Changes

* Few empirical field studies compare the predicted and observed [[hydrocarbon column]] heights. This is worrisome because idealized laboratory experiments have significant errors in the predicted hydrocarbon column heights.

* Few empirical field studies compare the predicted and observed [[hydrocarbon column]] heights. This is worrisome because idealized laboratory experiments have significant errors in the predicted hydrocarbon column heights.

* [[Saturations required for hydrocarbon flow|Hydrocarbon saturations required for flow]] through top seals—and, consequently, displacement pressures—may be much higher than commonly assumed.

* [[Saturations required for hydrocarbon flow|Hydrocarbon saturations required for flow]] through top seals—and, consequently, displacement pressures—may be much higher than commonly assumed.

* Hydrocarbon columns beneath breached seals and hydrocarbon-wet seals may not be related to the capillary properties of the seal in any easily understood way.

* Hydrocarbon columns beneath breached seals and [[Seal capacity of breached and hydrocarbon-wet seals|hydrocarbon-wet seals]] may not be related to the capillary properties of the seal in any easily understood way.

* [http://en.wikipedia.org/wiki/Diffusion Diffusion] can cause loss of large volumes of gas but not oil through a top seal.

* [http://en.wikipedia.org/wiki/Diffusion Diffusion] can cause loss of large volumes of gas but not oil through a top seal.

* Hydrodynamic flow can alter top seal capacity.

* Hydrodynamic flow can alter top seal capacity.