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GEOREF RECORD

Depositional systems of a tight gas-productive barrier-strandplain sequence; Corcoran and Cozzette sandstones, Northwest Colorado

Robert J. Finley and Lewis R. Ladwig
Depositional systems of a tight gas-productive barrier-strandplain sequence; Corcoran and Cozzette sandstones, Northwest Colorado (in AAPG annual convention with divisions SEPM/EMD/DPA, Anonymous)
AAPG Bulletin (February 1985) 69 (2): 255

Abstract

The Corcoran and Cozzette sandstones (Campanian) are members of the Price River Formation within the Mesaverde Group of the Piceance Creek basin, and consist of marginal-marine facies between the underlying Mancos Shale and the overlying continental Mesaverde. Loginterpreted facies within the Corcoran-Cozzette vary from shale with thin siltstone to sandstone interbeds (shelf to lower shoreface), through upward-coarsening sequences (upper shoreface to foreshore), to interbedded thin coal, sandstone, and shale (alluvial plain to bay or lagoon). Plateau and Shire Gulch are the largest fields that produce gas from lowpermeability (0.002-0.08 md), fine-grained to very fine grained sandstone of the Corcoran and Cozzette (over 8.4 bcf produced through 1982). Within these fields, 7 distinct northeast-trending strandplain and barrier units have been identified. Strandplain sandstones form the lower half to two-thirds of each member, and barrier sandstones form the upper depositional units. Net sandstone thickness of the strandplain units increases from less than 20 ft southeast of the fields to more than 80 ft within Plateau field. Along the southeastern Plateau field margin, upper units in each member contain 30-55 ft thick sandstones that repeat the shoreface sequence. Most completions are in the lower (39%) and upper (33%) Corcoran, whereas the lower and upper Cozzette each account for 14% of perforated intervals. The underlying Mancos Shale and overlying coal may account for the greater gas production of the Corcoran. Gas productivity of individual depositional units cannot be defined due to commingled production from multiple intervals in most wells.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 69
Serial Issue: 2
Title: Depositional systems of a tight gas-productive barrier-strandplain sequence; Corcoran and Cozzette sandstones, Northwest Colorado
Title: AAPG annual convention with divisions SEPM/EMD/DPA
Author(s): Finley, Robert J.Ladwig, Lewis R.
Author(s): Anonymous
Affiliation: Univ. Tex. at Austin, Bur. Econ. Geol., Austin, TX, United States
Pages: 255
Published: 198502
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG annual convention with divisions SEPM/EMD/DPA
Meeting location: New Orleans, LA, USA, United States
Meeting date: 19850324Mar. 24-27, 1985
Summary: Y
Accession Number: 1986-033365
Categories: Economic geology, geology of energy sources
Document Type: Serial Conference document
Bibliographic Level: Analytic
N37°00'00" - N41°00'00", W109°00'00" - W102°00'00"
Secondary Affiliation: Colo. Geol. Surv., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1986
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