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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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The most important mechanical property for evaluating seal integrity is ductility. Ductile rocks make good top seals; [[Brittleness|brittle]] rocks make poor top seals. Shales and salt are two of the most ductile rock types and, not surprisingly, two of the most common top seals.<ref name=ch10r33>Grunau, H., R., 1987, A world-wide look at the cap-rock problem: Journal of Petroleum Geology, vol. 10, no. 3, p. 245–266., 10., 1111/jpg., 1987., 10., issue-3</ref>

The most important mechanical property for evaluating seal integrity is [[ductility]]. Ductile rocks make good top seals; [[Brittleness|brittle]] rocks make poor top seals. Shales and salt are two of the most ductile rock types and, not surprisingly, two of the most common top seals.<ref name=ch10r33>Grunau, H., R., 1987, A world-wide look at the cap-rock problem: Journal of Petroleum Geology, vol. 10, no. 3, p. 245–266., 10., 1111/jpg., 1987., 10., issue-3</ref>

==What is ductility?==

==What is ductility?==