Difference between revisions of "East Breaks critical moment"

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  | part    = Critical elements of the petroleum system
 
  | part    = Critical elements of the petroleum system
 
  | chapter = Sedimentary basin analysis
 
  | chapter = Sedimentary basin analysis
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  | frompg  = 4-83
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  | topg    = 4-123
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  | topg    = 4-84
 
  | author  = John M. Armentrout
 
  | author  = John M. Armentrout
 
  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm
 
  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch04/ch04.htm
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  | isbn    = 0-89181-602-X
 
  | isbn    = 0-89181-602-X
 
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Magoon and Dow.<ref name=ch04r61>Magoon, L., B., Dow, W., G., 1994, The [[Petroleum system]]: AAPG Memoir 60, p. 3–24.</ref> define the critical moment as the time that best depicts the generation-migration-accumulation of most hydrocarbons in a [[petroleum system]]. The East Breaks 160-161 field began to accumulate no earlier than 1.2 Ma when the trap began forming, and accumulation is inferred to continue to the present<ref name=ch04r29>Dow, W., G., Yukler, M., A., Senftle, J., T., Kennicutt, M., C., IIArmentrout, J., M., 1990, Miocene oil source beds in the East Breaks basin, Flex-Trend, offshore Texas: Proceedings, Gulf Coast Section SEPM 9th Annual Research conference, p. 139–150.</ref> The structural configuration has changed little since initial formation, so that the present-day map (Figure 4-42) and cross-sectional geometry (Figure 4-43) accurately depict the trapping aspects of the petroleum system.
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Magoon and Dow<ref name=ch04r61>Magoon, L. B., and W. G. Dow, 1994, The Petroleum System--From Source to Trap: [http://store.aapg.org/detail.aspx?id=1022 AAPG Memoir 60], p. 3–24.</ref> define the critical moment as the time that best depicts the [[Petroleum generation|generation]]-[[migration]]-[[accumulation]] of most hydrocarbons in a [[petroleum system]]. The East Breaks 160-161 field began to accumulate no earlier than 1.2 Ma when the trap began forming, and accumulation is inferred to continue to the present<ref name=ch04r29>Dow, W. G., M. A. Yukler, J. T. Senftle, M. C. Kennicutt, and J. M. Armentrout, 1990, Miocene oil source beds in the East Breaks basin, Flex-Trend, offshore Texas: Proceedings, Gulf Coast Section SEPM 9th Annual Research conference, p. 139–150.</ref> The structural configuration has changed little since initial formation, so that the present-day map ([[:File:Sedimentary-basin-analysis_fig4-42.png|Figure 1]]) and [[Cross section|cross-sectional geometry]] ([[:File:Sedimentary-basin-analysis_fig4-43.png|Figure 2]]) accurately depict the trapping aspects of the petroleum system.
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<gallery mode=packed heights=300px widths=300px>
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Sedimentary-basin-analysis_fig4-42.png|{{figure number|1}}Map of structural elements that define the East Breaks 160-161 minibasin, which is bound on the north by fault A, on the east by faults B and C, and on the south by a salt-cored high. Copyright of: Armentrout et al.;<ref>Armentrout, J. M., S. J. Malacek, P. Braithwaite, and C. R. Beeman, 1991, Seismic facies of slope basin turbidite reservoirs, East Breaks 160-161 field: Pliocene–Pleistocene, northwest- ern Gulf of Mexico, in P. Weimer and M. J. Link, eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 223–239.</ref> courtesy Springer-Verlag.
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File:Sedimentary-basin-analysis_fig4-43.png|{{figure number|2}}North–south seismic section through the East Breaks 160-161 intraslope minibasin, showing the location of the East Breaks 160-161 field.
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</gallery>
  
 
==Possible critical moments==
 
==Possible critical moments==
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According to the [[maturation]] model for a middle Miocene [[source rock]], peak oil generation would have begun 0.2 Ma<ref name=ch04r29 /> and the critical moment for the East Breaks 160-161 petroleum system would be 0.20 Ma (Figures 4-45 and 4-53). If a stratigraphically deeper lower Paleocene or upper Jurassic source rock is the origin of the East Breaks oils, an earlier onset of significant generation could have occurred with [[migration]], continuing to today and supplying the petroleum that has charged the field.
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[[File:Sedimentary-basin-analysis_fig4-45.png|thumb|300px|{{figure number|3}}Time scale from Haq et al.;<ref>Haq, B., J. Hardenbol, and P. R. Vail, 1988, Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change: SEPM Special Publication 42, p. 71–108.</ref> DOW represents source rock, generation, and critical moment estimates.<ref name=ch04r29 />]]
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[[File:Sedimentary-basin-analysis_fig4-53.png|thumb|300px|{{figure number|4}}1-D burial history/maturation plot showing the critical moment (2.0 Ma) and the time of oil generation (2.0 Ma to present) for the East Breaks 160-161 minibasin petroleum system, assuming that lower Miocene rocks have sourced the hydrocarbons. After Dow et al.;<ref name=ch04r29 />courtesy Gulf Coast SEPM.]]
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According to the [[maturation]] model for a middle Miocene [[source rock]], peak oil generation would have begun 0.2 Ma<ref name=ch04r29 /> and the critical moment for the East Breaks 160-161 petroleum system would be 0.20 Ma ([[:File:Sedimentary-basin-analysis_fig4-45.png|Figures 3]] and [[:File:Sedimentary-basin-analysis_fig4-53.png|4]]). If a stratigraphically deeper lower Paleocene or upper Jurassic source rock is the origin of the East Breaks oils, an earlier onset of significant generation could have occurred with [[migration]], continuing to today and supplying the petroleum that has charged the field.
  
