Difference between revisions of "Seal capacity: pitfalls and limitations of estimation"
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− | Although it is tantalizing to be able to measure the capillary properties of a seal and then assess hydrocarbon volumes, some practical problems exist: | + | Although it is tantalizing to be able to measure the [[Capillary pressure|capillary properties]] of a [[Seal capacity of different rock types|seal]] and then assess hydrocarbon volumes, some practical problems exist: |
− | * It is not easy to characterize the displacement pressure of a top seal from a few, or many, measurements. | + | * It is not easy to characterize the [[Top seal displacement pressure|displacement pressure]] of a top seal from a few, or many, measurements. |
− | * 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. |
− | * 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 hydrocarbon-wet seals may not be related to the capillary properties of the seal in any easily understood way. | ||
− | * Diffusion can cause loss of large volumes of gas but not oil through a top seal. | + | * |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. | ||
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* [[Seal capacity of breached and hydrocarbon-wet seals]] | * [[Seal capacity of breached and hydrocarbon-wet seals]] | ||
* [[Hydrodynamic flow and pressure transients]] | * [[Hydrodynamic flow and pressure transients]] | ||
+ | * [[Top seal displacement pressure]] | ||
+ | * [[Diffusive seal leakage]] | ||
==External links== | ==External links== |
Revision as of 14:25, 30 April 2014
Exploring for Oil and Gas Traps | |
Series | Treatise in Petroleum Geology |
---|---|
Part | Predicting the occurrence of oil and gas traps |
Chapter | Evaluating top and fault seal |
Author | Grant M. Skerlec |
Link | Web page |
Store | AAPG Store |
Although it is tantalizing to be able to measure the capillary properties of a seal and then assess hydrocarbon volumes, some practical problems exist:
- It is not easy to characterize the displacement pressure of a top seal from a few, or many, measurements.
- 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.
- 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.
- |Diffusion can cause loss of large volumes of gas but not oil through a top seal.
- Hydrodynamic flow can alter top seal capacity.
See also
- [[Difficulty of characterizing pd of a seal]]
- Does the theory predict reality?
- Saturations required for hydrocarbon flow
- Seal capacity of breached and hydrocarbon-wet seals
- Hydrodynamic flow and pressure transients
- Top seal displacement pressure
- Diffusive seal leakage