Changes

* 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.

* Salt volumes tend to be underestimated in interpretations of seismic data. In contrast, shale mass volumes are commonly overestimated by geophysical interpreters (Van Rensbergen and Morley<ref name=Vanrensbergenandmorley_2003>Van Rensbergen, P., and C. K. Morley, 2000, [http://www.sciencedirect.com/science/article/pii/S026481720000026X 3D seismic study of a shale expulsion syncline at the base of the Champion Delta, offshore Brunei and its implications for the early structural evolution of large delta systems]: Marine and Petroleum Geology, v. 17, p. 861–872.</ref>) because of the manner in which geophysical data are processed. The apparent pull-up of beds around shale diapirs is caused by overmigration of the shale mass and treating its velocity as one would a salt.

* Salt volumes tend to be underestimated in interpretations of seismic data. In contrast, shale mass volumes are commonly overestimated by geophysical interpreters (Van Rensbergen and Morley<ref name=Vanrensbergenandmorley_2003>Van Rensbergen, P., and C. K. Morley, 2000, [http://www.sciencedirect.com/science/article/pii/S026481720000026X 3D seismic study of a shale expulsion syncline at the base of the Champion Delta, offshore Brunei and its implications for the early structural evolution of large delta systems]: Marine and Petroleum Geology, v. 17, p. 861–872.</ref>) because of the manner in which geophysical data are processed. The apparent pull-up of beds around shale diapirs is caused by overmigration of the shale mass and treating its velocity as one would a salt.