 
==Summary==
 
==Summary==
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The critical moment will be different for the middle Miocene, lower Paleocene, and lower Tertiary source rock. The critical interval encompasses the composite of all critical moments. The critical interval for the East Breaks 160-161 petroleum system is 2.8 Ma to the present. It is that time period after deposition of the reservoir and seal during which subsequent growth fault movement formed the anticlinal trap and accumulation of migrating hydrocarbons occurred.
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The critical moment will be different for the [[middle Miocene]], [[lower Paleocene]], and lower [[Tertiary]] source rock. The critical interval encompasses the composite of all critical moments. The critical interval for the East Breaks 160-161 petroleum system is 2.8 Ma to the present. It is that time period after deposition of the reservoir and seal during which subsequent [[growth fault]] movement formed the anticlinal trap and accumulation of migrating hydrocarbons occurred.
  
 
==See also==
 
==See also==
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* [[East breaks petroleum system processes]]
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* [[East Breaks petroleum system]]
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* [[Trap formation]]
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* [[East Breaks trap formation]]
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* [[Geochemistry of two oils from east breaks]]
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* [[East Breaks geochemistry]]
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* [[Hydrocarbon generation model]]
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* [[East Breaks hydrocarbon generation model]]
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* [[Hydrocarbon migration model]]
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* [[East Breaks hydrocarbon migration model]]
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* [[Hydrocarbon accumulation model]]
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* [[East Breaks hydrocarbon accumulation model]]
  
 
==References==
 
==References==
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[[Category:Critical elements of the petroleum system]]  
 
[[Category:Critical elements of the petroleum system]]  
 
[[Category:Sedimentary basin analysis]]
 
[[Category:Sedimentary basin analysis]]
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[[Category:East Breaks]]
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[[Category:Treatise Handbook 3]]

Latest revision as of 17:07, 23 March 2022

Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Sedimentary basin analysis
Author John M. Armentrout
Link Web page
Store AAPG Store

Magoon and Dow[1] define the critical moment as the time that best depicts the generation-migration-accumulation of most hydrocarbons in a petroleum system. The East Breaks 160-161 field began to accumulate no earlier than 1.2 Ma when the trap began forming, and accumulation is inferred to continue to the present[2] The structural configuration has changed little since initial formation, so that the present-day map (Figure 1) and cross-sectional geometry (Figure 2) accurately depict the trapping aspects of the petroleum system.

  • Figure 1 Map of structural elements that define the East Breaks 160-161 minibasin, which is bound on the north by fault A, on the east by faults B and C, and on the south by a salt-cored high. Copyright of: Armentrout et al.;[3] courtesy Springer-Verlag.

  • Figure 2 North–south seismic section through the East Breaks 160-161 intraslope minibasin, showing the location of the East Breaks 160-161 field.

Possible critical moments

Figure 3 Time scale from Haq et al.;[4] DOW represents source rock, generation, and critical moment estimates.[2]
Figure 4 1-D burial history/maturation plot showing the critical moment (2.0 Ma) and the time of oil generation (2.0 Ma to present) for the East Breaks 160-161 minibasin petroleum system, assuming that lower Miocene rocks have sourced the hydrocarbons. After Dow et al.;[2]courtesy Gulf Coast SEPM.

According to the maturation model for a middle Miocene source rock, peak oil generation would have begun 0.2 Ma[2] and the critical moment for the East Breaks 160-161 petroleum system would be 0.20 Ma (Figures 3 and 4). If a stratigraphically deeper lower Paleocene or upper Jurassic source rock is the origin of the East Breaks oils, an earlier onset of significant generation could have occurred with migration, continuing to today and supplying the petroleum that has charged the field.

Summary

The critical moment will be different for the middle Miocene, lower Paleocene, and lower Tertiary source rock. The critical interval encompasses the composite of all critical moments. The critical interval for the East Breaks 160-161 petroleum system is 2.8 Ma to the present. It is that time period after deposition of the reservoir and seal during which subsequent growth fault movement formed the anticlinal trap and accumulation of migrating hydrocarbons occurred.

See also

References

  1. ↑ Magoon, L. B., and W. G. Dow, 1994, The Petroleum System--From Source to Trap: AAPG Memoir 60, p. 3–24.
  2. ↑ 2.0 2.1 2.2 2.3 Dow, W. G., M. A. Yukler, J. T. Senftle, M. C. Kennicutt, and J. M. Armentrout, 1990, Miocene oil source beds in the East Breaks basin, Flex-Trend, offshore Texas: Proceedings, Gulf Coast Section SEPM 9th Annual Research conference, p. 139–150.
  3. ↑ Armentrout, J. M., S. J. Malacek, P. Braithwaite, and C. R. Beeman, 1991, Seismic facies of slope basin turbidite reservoirs, East Breaks 160-161 field: Pliocene–Pleistocene, northwest- ern Gulf of Mexico, in P. Weimer and M. J. Link, eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 223–239.
  4. ↑ Haq, B., J. Hardenbol, and P. R. Vail, 1988, Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change: SEPM Special Publication 42, p. 71–108.

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