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Meandering fluvial reservoirs (view source)
Revision as of 16:13, 31 July 2015
, 16:13, 31 July 2015no edit summary
Meander belt reservoirs show different production behavior characteristics from braided river reservoirs; in the absence of seismic geomorphology evidence, the production geologist should intuitively pick the fluvial geometry type most likely to fit the available data and the reservoir performance. Perhaps because of the uncertainty involved in determining the planform geometry in fluvial reservoirs, the scenario approach (see [[Reservoir uncertainty]]) may be an appropriate tool to help evaluate fluvial reservoirs.
Meander belt reservoirs show different production behavior characteristics from braided river reservoirs; in the absence of seismic geomorphology evidence, the production geologist should intuitively pick the fluvial geometry type most likely to fit the available data and the reservoir performance. Perhaps because of the uncertainty involved in determining the planform geometry in fluvial reservoirs, the scenario approach (see [[Reservoir uncertainty]]) may be an appropriate tool to help evaluate fluvial reservoirs.
[[file:M91FG173.JPG|thumb|300px|{{figure number|2}}Satellite photo of a fluvial meander belt, United States. Courtesy of the [http://www.earthasart.gsfc.nasa.gov NASA Web site]. The lower diagram shows the internal geometry of the present-day Mississippi meander belt (from Jordan and Pryor<ref name=Jordanandpryor_1992> Jordan, D. W., and W. A. Pryor, 1992, [http://archives.datapages.com/data/bulletns/1992-93/data/pg/0076/0010/0000/1601.htm Hierarchical levels of heterogeneity in a Mississippi river meander belt and application to reservoir systems]: AAPG Bulletin, v. 76, no. 10, p. 1601–1624.</ref>). Reprinted with permission from the AAPG.]]
[[file:M91FG174.JPG|thumb|300px|{{figure number|3}}Computer simulation of a meander belt geometry from Sun et al.<ref name=Sunetal_1996>Sun, T., P. Meakin, T. Jossang, and K. Schwarz, 1996, A simulation model of meandering rivers: Water Resources Research, v. 32, pt. 9, p. 2937–2954.</ref> The meander belt comprises a complex labyrinth of point bars and clay plugs. The meander belt width is on the scale of a few hundreds of meters. Reprinted with permission from, and © by, the American Geophysical Union.]]
==Geometry of meander belts==
Meandering rivers deposit sand and mud within well-defined meander belts. The appearance of a meander belt in plan and cross section is of a complex labyrinth of interlocking sand bodies on the scale of hundreds of meters, embedded within varying volumes of mud ([[:file:M91FG173.JPG|Figure 2]]). The mud can make up 50% or more of the volume. Channel features, where they survive, tend to be plugged with clay ([[:file:M91FG173.JPG|Figure 2]], [[:file:M91FG174.JPG|Figure 3]]).