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Title: Phosphoria reservoir facies exposed in the northeast Bighorn basin - an exhumed Cottonwood Creek oil field

Abstract

Detailed stratigraphic correlations between well-exposed outcrops and nearby oil wells permit the delineation of porous carbonate reservoir facies within the Phosphoria Formation (Guadalupian) in the northeastern part of the Bighorn basin. The most significant petroleum reservoirs in this area occur in two depositional facies defined by faunas and vertical sequences of sedimentary and biogenic structures. Effective porosity development in the peritidal facies occurs in intraclast-pellet, dolomite packstone/grainstone, and irregularly laminated, fenestral algal-boundstone. In the restricted-marine facies, reservoir development occurred in bioturbated, dolomite mudstone-wackestone, and phylloid-algal and mollusk dolomite wackestone-packstone. Based on regional analysis, fenestral algal-boundstone pods are thought to have evolved as peninsula-island complexes paralleling reactivated northwest-southeast-trending faults on the east side of the Bighorn basin. In the northeastern Bighorn basin, peninsula-island complexes accumulated on the Bighorn and Sheep Mountain paleohighs. They defined an embayment in which restricted marine rocks were deposited. Porous peritidal rocks appear to have been concentrated along the seaward flanks of the thickest algal-boundstone pods, which grade laterally into porous restricted-marine lithologies. The geologic setting of exposed peritidal and restricted-marine reservoirs in the northeastern Bighorn basin appears to be similar to that of Cottonwood Creek field. An understanding of facies relationships may be useful in themore » further development of Cottonwood Creek field and for exploration for similar types of carbonate stratigraphic traps along the eastern margin of the Bighorn basin.« less

Authors:
; ;
Publication Date:
Research Org.:
RPI Colorado, Inc., Boulder
OSTI Identifier:
7053815
Report Number(s):
CONF-8609129-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 70:8; Conference: AAPG Rocky Mountain Section meeting, Casper, WY, USA, 7 Sep 1986
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; OIL FIELDS; RESERVOIR ROCK; WYOMING; CARBONATE ROCKS; DEPOSITION; EXPLORATION; GEOLOGIC FORMATIONS; SEDIMENTARY BASINS; STRATIGRAPHY; FEDERAL REGION VIII; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; MINERAL RESOURCES; NORTH AMERICA; PETROLEUM DEPOSITS; RESOURCES; ROCKS; SEDIMENTARY ROCKS; USA; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Sturm, S D, Inden, R F, and Dean, J S. Phosphoria reservoir facies exposed in the northeast Bighorn basin - an exhumed Cottonwood Creek oil field. United States: N. p., 1986. Web.
Sturm, S D, Inden, R F, & Dean, J S. Phosphoria reservoir facies exposed in the northeast Bighorn basin - an exhumed Cottonwood Creek oil field. United States.
Sturm, S D, Inden, R F, and Dean, J S. 1986. "Phosphoria reservoir facies exposed in the northeast Bighorn basin - an exhumed Cottonwood Creek oil field". United States.
@article{osti_7053815,
title = {Phosphoria reservoir facies exposed in the northeast Bighorn basin - an exhumed Cottonwood Creek oil field},
author = {Sturm, S D and Inden, R F and Dean, J S},
abstractNote = {Detailed stratigraphic correlations between well-exposed outcrops and nearby oil wells permit the delineation of porous carbonate reservoir facies within the Phosphoria Formation (Guadalupian) in the northeastern part of the Bighorn basin. The most significant petroleum reservoirs in this area occur in two depositional facies defined by faunas and vertical sequences of sedimentary and biogenic structures. Effective porosity development in the peritidal facies occurs in intraclast-pellet, dolomite packstone/grainstone, and irregularly laminated, fenestral algal-boundstone. In the restricted-marine facies, reservoir development occurred in bioturbated, dolomite mudstone-wackestone, and phylloid-algal and mollusk dolomite wackestone-packstone. Based on regional analysis, fenestral algal-boundstone pods are thought to have evolved as peninsula-island complexes paralleling reactivated northwest-southeast-trending faults on the east side of the Bighorn basin. In the northeastern Bighorn basin, peninsula-island complexes accumulated on the Bighorn and Sheep Mountain paleohighs. They defined an embayment in which restricted marine rocks were deposited. Porous peritidal rocks appear to have been concentrated along the seaward flanks of the thickest algal-boundstone pods, which grade laterally into porous restricted-marine lithologies. The geologic setting of exposed peritidal and restricted-marine reservoirs in the northeastern Bighorn basin appears to be similar to that of Cottonwood Creek field. An understanding of facies relationships may be useful in the further development of Cottonwood Creek field and for exploration for similar types of carbonate stratigraphic traps along the eastern margin of the Bighorn basin.},
doi = {},
url = {https://www.osti.gov/biblio/7053815}, journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 70:8,
place = {United States},
year = {1986},
month = {8}
}

Conference:
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