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Line 35: + + − Well-log correlations within the ''Glob alt'' isochron thick show a succession of aggrading sandstone bodies (Figure 4-48). Figure 4-49 shows net sandstone isopachs for reservoir units of the ''Glob alt'' sandstone interval. The stratigraphic succession from top to bottom reservoir sandstone is 1, 1.1, 2, 2.2, 3, and 4. Maps of each sandstone interval document lobate deposition within the minibasin. Individual lobe development shows compensation lobe switching as progressively younger deposits infill the mud-rich/sand-poor intralobe areas of the preceding lobe. − + − +
East Breaks reservoir rock (view source)
Revision as of 15:25, 5 February 2014
, 15:25, 5 February 2014→Net sandstone isopachs
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.
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.
[[file:sedimentary-basin-analysis_fig4-48.png|thumb|{{figure number|4}}After Armentrout et al.<ref name=ch04r7 />). Copyright: Springer-Verlag.]]
==Net sandstone isopachs==
==Net sandstone isopachs==
[[file:sedimentary-basin-analysis_fig4-48.png|thumb|{{figure number|4-48}}After Armentrout et al.<ref name=ch04r7 />). Copyright: Springer-Verlag.]]
[[file:sedimentary-basin-analysis_fig4-49.png|left|thumb|{{figure number|5}}. Copyright: Armentrout et al. (1991); courtesy Springer-Verlag.]]
[[file:sedimentary-basin-analysis_fig4-49.png|thumb|{{figure number|4-49}}. Copyright: Armentrout et al. (1991); courtesy Springer-Verlag.]]
Well-log correlations within the ''Glob alt'' isochron thick show a succession of aggrading sandstone bodies ([[:file:sedimentary-basin-analysis_fig4-48.png|Figure 4]]). [[:file:sedimentary-basin-analysis_fig4-49.png|Figure 5]] shows net sandstone isopachs for reservoir units of the ''Glob alt'' sandstone interval. The stratigraphic succession from top to bottom reservoir sandstone is 1, 1.1, 2, 2.2, 3, and 4. Maps of each sandstone interval document lobate deposition within the minibasin. Individual lobe development shows compensation lobe switching as progressively younger deposits infill the mud-rich/sand-poor intralobe areas of the preceding lobe.
The patterns mapped on the figure suggest lower thin lobate sheets (GA-4, GA-3, and GA-2.2), an intermediate thick lobe of amalgamated blocky sandstones (GA-2), and an upper moderately thick, bilobed leveed-channel system (GA-1.1 and GA-1). Net sandstone isopach contours are [[length::10 ft]] (3 m); the scale bar is [[depth::3000 ft]] (1000 m).
The patterns mapped on the figure suggest lower thin lobate sheets (GA-4, GA-3, and GA-2.2), an intermediate thick lobe of amalgamated blocky sandstones (GA-2), and an upper moderately thick, bilobed leveed-channel system (GA-1.1 and GA-1). Net sandstone isopach contours are [[length::10 ft]] (3 m); the scale bar is [[depth::3000 ft]] (1000 m).