Composition of seismically identified satellite mounds surrounding Greater Aneth field, southeast Utah

Conference · Sun Aug 01 04:00:00 EDT 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7056271

Eby, D E ^[1]; Groen, W G; Johnson, J F ^[2]

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1. Eby Petrography Consulting, Inc., Englewood, CO (United States)
2. Chuska Energy Co., Denver, CO (United States)

Five different types of satellite mounds have been encountered during drilling and extensive coring of approximately 40 high-resolution CDP (common depth point) seismic anomalies in the Desert Creek interval of the Pennsylvanian (Desmoinesian) Paradox Formation around the periphery of Greater Aneth field. The composition and diagenetic modification of these mound types directly affect the quality of porosity and permeability within each satellite buildup. The mound types and their principal characteristics are (1) crinoid-sponge limestone with wackestone to packstone fabrics; (2) coralline algal boundstones that are slightly dolomitized; (3) bryozoan-dominated lime boundstones with no significant dissolution porosity; (4) phylloid algal bafflestones with extensive dissolution and some dolomitization occasionally overlain by dolomitized stromatolitic/thrombolitic boundstones; and (5) stacked bioclastic grainstones with extensive dissolution and complete dolomitization. Controls on the development of each mound type appear to be a function of water depth and prevailing water energy. Mound types 1 and 2 typically have low porosity, whereas type 3 preserved primary porosity. Types 4 and 5 commonly exhibit extensive porosity and permeability modification through freshwater dissolution and early dolomitization. Up to five cycles of buildup growth can occur within the Desert Creek satellite mounds. Mound composition types will recur or change to another growth type depending upon local water depth and energy conditions. Calibration of seismic amplitude variations can be used in imaging reservoir size and porosity variation.

• OSTI ID: 7056271
• Report Number(s): CONF-930947--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:8
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
CARBONATE ROCKS
DEVELOPED COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC SURVEYS
GEOPHYSICAL SURVEYS
LIMESTONE
MINERAL RESOURCES
NORTH AMERICA
OIL FIELDS
PERMEABILITY
PETROLEUM DEPOSITS
POROSITY
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
SURVEYS
USA
UTAH