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Quick-look lithology from logs (view source)
Revision as of 20:20, 28 July 2014
, 20:20, 28 July 2014→Coal
====Coal====
====Coal====
Medium to high rank coals are often brittle and well-jointed. Such joint blocks cave into the borehole ([[:file:quick-look-lithology-from-logs_fig1.png|Figure 1c]]) leaving deep washouts as thick as the coal seam (frequently only [[length::1 ft]] or so). Not all coals behave this way.
Medium to high rank coals are often [[Brittleness|brittle]] and well-jointed. Such joint blocks cave into the borehole ([[:file:quick-look-lithology-from-logs_fig1.png|Figure 1c]]) leaving deep washouts as thick as the coal seam (frequently only [[length::1 ft]] or so). Not all coals behave this way.
====Carbonates====
====Carbonates====