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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 = Critical elements of the petroleum system
| chapter = Sedimentary basin analysis
| frompg = 4-1
| topg = 4-123
| author = John M. Armentrout
| link = http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
==Description==
The deepwater sands of the ''Glob alt'' reservoir are encased in hemipelagic mudstones and have a top seal associated with the condensed section of the ''Glob alt'' depositional cycle.<ref name=ch04r7>Armentrout, J., M., 1991, Paleontological constraints on depositional [[modeling]]: examples of integration of biostratigraphy and seismic stratigraphy, Pliocene–Pleistocene, Gulf of Mexico, in Weimer, P., Link, M., H., eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 137–170.</ref> The well-log cross section in Figure 4-48 shows the correlation of the ''Glob alt'' sandstones. The top seal, which occurs above the log cross section, is a major mudstone condensed interval coincident with the ''Glob alt'' datum labeled on Figure 4-47. Precondensed section mudstones encasing the ''Glob alt'' sandstones provide local top seal and lateral seal.
==Effectiveness==
The top seal of the ''Glob alt'' reservoir is especially effective because it is thick and has a regional extent as a consequence of its position at a third-order turnaround from regression to transgression. This turnaround is from regressive cycles 3.4–3.5–3.6 to transgressive cycles 3.7–3.8 on the Haq et al.<ref name=ch04r43>Haq, B., Hardenbol, J., Vail, P., R., 1988, Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change: SEPM Special Publication 42, p. 71–108.</ref> cycle chart (see Figure 4-25).
Despite its regional extent and thickness, hydrocarbons have leaked upward into the ''Hyal B'' and ''Trim A'' reservoirs, most probably along faults during intervals of fault movement with consequent dilation of fracture networks along the fault
==Carrier beds and seal evaluation==
Impermeable rocks also affect [[[[migration]] pathways]]. Porous and permeable beds bounded above and below by impermeable rocks can provide highly effective hydrocarbon carrier beds.
==See also==
* [[East breaks petroleum system elements]]
* [[Reservoir rock]]
* [[Overburden rock]]
* [[Source rock]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Critical elements of the petroleum system]]
[[Category:Sedimentary basin analysis]]
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Critical elements of the petroleum system
| chapter = Sedimentary basin analysis
| frompg = 4-1
| topg = 4-123
| author = John M. Armentrout
| link = http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
==Description==
The deepwater sands of the ''Glob alt'' reservoir are encased in hemipelagic mudstones and have a top seal associated with the condensed section of the ''Glob alt'' depositional cycle.<ref name=ch04r7>Armentrout, J., M., 1991, Paleontological constraints on depositional [[modeling]]: examples of integration of biostratigraphy and seismic stratigraphy, Pliocene–Pleistocene, Gulf of Mexico, in Weimer, P., Link, M., H., eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 137–170.</ref> The well-log cross section in Figure 4-48 shows the correlation of the ''Glob alt'' sandstones. The top seal, which occurs above the log cross section, is a major mudstone condensed interval coincident with the ''Glob alt'' datum labeled on Figure 4-47. Precondensed section mudstones encasing the ''Glob alt'' sandstones provide local top seal and lateral seal.
==Effectiveness==
The top seal of the ''Glob alt'' reservoir is especially effective because it is thick and has a regional extent as a consequence of its position at a third-order turnaround from regression to transgression. This turnaround is from regressive cycles 3.4–3.5–3.6 to transgressive cycles 3.7–3.8 on the Haq et al.<ref name=ch04r43>Haq, B., Hardenbol, J., Vail, P., R., 1988, Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change: SEPM Special Publication 42, p. 71–108.</ref> cycle chart (see Figure 4-25).
Despite its regional extent and thickness, hydrocarbons have leaked upward into the ''Hyal B'' and ''Trim A'' reservoirs, most probably along faults during intervals of fault movement with consequent dilation of fracture networks along the fault
==Carrier beds and seal evaluation==
Impermeable rocks also affect [[[[migration]] pathways]]. Porous and permeable beds bounded above and below by impermeable rocks can provide highly effective hydrocarbon carrier beds.
==See also==
* [[East breaks petroleum system elements]]
* [[Reservoir rock]]
* [[Overburden rock]]
* [[Source rock]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Critical elements of the petroleum system]]
[[Category:Sedimentary basin analysis]]