Changes

==Production from channel-levee complexes==

==Production from channel-levee complexes==

Channel-levee complexes can show highly variable continuity between the channels and levees (Figure 195). It is common for hydrocarbons in the channel-fill sandstones to be poorly connected with the levee sediments. The channel fills may be younger than the levees themselves, and the beds in the proximal levee deposits may be discontinuous (Cronin et al., 2000; Beaubouef, 2004). Kneller et al. (2007) noted that collapse structures, including rotated blocks, slide sheets, slump folds, and thick debris flows, are common on levee margins and may contribute to poor reservoir continuity.

Channel-levee complexes can show highly variable continuity between the channels and levees ([[:File:M91FG195.JPG|Figure 3]]). It is common for hydrocarbons in the channel-fill sandstones to be poorly connected with the levee sediments. The channel fills may be younger than the levees themselves, and the beds in the proximal levee deposits may be discontinuous (Cronin et al., 2000; Beaubouef, 2004). Kneller et al. (2007) noted that collapse structures, including rotated blocks, slide sheets, slump folds, and thick debris flows, are common on levee margins and may contribute to poor reservoir continuity.

[[FIGURE 195.]] Schematic section across a deep-water channel-levee complex based on outcrops from the Cerro Toro Formation, Upper Cretaceous, southern Chile (from Beaubouef, 2004). The lower section shows a series of idealized gamma ray logs. Reprinted with permission from the AAPG.

[[File:M91FG195.JPG|thumb|300px|{{FIGURE number|3}}Schematic section across a deep-water channel-levee complex based on outcrops from the Cerro Toro Formation, Upper Cretaceous, southern Chile (from Beaubouef, 2004). The lower section shows a series of idealized gamma ray logs. Reprinted with permission from the AAPG.]]

Injection wells located in overbank splays have poor communication with wells in the channel fill of the East Ford field in Texas (Dutton et al., 2003). The levee deposits can be a production target in their own right. In the Ram-Powell field in the Gulf of Mexico, production data indicate that levee deposits, although thin bedded, can show reservoir connectivity over a large area and give impressive production rates (Shew et al., 1995; Weimer and Slatt, 2004).

Injection wells located in overbank splays have poor communication with wells in the channel fill of the East Ford field in Texas (Dutton et al., 2003). The levee deposits can be a production target in their own right. In the Ram-Powell field in the Gulf of Mexico, production data indicate that levee deposits, although thin bedded, can show reservoir connectivity over a large area and give impressive production rates (Shew et al., 1995; Weimer and Slatt, 2004).