Meandering fluvial reservoirs
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| Oil Field Production Geology | |
| |
| Series | Memoirs |
|---|---|
| Part | The Production Geologist and the Reservoir |
| Chapter | Eolian reservoirs |
| Author | Mike Shepherd |
| Link | Web page |
| PDF file (requires access) | |
| Store | AAPG Store |
Fluvial reservoirs are difficult for the production geologist to understand, characterize, and model. One major problem involves trying to classify fluvial reservoirs in the subsurface. The system used in this book broadly categorizes fluvial systems into meandering and braided fluvial reservoirs. Although this is a classification used by many production geologists, not all experts are happy with this approach; some believe the classification to be too prescriptive. They consider that only limited inferences can be made from core and log data as to the overall geometry of a fluvial reservoir in the subsurface (e.g., Bridge[1]). Because of this, some geologists prefer to use a simple nongeneric description by classifying subsurface fluvial geometries as either sheets or ribbons.[2]
[[file:M91FG70.JPG|thumb|300px|Figure 1 A point bar cut into the underlying Ivan limestone as picked out by varying seismic amplitudes on a horizon display, late Pennsylvanian to Early Permian, Baylor County, Texas (from BurnettCite error: Closing </ref> missing for <ref> tag Rijks and Jauffred,[3] Noah et al.[4] Carter[5]).
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.
See also
- Eolian reservoirs
- Braided fluvial reservoirs
- Deltaic reservoirs
- Deep-water marine reservoirs
- Carbonate reservoirs
References
- ↑ Bridge, J. S., 2003, Rivers and flood plains: Forms, processes and sedimentary record: Oxford, Blackwell, 491 p.
- ↑ Friend, P. F., M. J. Slater, and R. C. Williams, 1979, Vertical and lateral building of river sandstone bodies, Ebro Basin, Spain: Journal of the Geological Society of London, v. 136, p. 39–46.
- ↑ Rijks, E. J. K., and J. C. E. M. Jauffred, 1991, Attribute extraction: An important application in any detailed 3D interpretation study: Leading Edge, v. 10, no. 9, p. 11–19.
- ↑ Noah, J. T., G. S. Hofland, and K. Lemke, 1992, Seismic interpretation of meander channel point-bar deposits using realistic seismic modeling techniques: The Leading Edge, v. 11, p. 13–18.
- ↑ Carter, D. C., 2003, 3-D seismic geomorphology: Insights into fluvial reservoir deposition and performance, Widuri field, Java Sea: AAPG Bulletin, v. 87, no. 6, p. 909–934.
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