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{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Predicting the occurrence of oil and gas traps
| chapter = Evaluating top and fault seal
| frompg = 10-1
| topg = 10-94
| author = Grant M. Skerlec
| link = http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
In practice, the displacement pressure is estimated from laboratory measurements. In real rocks, the single pore-throat radius of the equations on page 10–68 is replaced by a complex pore-throat size distribution.

==Estimating techniques==
The following table lists techniques commonly used to estimate the displacement pressure of a top seal.

{| class = "wikitable"
|-
! Technique
! Needed for the technique
|-
| Mercury injection measurements
| Cores or cuttings
|-
| Log analysis
| Logs and database of laboratory measurements
|-
| Sedimentary facies
| Facies maps and database of laboratory measurements
|-
| Pore-size distribution
| Thin sections, cores, or cuttings
|}

==See also==
This subsection contains the following topics which correlate with the techniques listed in the table above.

* [[Measuring p<sub>d</sub> using mercury injection]]
* [[Estimating seal capacity from sedimentary facies and well logs]]
* [[Estimating p<sub>d</sub> from pore size]]

==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]

[[Category:Predicting the occurrence of oil and gas traps]]
[[Category:Evaluating top and fault seal]]

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