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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==== 2.2.1 Downstream accretion-dominated channel ====
 
==== 2.2.1 Downstream accretion-dominated channel ====
  
Channels dominated by downstream accretion form about 52 per cent of the succession and generally occurring in the lower parts of channel belts ([[:File:YGS_CHR_05_FLUV_FIG_04.jpg|Figure 4]], [[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]). Channels typically vary from 10 m to 20 m in thickness, although complete channel fills are rarely preserved because of erosion by overlying channels. They have widths in excess of the working area of the quarries (i.e. hundreds of metres or more). Channel bases are highly irregular and erosive, scouring down in places by up to 10 m, and typically have an overlying pebbly lag conglomerate composed of intraformational mudstone, coal and extraformational vein quartz, with minor chert and quartzite clasts. Sandstones form up to 95 per cent of the channel fill. This varies from fine- to coarse-grained, and is pebbly in places. In addition, intraformational mudstone, coal and rare siderite clasts occur. Siltstone is present, forming thin, laterally impersistent beds and laminae.
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Channels dominated by downstream accretion form about 52 per cent of the succession and generally occurring in the lower parts of channel belts ([[:File:YGS_CHR_05_FLUV_FIG_04.jpg|Figure 4]], [[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]). Channels typically vary from 10m to 20m in thickness, although complete channel fills are rarely preserved because of erosion by overlying channels. They have widths in excess of the working area of the quarries (i.e. hundreds of metres or more). Channel bases are highly irregular and erosive, scouring down in places by up to 10m, and typically have an overlying pebbly lag conglomerate composed of intraformational mudstone, coal and extraformational vein quartz, with minor chert and quartzite clasts. Sandstones form up to 95 per cent of the channel fill. This varies from fine- to coarse-grained, and is pebbly in places. In addition, intraformational mudstone, coal and rare siderite clasts occur. Siltstone is present, forming thin, laterally impersistent beds and laminae.
  
A variety of different bedforms and barforms occur. Both mid-channel and side-attached barforms are present, and simple and compound types can occur ([[:File:YGS_CHR_05_FLUV_TAB_02.jpg|Table 2]]). These barforms can be more than 12 m thick. Trough and planar-tabular cross bedding are common sedimentary structures ([[:File:YGS_CHR_05_FLUV_TAB_03.jpg|Table 3]]). Foreset and bounding-surface measurements generally show unidirectional trends (towards the northwest) and indicate that downstream accretion was the dominant process, although limited amounts of lateral accretion have been documented ([[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]).
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A variety of different bedforms and barforms occur. Both mid-channel and side-attached barforms are present, and simple and compound types can occur ([[:File:YGS_CHR_05_FLUV_TAB_02.jpg|Table 2]]). These barforms can be more than 12m thick. Trough and planar-tabular cross bedding are common sedimentary structures ([[:File:YGS_CHR_05_FLUV_TAB_03.jpg|Table 3]]). Foreset and bounding-surface measurements generally show unidirectional trends (towards the northwest) and indicate that downstream accretion was the dominant process, although limited amounts of lateral accretion have been documented ([[:File:YGS_CHR_05_FLUV_FIG_05.jpg|Figure 5]]).
  
 
==== 2.2.2 Lateral accretion-dominated channel ====
 
==== 2.2.2 Lateral accretion-dominated channel ====

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