Changes

  | part    = Predicting the occurrence of oil and gas traps

  | part    = Predicting the occurrence of oil and gas traps

  | chapter = Exploring for stratigraphic traps

  | chapter = Exploring for stratigraphic traps

  | frompg  = 21-1

  | frompg  = 21-10

  | topg    = 21-68

  | topg    = 21-10

  | author  = John C. Dolson, Mike S. Bahorich, Rick C. Tobin, Edward A. Beaumont, Louis J. Terlikoski, Michael L. Hendricks

  | author  = John C. Dolson, Mike S. Bahorich, Rick C. Tobin, Edward A. Beaumont, Louis J. Terlikoski, Michael L. Hendricks

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch21/ch21.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch21/ch21.htm

}}

}}

[[file:exploring-for-stratigraphic-traps_fig21-5.png|left|thumb|{{figure number|1}}From unpublished data by R.C. Tobin, 1987.]]

[[Stratigraphic trap]] geometries can be mapped and defined at any geologic scale from an interpretation of [[facies]] in [[Seismic data|seismic]] or well data (see [[Basic open hole tools]] and [[Basic cased hole tools]]), but diagenetic overprints often modify primary [[Trap|trapping geometries]]. Diagenetic changes often can be predicted and mapped reliably, especially if they follow facies or paleostructure. However, if [[diagenesis]] does not follow facies or paleostructure, then the exploration and exploitation risk increases because predicting the trap location is more difficult.

Stratigraphic trap geometries can be mapped and defined at any geologic scale from an interpretation of fades in seismic or well data, but diagenetic overprints often modify primary trapping geometries. Diagenetic changes often can be predicted and mapped reliably, especially if they follow fades or paleostructure. However, if diagenesis does not follow fades or paleostructure, then the exploration and exploitation risk increases because predicting the trap location is more difficult.

[[file:exploring-for-stratigraphic-traps_fig21-5.png|left|300px|thumb|{{figure number|1}}From unpublished data by R.C. Tobin, 1987.]]

==Example==

==Example==

Access to core, samples, and modern wireline log suites greatly facilitates subsurface interpretation. In [[:file:exploring-for-stratigraphic-traps_fig21-5.png|Figure 1]], both lateral and top seals in the dolomite reservoir were created by anhydrite cementation during early diagenesis. Primary facies changes do not control the location of the trap.

Access to [[Overview of routine core analysis|cores]], [[Mudlogging: drill cuttings analysis|samples]], and modern wireline log suites greatly facilitates subsurface interpretation. In [[:file:exploring-for-stratigraphic-traps_fig21-5.png|Figure 1]], both [[lateral]] and top seals in the [[Carbonate|dolomite]] reservoir were created by [[anhydrite]] cementation during early diagenesis. Primary facies changes do not control the location of the trap.

==See also==

==See also==

* [[Stratigraphic trap]]s

* [[Stratigraphic trap]]s

* [[Exploring for stratigraphic traps]]

* [[Stratigraphic trap seals]]

* [[Importance of stratigraphic trap seals]]

* [[Scale importance]]

* [[Importance of scale]]

==External links==

==External links==

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Exploring for stratigraphic traps]]

[[Category:Exploring for stratigraphic traps]]