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Abstract
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Chapter 8
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Unconformity-Related
 Porosity Development in the Quintuco Formation (Lower Cretaceous), Neuquén
Basin, ArgentinaNeil F. Hurley
Marathon Oil Company
Littleton, Colorado,
U.S.A.
Haydn C. Tanner
Marathon Oil Company
London, U.K.
Carlos Barcat
Marathon Oil Company
Buenos Aires, Argentina
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ABSTRACT
Porous dolomites are present below a distinctive
stratigraphic marker within the lower Quintuco Formation (Lower Cretaceous,
Berriasian-lower Valanginian) in the eastern Neuquén basin, Argentina.
Dolomitized packstones and wackestones with moldic and sucrosic porosity
provide the main reservoir facies in Rio Neuquén field and perhaps
other oil fields in the area.
Lower Quintuco carbonates are comprised
of: (1) oolitic grainstones, (2) burrowed, dolomitized oolite-skeletal-peloid
packstones/ wackestones, (3) dolomudstones and bedded anhydrites, and (4)
very fine-grained, superficially coated oolite grainstones. These sediments
are commonly packaged into shoaling- and coarsening-upward parasequences.
Reservoir-quality porosity and permeability
exist almost exclusively in burrowed, dolomitized packstones and wackestones.
These strata are interpreted as off-bar facies deposited on the landward
side of bar complexes, similar to modern facies analogs known in the Joulters
Cay area of the Bahamas. In the lower Quintuco Formation, dolomite preferentially
replaced carbonate mud. Below an inferred widespread paleo-exposure surface,
ooid-skeletal-peloid grains were then dissolved to leave an open pore network
with abundant moldic and intercrystalline porosity.
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