− | Physical conditions constraining migration through stratigraphic sections are pressure, temperature, [[permeability]], capillarity, surface tension, molecular size, and density. The main chemical constraint is solubility of migrating hydrocarbons. | + | Physical conditions constraining migration through stratigraphic sections are [[Wikipedia:Pressure|pressure]], [[Wikipedia:Temperature|temperature]], [[permeability]], [[Capillary pressure|capillarity]], [http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html surface tension], molecular size, and [http://physics.about.com/od/fluidmechanics/f/density.htm density]. The main chemical constraint is [[Wikipedia:Solubility|solubility]] of migrating hydrocarbons. |