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| ==''Glob alt'' sequence deposition== | | ==''Glob alt'' sequence deposition== |
| + | <gallery> |
| + | file:sedimentary-basin-analysis_fig4-46.png|left|{{figure number|1}}Map of the 'Glob alt'' depositional sequence of Late Pliocene age. After Armentrout et al.<ref name=ArmentroutEtAl_1991 />. Courtesy Springer-Verlag. Original map by Charles R. Beeman, Mobil Oil, 1987. |
| + | File:Sedimentary-basin-analysis fig4-44.png|thumbnail|{{figure number|2}}Schematic diagram of the seismic reflection profile along the west side of the East Breaks 160-161 field. From Armentrout & Clement, 1990; Courtesy Gulf Coast SEPM. |
| + | file:sedimentary-basin-analysis_fig4-47.png|thumb|{{figure number|3}}Seismic reflection profile showing the ''Glob alt'' reservoir interval. After 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. |
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− | [[File:Sedimentary-basin-analysis fig4-44.png|thumbnail|{{figure number|1}}See text for explanation.]] | + | The ''Glob alt'' depositional sequence of Late Pliocene age (mapped in [[:file:sedimentary-basin-analysis_fig4-46.png|Figure 1]]) is part of depositional cycle 2 in [[:file:sedimentary-basin-analysis_fig4-44.png|Figure 2]]. The sequence, deposited on a relatively open slope with only slightly undulating sea-floor topography, thins rapidly basinward due to sediment starvation in the most distal areas of the High Island-East Breaks depocenter ([[:file:sedimentary-basin-analysis_fig4-47.png|Figure 3]]). Subsequent progradation resulted in differential loading of the allochthonous salt and formation of local depocenters between downloaded growth fault sediment prisms and differentially displaced salt-cored anticlines. |
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− | [[file:sedimentary-basin-analysis_fig4-47.png|thumb|{{figure number|2}}After 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.]]
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− | The ''Glob alt'' depositional sequence of Late Pliocene age (mapped below) is part of depositional cycle 2 in [[:file:sedimentary-basin-analysis_fig4-44.png|Figure 1]]. The sequence, deposited on a relatively open slope with only slightly undulating sea-floor topography, thins rapidly basinward due to sediment starvation in the most distal areas of the High Island-East Breaks depocenter ([[:file:sedimentary-basin-analysis_fig4-47.png|Figure 2]]). Subsequent progradation resulted in differential loading of the allochthonous salt and formation of local depocenters between downloaded growth fault sediment prisms and differentially displaced salt-cored anticlines.
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| ==''Glob alt'' isochron and seismic facies map== | | ==''Glob alt'' isochron and seismic facies map== |
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| ==Well-log cross section== | | ==Well-log cross section== |
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− | [[file:sedimentary-basin-analysis_fig4-46.png|left|thumb|{{figure number|3}}After Armentrout et al.<ref name=ArmentroutEtAl_1991 />. Courtesy Springer-Verlag. Original map by Charles R. Beeman, Mobil Oil, 1987.]]
| + | The following figure is a well-log cross section of the ''Glob alt'' reservoir interval; datum is a mudstone within the GA-2 sandstone (well locations are shown on [[:file:sedimentary-basin-analysis_fig4-46.png|Figure 1a]]). All logs are spontaneous potential with true vertical depth displays. The GA-4 reservoir sand is below the displayed interval. Log profiles are annotated: arrow C = funnel-shaped, coarsening-upward sandstone; arrow F = bell-shaped, fining-upward sandstone; parallel lines B = blocky profile of relatively thick sandstones and thin mudstone interbeds. |
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− | The following figure is a well-log cross section of the ''Glob alt'' reservoir interval; datum is a mudstone within the GA-2 sandstone (well locations are shown on [[:file:sedimentary-basin-analysis_fig4-46.png|Figure 3]]). All logs are spontaneous potential with true vertical depth displays. The GA-4 reservoir sand is below the displayed interval. Log profiles are annotated: arrow C = funnel-shaped, coarsening-upward sandstone; arrow F = bell-shaped, fining-upward sandstone; parallel lines B = blocky profile of relatively thick sandstones and thin mudstone interbeds. | |
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| [[file:sedimentary-basin-analysis_fig4-48.png|thumb|{{figure number|4}}After Armentrout et al.<ref name=ArmentroutEtAl_1991 />. Courtesy Springer-Verlag.]] | | [[file:sedimentary-basin-analysis_fig4-48.png|thumb|{{figure number|4}}After Armentrout et al.<ref name=ArmentroutEtAl_1991 />. Courtesy Springer-Verlag.]] |