Changes

* Shale welds are less prevalent in shale systems than salt welds are in salt systems.

* Shale welds are less prevalent in shale systems than salt welds are in salt systems.

* Shales have a much slower velocity than salt. Salt will be underlain by seismic pull-up versus no pull-up beneath shale features.

* Shales have a much slower velocity than salt. Salt will be underlain by seismic pull-up versus no pull-up beneath shale features.

* Salt requires a pipe several kilometers wide to facilitate vertical migration. In contrast, fluids migrating through shales will crack and hydraulically fracture a zone through which they will migrate upward.

* Salt requires a pipe several kilometers wide to facilitate vertical migration. In contrast, fluids migrating through shales will crack and hydraulically [[fracture]] a zone through which they will migrate upward.

* Shale may flow laterally but will develop overhangs of less than 6 km (3.7 mi). In contrast, salt overhangs may be on the order of tens of kilometers.

* Shale may flow laterally but will develop overhangs of less than 6 km (3.7 mi). In contrast, salt overhangs may be on the order of tens of kilometers.

* Ductile behavior of shales is unlikely above 80°C (176°F), and brittle behavior is more likely. Therefore, this temperature will provide a plasticity [[basement]] within a basin to constrain interpretation of tectonically active shales.

* Ductile behavior of shales is unlikely above 80°C (176°F), and brittle behavior is more likely. Therefore, this temperature will provide a plasticity [[basement]] within a basin to constrain interpretation of tectonically active shales.