. In permeable sections, they separate.</p>

<p><big>Formation evaluation tools</big></p>
<p>Formation evaluation tools are specialized instruments used during <a href="page.php?w=Well_drilling">drilling</a> or after drilling to measure physical properties of <a href="page.php?w=subsurface">subsurface</a> formations. These tools help identify <a href="page.php?w=hydrocarbon">hydrocarbon</a>-bearing zones, estimate <a href="page.php?w=Petroleum_reservoir">reservoir</a></p><p>
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