Changes

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File:Sedimentary-basin-analysis_fig4-5.png|{{figure number|1}}

File:Sedimentary-basin-analysis_fig4-5.png|{{figure number|1}}Map of hydrocarbon types based on analyses of more than 2000 oil, 600 gas, and 1200 seep samples correlated to specific source rocks. Modified from Gross et al. (1995).

File:Sedimentary-basin-analysis_fig4-45.png|{{figure number|2}}

File:Sedimentary-basin-analysis_fig4-45.png|{{figure number|2}}Time scale from Haq et al. (1988); DOW represents source rock, generation, and critical moment estimates (Dow et al., 1990).

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==Rate of accumulation==

==Rate of accumulation==

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File:Sedimentary-basin-analysis_fig4-32.png|{{figure number|3}}

File:Sedimentary-basin-analysis_fig4-32.png|{{figure number|3}}Rock thickness vs. time plot for nine key wells south of east- ern Louisiana within the area of the 6–4 Ma depocenter. After Piggott and Pulham (1993); courtesy Gulf Coast SEPM

File:Sedimentary-basin-analysis_fig4-33.png|{{figure number|4}}

File:Sedimentary-basin-analysis_fig4-33.png|{{figure number|4}}Rock accumulation rates for the Green Canyon 166 No. 1 well, as a histogram (lower graph) and as a set of burial history curves (upper graph). After Piggott and Pulham (1993); courtesy Gulf Coast SEPM.

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Accumulation of overburden above these five potential source rocks is shown by a dashed line on the events chart ([[:File:Sedimentary-basin-analysis_fig4-45.png|Figure 2]]), indicating no specific rate of accumulation until the interval of late [[Pliocene]] to [[Holocene]] sedimentation where rate variation is shown as defined by Piggott and Pulham.<ref name=ch04r75>Piggott, N., and A. Pulham, 1993, Sedimentation rate as the control on hydrocarbon sourcing, generation, and migration in the deepwater Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 14th Annual Research conference, p. 179–191.</ref> [[:File:Sedimentary-basin-analysis_fig4-32.png|Figures 3]] and [[:File:Sedimentary-basin-analysis_fig4-33.png|4]] indicate a major increase in rate of sediment accumulation occurred 6 Ma, which would accelerate burial of potential source rocks into the thermal zone for [[Petroleum generation|hydrocarbon generation]].

Accumulation of overburden above these five potential source rocks is shown by a dashed line on the events chart ([[:File:Sedimentary-basin-analysis_fig4-45.png|Figure 2]]), indicating no specific rate of accumulation until the interval of late [[Pliocene]] to [[Holocene]] sedimentation where rate variation is shown as defined by Piggott and Pulham.<ref name=ch04r75>Piggott, N., and A. Pulham, 1993, Sedimentation rate as the control on hydrocarbon sourcing, generation, and migration in the deepwater Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 14th Annual Research conference, p. 179–191.</ref> [[:File:Sedimentary-basin-analysis_fig4-32.png|Figures 3]] and [[:File:Sedimentary-basin-analysis_fig4-33.png|4]] indicate a major increase in rate of sediment accumulation occurred 6 Ma, which would accelerate burial of potential source rocks into the thermal zone for [[Petroleum generation|hydrocarbon generation]].

==Amount==

==Amount==

[[File:Sedimentary-basin-analysis_fig4-43.png|thumb|300px|{{figure number|5}}]]

[[File:Sedimentary-basin-analysis_fig4-43.png|thumb|300px|{{figure number|5}}North–south seismic section through the East Breaks 160-161 intraslope minibasin, showing the location of the East Breaks 160-161 field.]]

 

Drilling has documented that the East Breaks depocenter in the vicinity of the 160-161 field contains at least [[depth::15,000 ft]] (5000 m) of upper [[Miocene]] to [[Holocene]] sediment ([[:File:Sedimentary-basin-analysis_fig4-43.png|Figure 5]]). Dow et al.<ref name=ch04r29 /> use this thickness in calculating [[maturation]] and generation models. The thickness of overburden rock for any one of the older potential [[source rock]] intervals will be greater than [[depth::15,000 ft]] (5000 m), but the exact amount is highly speculative.

Drilling has documented that the East Breaks depocenter in the vicinity of the 160-161 field contains at least [[depth::15,000 ft]] (5000 m) of upper [[Miocene]] to [[Holocene]] sediment ([[:File:Sedimentary-basin-analysis_fig4-43.png|Figure 5]]). Dow et al.<ref name=ch04r29 /> use this thickness in calculating [[maturation]] and generation models. The thickness of overburden rock for any one of the older potential [[source rock]] intervals will be greater than [[depth::15,000 ft]] (5000 m), but the exact amount is highly speculative.