Foraminiferal biostratigraphy and paleoecology of Wilcox group (Paleocene-Eocene), central Louisiana

Conference · Thu May 01 04:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5062814

Nunn, L L

The Wilcox Group in east-central and south-central Louisiana consists of 300-1200 m of mostly clastic marine and nonmarine deposits. Detailed micropaleontologic studies of the Wilcox Group in Louisiana are not available because the strata are generally unfossiliferous, especially in the northern, updip part of the study area. However, the present foraminiferal study, done in conjunction with a comprehensive regional investigation, has yielded significant biostratigraphic and paleoenvironmental information. Well cuttings and conventional cores from wells drilled by various oil companies into Wilcox units in Allen, Avoyelles, St. Landry, St. Martin, and Pointe Coupee parishes contain planktonic foraminifera that permit their assignment to established regional and worldwide zonation schemes. The section ranges from the Paleocene to the Eocene, and includes the Globorotalia angulata, G. pusilla, G. pseudomenardii, G. velascoensis, and G. subbotinae zones. Samples from conventional cores drilled through the Wilcox section throughout the study area yield benthic foraminiferal faunas that are dominated by agglutinated species and represent marine environments that range from the inner continental shelf to the continental slope. Core samples of glauconitic sandstones from the uppermost part of the section contain faunas that are dominated by Discocyclina sp. and other species of calcareous larger foraminifera. These faunas indicate shallow-water continental-shelf paleoenvironments. Many of the producing reservoir sandstones in the downdip part of the study area are stratigraphic traps of a marine depositional origin. This foraminiferal study, in conjunction with the ongoing regional Wilcox synthesis, will yield insight to similar producing trends in the downdip parts of the upper Wilcox.

• Research Organization: Basin Research Institute and Louisiana Geological Survey, Baton Rouge
• OSTI ID: 5062814
• Report Number(s): CONF-860624-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CENOZOIC ERA
DEPOSITION
FEDERAL REGION VI
FOSSILS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC TRAPS
GEOLOGY
LOUISIANA
MINERAL RESOURCES
NORTH AMERICA
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
STRATIGRAPHY
TERTIARY PERIOD
USA