Numerous analogous examples of IVFs in modern Quaternary environments can be identified to help understand the internal and external geometries of the sediment bodies. Notable among these are deposits found in Nigeria, the North Sea, New Zealand, Trinidad, the Bay of Fundy, the Gulf of Mexico, and the East Texas Coastal Plain. Multi-trace attribute technology is simply the use of more than a single trace line as input to seismic attribute defintion. IVF reservoirs are particularly amenable to detection because of the sharp lateral changes in lithology associated with their scour and fill origin. Fluvial facies in general have higher permeabilities and lower clay content than estuarine sediments, but they are highly heterogeneous, both laterally and vertically.
Fluvial deposits tend to be less calcareous and often exhibit fining-upward sequences.
In analyzing Morrow logs in IVF reservoirs, the Archie equation generally is applicable without serious complications. In only a few cases do anomalous water resistivities or the occurrence of pyrite or clays cause problems. Lessons Learned Poor waterflood recovery from a typical Morrow IVF reservoir at Stewart field in Finney Co., Kansas, was a function of unrecognized reservoir heterogeneity, channeling of injected water, and clogging of injection wells by solids in the injection water. Reservoir modeling and identification of appropriate recovery processes should follow, along with identification and correction of operational problems. The Stewart field went from 270 BOPD to 3150 BOPD by optimizing the waterflood using this approach.