Editing Fluvial sandbody architecture, cyclicity and sequence stratigraphic setting – implications for hydrocarbon reservoirs: the Westphalian C and D of the Osnabrück–Ibbenbüren area, northwest Germany

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{{YGSCarbHydroRes}}
 
{{YGSCarbHydroRes}}
  
[[File:YGS_CHR_05_FLUV_FIG_01.jpg|thumbnail|Figure 1 Main structural elements of part of the West European Carboniferous Basin . Inset map shows the location of the main Upper Carboniferous (Bolsovian and Westphalian D) outcrops in the northwestern part of Germany described in this paper. Wells A–D are illustrated in Figure 7.]]
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[[File:YGS_CHR_05_FLUV_FIG_01.jpg|thumbnail|Figure 1 Main structural elements of part of the West European Carboniferous Basin (based mainly on Hedemann & Teichmüller (1971) and Maynard et al. (1997). Inset map shows the location of the main Upper Carboniferous (Bolsovian and Westphalian D) outcrops in the northwestern part of Germany described in this paper. Wells A–D are illustrated in Figure 7.]]
 
[[File:YGS_CHR_05_FLUV_FIG_02.jpg|thumbnail|Figure 2 Stratigraphy of the Ibbenbüren area (modified from David 1990).]]
 
[[File:YGS_CHR_05_FLUV_FIG_02.jpg|thumbnail|Figure 2 Stratigraphy of the Ibbenbüren area (modified from David 1990).]]
 
[[File:YGS_CHR_05_FLUV_FIG_03.jpg|thumbnail|Figure 3 (a) Gamma-ray geophysical log correlation of wells between South Oldenburg and the Ems area of northern Germany to show the first-order scale of cyclicity in the upper Bolsovian to lower Westphalian D successions (b) Gamma-ray geophysical log correlation of wells from the South Oldenburg area of northern Germany to show the lateral correlation of sandbodies in second- and third-order cycles.]]
 
[[File:YGS_CHR_05_FLUV_FIG_03.jpg|thumbnail|Figure 3 (a) Gamma-ray geophysical log correlation of wells between South Oldenburg and the Ems area of northern Germany to show the first-order scale of cyclicity in the upper Bolsovian to lower Westphalian D successions (b) Gamma-ray geophysical log correlation of wells from the South Oldenburg area of northern Germany to show the lateral correlation of sandbodies in second- and third-order cycles.]]
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[[File:YGS_CHR_05_FLUV_FIG_08.jpg|thumbnail|Figure 8 Plate-tectonic model for the Late Carboniferous (Sudetian and Asturian) phase of the Variscan orogeny. This shows the final amalgamation of Pangaea as a result of the indentation and formation of the Iberian–Armorican arc.]]
 
[[File:YGS_CHR_05_FLUV_FIG_08.jpg|thumbnail|Figure 8 Plate-tectonic model for the Late Carboniferous (Sudetian and Asturian) phase of the Variscan orogeny. This shows the final amalgamation of Pangaea as a result of the indentation and formation of the Iberian–Armorican arc.]]
 
[[File:YGS_CHR_05_FLUV_FIG_09.jpg|thumbnail|Figure 9 Isopach map (in kilometres) of the thickness of Westphalian strata in northern Germany and the southern North Sea. ]]
 
[[File:YGS_CHR_05_FLUV_FIG_09.jpg|thumbnail|Figure 9 Isopach map (in kilometres) of the thickness of Westphalian strata in northern Germany and the southern North Sea. ]]
[[File:YGS_CHR_05_FLUV_FIG_10.jpg|thumbnail|Figure 10 Schematic model to show the down-dip (proximal to distal) variations in sedimentary architecture within one first-order cycle. (a) Table of the main characteristics. (b) Cross section of one first-order cycle to illustrate the retrogressive stacking pattern of second-order cycles and the variations in gross architecture from a proximal to distal setting as a function of variations in sediment flux and accommodation space generation. (c) Proximal to distal variations in the likely sandbody stacking pattern generated in one second-order cycle. ]]
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[[File:YGS_CHR_05_FLUV_FIG_10.jpg|thumbnail|Figure 10 Schematic model to show the down-dip (proximal to distal) variations in sedimentary architecture within one first-order cycle. (a) Table of the main characteristics. (b) Cross section of one first-order cycle to illustrate the retrogressive stacking pattern of second-order cycles and the variations in gross architecture from a proximal to distal setting as a function of variations in sediment flux and accommodation space generation. (c) Proximal to distal variations in the likely sandbody stacking pattern generated in one second-order cycle. These are drawn at the same scale for simplicity, although variations in accommodation space would make it unlikely that they would all have the same thickness. The approximate length of each zone is uncertain, but is likely to vary from 60–100km.]]
 
[[File:YGS_CHR_05_FLUV_TAB_01.jpg|thumbnail|Table 1 Facies associations and facies recognized from the Upper Carboniferous in the Osnabrück–Ibbenbüren area.]]
 
[[File:YGS_CHR_05_FLUV_TAB_01.jpg|thumbnail|Table 1 Facies associations and facies recognized from the Upper Carboniferous in the Osnabrück–Ibbenbüren area.]]
 
[[File:YGS_CHR_05_FLUV_TAB_02.jpg|thumbnail|Table 2 Main types of barform channel elements recognized from the Upper Carboniferous succession in northern Germany.]]
 
[[File:YGS_CHR_05_FLUV_TAB_02.jpg|thumbnail|Table 2 Main types of barform channel elements recognized from the Upper Carboniferous succession in northern Germany.]]

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