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Sequence stratigraphy: hierarchy of sequences (view source)
Revision as of 17:32, 22 January 2014
, 17:32, 22 January 2014Initial import
{{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 = Exploring for stratigraphic traps
| frompg = 21-1
| topg = 21-68
| 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
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
Global sea level changes (eustacy) are cyclic phenomena. Six orders of sea level cycles are recognized from stratigraphic evidence.<ref name=ch21r47>Van Wagoner, J., C., Mitchum, R., M., Campion, K., M., Rahmanian, V., D., 1990, Siliciclastic [[Sequence stratigraphy]] in Well Logs, Cores and Outcrops: Concepts for High-Resolution Correlation of Time and Facies: AAPG Methods in Exploration Series No. 7, 55 p.</ref> Third-, fourth-, and fifth-order sea level cycles model sequence deposition for petroleum exploration. A third-order sequence is a composite of fourth- and fifth-order sequences.
The table below shows sea level cycle frequencies, thickness ranges, and stratigraphic names for third-, fourth-, and fifth-order sequences.
{| class = "wikitable"
|-
! Sequence order
! Cycle frequency, M. Y
! Thickness, m
! Stratigraphic name
|-
| Third
| 0.5–5
| 100–1000
| Sequence
|-
| Fourth
| 0.1–0.5
| 1–10
| Parasequence
|-
| Fifth
| 0.01–0.1
| 1–10
| Parasequence
|}
==Superimposition of cycles==
Several frequencies, representing different orders of sea level cycles, are superimposed on one another to make a composite sea level cycle curve. For stratigraphic trap exploration, cycles that impact trap location are usually third-, fourth-, and fifth-order sea level cycles. The figure below shows how adding third-, fourth-, and fifth-order cycles together will produce a composite curve.
[[file:exploring-for-stratigraphic-traps_fig21-7.png|thumb|{{figure number|21-7}}.]]
==See also==
* [[Sequence stratigraphy]]
* [[Basics of sequence stratigraphy]]
* [[Third-order sequences]]
* [[Fourth- and fifth-order sequences (Parasequences)]]
* [[Traps in a framework of sequence stratigraphy]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch21/ch21.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:Exploring for stratigraphic traps]]
| 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 = Exploring for stratigraphic traps
| frompg = 21-1
| topg = 21-68
| 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
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
Global sea level changes (eustacy) are cyclic phenomena. Six orders of sea level cycles are recognized from stratigraphic evidence.<ref name=ch21r47>Van Wagoner, J., C., Mitchum, R., M., Campion, K., M., Rahmanian, V., D., 1990, Siliciclastic [[Sequence stratigraphy]] in Well Logs, Cores and Outcrops: Concepts for High-Resolution Correlation of Time and Facies: AAPG Methods in Exploration Series No. 7, 55 p.</ref> Third-, fourth-, and fifth-order sea level cycles model sequence deposition for petroleum exploration. A third-order sequence is a composite of fourth- and fifth-order sequences.
The table below shows sea level cycle frequencies, thickness ranges, and stratigraphic names for third-, fourth-, and fifth-order sequences.
{| class = "wikitable"
|-
! Sequence order
! Cycle frequency, M. Y
! Thickness, m
! Stratigraphic name
|-
| Third
| 0.5–5
| 100–1000
| Sequence
|-
| Fourth
| 0.1–0.5
| 1–10
| Parasequence
|-
| Fifth
| 0.01–0.1
| 1–10
| Parasequence
|}
==Superimposition of cycles==
Several frequencies, representing different orders of sea level cycles, are superimposed on one another to make a composite sea level cycle curve. For stratigraphic trap exploration, cycles that impact trap location are usually third-, fourth-, and fifth-order sea level cycles. The figure below shows how adding third-, fourth-, and fifth-order cycles together will produce a composite curve.
[[file:exploring-for-stratigraphic-traps_fig21-7.png|thumb|{{figure number|21-7}}.]]
==See also==
* [[Sequence stratigraphy]]
* [[Basics of sequence stratigraphy]]
* [[Third-order sequences]]
* [[Fourth- and fifth-order sequences (Parasequences)]]
* [[Traps in a framework of sequence stratigraphy]]
==References==
{{reflist}}
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch21/ch21.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:Exploring for stratigraphic traps]]