Significance of botryoidal aragonite in early diagenetic history of phylloid algal mounds in Bug and Papoose Canyon fields, southeastern Utah and southwestern Colorado

Conference · Sun Apr 01 04:00:00 EST 1984 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6434493

Roylance, M H

Abundant altered botryoidal aragonite cement is recognized both in core slabs and thin sections from phylloid algal-mound facies in the Desert Creek interval of the Paradox Formation in the Papoose Canyon-Bug field area. This subsequently dolomitized cement occurs as individual to coalescing botryoids, which appear in cross section as rounded feather-edge fans composed of radiating crystals. Botryoids locally comprise up to 90% of any given section of core. The botryoids are similar in appearance to Holocene botryoidal aragonite cement. However, it is deduced that, unlike modern counterparts, these botryoids grew both on the sea floor as well as within open cavities within the mound framework. The diagenetic history of the mounds in the Papoose Canyon-Bug field area was initiated with precipitation of botryoidal aragonite cement penecontemporaneously with deposition of phylloid algal plates, creating rigid anastomosing frameworks containing abundant primary porosity. When compacted, these mounds were brecciated, thus opening up more porosity. Some of the porosity was subsequently infilled by internal sediment and calcite and gypsum cements. Finally, these mounds were extensively dolomitized, and some secondary porosity was created by leaching. The fundamental significance of botryoidal aragonite at Papoose Canyon and Bug fields is that it helped to create and preserve very porous and permeable phylloid algal mounds by contributing to the formation of a rigid framework containing primary porosity, and by cementing the mounds early so that they became brecciated upon compaction. The preserved pores were ultimately filled with oil.

• Research Organization: Marathon Oil Co., Casper, WY
• OSTI ID: 6434493
• Report Number(s): CONF-8405216-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALGAE
ALKALINE EARTH METAL COMPOUNDS
ARAGONITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
COLORADO
DIAGENESIS
FEDERAL REGION VIII
FOSSILS
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OIL FIELDS
ORIGIN
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PLANTS
RESOURCES
USA
UTAH