Changes

==East breaks migration model==

==East breaks migration model==

[[file:Sedimentary-basin-analysis_fig4-55.png|thumb|{{figure number|1}}Based on data from Lovely and Ruggiero (1995, personal communication).]]

[[file:Sedimentary-basin-analysis_fig4-55.png|thumb|{{figure number|1}}North-south seismic section showing the hypothetical model for migration pathways within the East Breaks 160-161 field. Based on data from Lovely and Ruggiero (1995, personal communication).]]

 

[[file:Sedimentary-basin-analysis_fig4-42.png|thumb|{{figure number|2}}Location of Figure 1. From Armentrout et al.<ref name=Armentroutetal_1991>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, northwestern 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.]]

[[file:Sedimentary-basin-analysis_fig4-42.png|thumb|{{figure number|2}}From Armentrout et al.<ref name=Armentroutetal_1991>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, northwestern 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.]]

Using these hypothetical migration avenues, a migration pathway model has been constructed for the East Breaks 160-161 minibasin. Dow et al.<ref name=ch04r29 /> present temperature information, indicating an elevated thermal gradient in the block 160-A-29 well where it is in close proximity to salt. Additionally, the A-29 borehole mud weight of [[weight::13.5 lb]] below [[depth::5,000 ft]] (1524 m) and [[weight::15.7 lb]] below [[depth::7,000 ft]] (2134 m) and mathematical [[modeling]] suggest probable overpressure and undercompacted sediments below a depth of [[depth::10,000 ft]] (3048 m). The consequent thermal and geopressure gradient would drive fluid flow from depth up migration pathways into available reservoirs.

[[:file:Sedimentary-basin-analysis fig4-55.png|Figure 1]] is a north-south seismic section showing the hypothetical model for migration pathways within the East Breaks 160-161 field (see [[:file:Sedimentary-basin-analysis fig4-42.png|Figure 2]] for location). Fault conduits allow upward migration from high-pressure, thermally mature probable source rocks into the intersected gravity-flow sandstone reservoirs at the ''Glob alt, Hyal B'', and ''Trim A'' horizons. The ''Glob M'' horizon between the ''Glob alt'' and ''Hyal B'' horizons is productive from sands in the East Breaks 158-159 field [[length::6 mi]] (about 10 km) to the west within the same minibasin.

[[:file:Sedimentary-basin-analysis fig4-55.png|Figure 1]] is a north-south seismic section showing the hypothetical model for migration pathways within the East Breaks 160-161 field (see [[:file:Sedimentary-basin-analysis fig4-42.png|Figure 2]] for location). Fault conduits allow upward migration from high-pressure, thermally mature probable source rocks into the intersected gravity-flow sandstone reservoirs at the ''Glob alt, Hyal B'', and ''Trim A'' horizons. The ''Glob M'' horizon between the ''Glob alt'' and ''Hyal B'' horizons is productive from sands in the East Breaks 158-159 field [[length::6 mi]] (about 10 km) to the west within the same minibasin.