Integrated reservoir characterization of mature oil reservoirs: An example from Oligocene Frio fluvial/deltaic sandstones, Rincon Field, south Texas
Journal Article
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· AAPG Bulletin
OSTI ID:96246
- Univ. of Texas, Austin, TX (United States)
The Frio fluvial/deltaic sandstone along the Vicksburg fault zone play of south Texas has produced nearly 1 billion bbl of oil from fluvial/deltaic sandstones since field development began in the 1940s. More than half of the reservoirs in this depositionally complex play have been abandoned, even though large volumes of oil remain. Current efforts integrating geological and engineering reservoir characterization are being used to identify the location of unrecovered mobile oil, estimated at more than 1 billion bbl, that remains in unproduced reservoir zones in fields within this very mature play. Engineering data from Frio reservoirs in Rincon field were used to assess past production behavior, determine completion density, and prioritize zones for incremental reserve growth opportunities. Geologic data have been evaluated to identify interwell stratigraphic heterogeneity and potential for compartmentalization of significant volumes of unrecovered oil. Major oil reservoirs represent deposition in broad, dip-elongate fluvial systems. Individual zones consist of multiple thin (0-40 ft) sandstone units that stack to form gross thicknesses of 50 to 100 ft. They occur both as narrow channel fills isolated vertically and laterally by very low-permeability overbank facies and flood-plain mudstones and as large channel complexes with multiple laterally coalescing sand lobes. Large dip-elongate channel-sandstone complexes provide ideal conditions for the isolation of oil accumulations in multiple reservoir compartments, many of which are now incompletely drained or completely untapped. Reservoir architectural mapping and core analysis data from more than 100 wells are being combined with reserve volumetrics to describe heterogeneity and to identify possible locations of additional reserves within a 100-ft reservoir interval that has already produced more than 15 million bbl of oil.
- OSTI ID:
- 96246
- Report Number(s):
- CONF-941065--
- Journal Information:
- AAPG Bulletin, Journal Name: AAPG Bulletin Journal Issue: 9 Vol. 78; ISSN 0149-1423; ISSN AABUD2
- Country of Publication:
- United States
- Language:
- English
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