Skip to Main Content
Book Chapter

Unconformity-Related Porosity Development in the Quintuco Formation (Lower Cretaceous), Neuquén Basin, Argentina

By
Neil F. Hurley
Neil F. Hurley
Marathon Oil Company Littleton, Colorado, U.S.A.
Search for other works by this author on:
Haydn C. Tanner
Haydn C. Tanner
Marathon Oil Company London, U.K.
Search for other works by this author on:
Carlos Barcat
Carlos Barcat
Marathon Oil Company Buenos Aires, Argentina
Search for other works by this author on:
Published:
January 01, 1995

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 pack-stones 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 packs tones 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.

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Memoir

Unconformities and Porosity in Carbonate Strata

David A. Budd
David A. Budd
Search for other works by this author on:
Arthur H. Saller
Arthur H. Saller
Search for other works by this author on:
Paul M. Harris
Paul M. Harris
Search for other works by this author on:
American Association of Petroleum Geologists
Volume
63
ISBN electronic:
9781629810843
Publication date:
January 01, 1995

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal