Changes

==Typical settings for deep-water marine reservoirs==

==Typical settings for deep-water marine reservoirs==

[[File:M91FG193.JPG|thumb|300px|{{figure number|1}} Depositional model for channelized turbidites and a basin-floor fan complex, Brushy Canyon, Texas. From Beaubouef (1999). Reprinted with permission from the AAPG.]]

[[File:M91FG193.JPG|thumb|300px|{{figure number|1}} Depositional model for channelized turbidites and a basin-floor fan complex, Brushy Canyon, Texas. From Beaubouef<ref name=Beaubouef1999>Beaubouef, R. T., C. Rossen, F. B. Zelt, M. D. Sullivan, D. C. Mohrig, and G. D. C. Jennette, 1999, Field guide for AAPG Hedberg field Research Conference, April 15–20, 1999, Deep-water sandstones, Brushy Canyon Formation, west Texas: AAPG Continuing Education Course Note Series 40, 48 p.</ref>. Reprinted with permission from the AAPG.]]

The main settings include

The main settings include

Connectivity between individual channels will depend on how much shale is present. The effect of increasing shale content is to reduce vertical connectivity through sand-on-sand contacts and also to increase lateral variability.<ref name=WeimerandSlatt />

Connectivity between individual channels will depend on how much shale is present. The effect of increasing shale content is to reduce vertical connectivity through sand-on-sand contacts and also to increase lateral variability.<ref name=WeimerandSlatt />

Shales may be present either as extensive late-stage channel-fill shales or as shale drapes at the base of the channels. They may be composed of mudstone, siltstone, or heterolithic sediments ([[:File:M91FG194.JPG|Figure 2b]]) (Beaubouef et al., 1999). Simulation modeling indicates that shale drapes may be a significant feature reducing connectivity between channel complexes and impairing the recovery efficiency (Larue, 2004). This mechanism has been invoked to explain why channel margins in the Forties field, UK North Sea, appear to act as baffles to fluid flow (Vaughan et al., 2007).

Shales may be present either as extensive late-stage channel-fill shales or as shale drapes at the base of the channels. They may be composed of mudstone, siltstone, or heterolithic sediments ([[:File:M91FG194.JPG|Figure 2b]]).<ref name=Beaubouef1999 /> Simulation modeling indicates that shale drapes may be a significant feature reducing connectivity between channel complexes and impairing the recovery efficiency (Larue, 2004). This mechanism has been invoked to explain why channel margins in the Forties field, UK North Sea, appear to act as baffles to fluid flow (Vaughan et al., 2007).

According to Weimer and Slatt,<ref name=WeimerandSlatt /> the width to thickness ratio of channels typically ranges from 10:1 to 300:1.

According to Weimer and Slatt,<ref name=WeimerandSlatt /> the width to thickness ratio of channels typically ranges from 10:1 to 300:1.