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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=== 2.1 Channel belts ===
 
=== 2.1 Channel belts ===
  
The term “channel belt” describes compound sandbodies comprising the deposits of separate channels that amalgamate to form multi-storey and multi-lateral units. Channel belts are of large lateral extent and thickness (tens of kilometres in width and up to 50 m in thickness) and rest on laterally extensive erosion surfaces. Geophysical log correlations demonstrate that these surfaces are correlatable for many kilometres, possibly even tens of kilometres parallel to flow ([[:File:YGS_CHR_05_FLUV_FIG_03.jpg|Figure 3]]). In the Piesberg quarry, four channel belts are identified, although only the lowermost few metres of the top one is exposed ([[:File:YGS_CHR_05_FLUV_FIG_04.jpg|Figure 4]]).
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The term “channel belt” describes compound sandbodies comprising the deposits of separate channels that amalgamate to form multi-storey and multi-lateral units. Channel belts are of large lateral extent and thickness (tens of kilometres in width and up to 50m in thickness) and rest on laterally extensive erosion surfaces. Geophysical log correlations demonstrate that these surfaces are correlatable for many kilometres, possibly even tens of kilometres parallel to flow ([[:File:YGS_CHR_05_FLUV_FIG_03.jpg|Figure 3]]). In the Piesberg quarry, four channel belts are identified, although only the lowermost few metres of the top one is exposed ([[:File:YGS_CHR_05_FLUV_FIG_04.jpg|Figure 4]]).
  
 
Within each channel belt ([[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]) it is possible to work out a chronology of channels based on the occurrence of cross-cutting erosion surfaces. The internal architecture of each channel sand-body can be described in terms of large-scale channel elements, of which barforms are the most important. Barforms are macro-forms that scale in width and depth to that of the channel in which they formed and they represent long-term products of river systems (American Society of Civil Engineers 1963, Bridge 1985). These are described in more detail in Tables 2 and 3.
 
Within each channel belt ([[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]) it is possible to work out a chronology of channels based on the occurrence of cross-cutting erosion surfaces. The internal architecture of each channel sand-body can be described in terms of large-scale channel elements, of which barforms are the most important. Barforms are macro-forms that scale in width and depth to that of the channel in which they formed and they represent long-term products of river systems (American Society of Civil Engineers 1963, Bridge 1985). These are described in more detail in Tables 2 and 3.

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