Traps with leaky seals or reduced seal capacity may still maintain an economic column of petroleum. Partially leaked traps are characterized by a zone of residual petroleum saturation thicker than the transition zone predicted by capillary pressure tests. Shows in traps that have leaked are similar to those in spilled traps. Paleofluid contacts are usually flat, not tilted like spilled traps.
+
Traps with leaky seals or reduced seal capacity may still maintain an economic column of petroleum. Partially leaked traps are characterized by a zone of residual petroleum saturation thicker than the transition zone predicted by [[capillary pressure]] tests. Shows in traps that have leaked are similar to those in spilled traps. Paleofluid contacts are usually flat, not tilted like spilled traps.