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Title: Influence of basement islands and ridges on Smackover Deposition, southwest Alabama

Abstract

Pre-Jurassic basement highs, composed of igneous and/or metamorphic rocks, have influenced the deposition of Jurassic Smackover sediments in Clarke, Monroe, Conecuh, and Escambia Counties, Alabama. These basement islands and ridges provided a structural fabric on which Smackover sediments were deposited. The following 3 basic structural settings illustrate the thickness variations and lithofacies distribution of Smackover sediments on the flanks and crests of these basement highs. Emergent features were never covered by Smackover seas, resulting in nondeposition of Smackover sediments over their crests. Flanking these features are finely crystalline and anhydritic dolomites capped by bedded nodular-mosaic anhydrite. The anhydrite grades upward into Haynesville continental sediments that also overlie the crests of these features. Semi-emergent features were above sea level for most of Smackover deposition. It was not until near the end of Smackover transgression that these islands and ridges were inundated. As the seas regressed, shoaling occurred on the flanks of these features depositing predominantly grain-supported limestones that were later dolomitized. The crests of these basement highs are covered by thin, low porosity, grain- and mud-supported dolomites capped by bedded nodular-mosaic to distorted mosaic anhydrite. Nonemergent features were submerged through most of Smackover deposition. This enables carbonates to accumulate as thickmore » organic buildups and shoals over crestal portions of the basement highs. These thoroughly dolomitized and highly porous and permeable crestal sediments grade upward into nonporous, mud-supported dolomites capped by bedded nodular-mosaic anhydrite.« less

Authors:
Publication Date:
Research Org.:
Texaco, New Orleans, LA
OSTI Identifier:
6002778
Report Number(s):
CONF-850322-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 69:2; Conference: American Association of Petroleum Geologists annual meeting, New Orleans, LA, USA, 25 Mar 1985
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; ALABAMA; GEOLOGIC STRUCTURES; PETROLEUM DEPOSITS; GEOLOGY; GEOLOGIC FORMATIONS; GEOLOGIC HISTORY; JURASSIC PERIOD; RESERVOIR ROCK; FEDERAL REGION IV; GEOLOGIC AGES; GEOLOGIC DEPOSITS; MESOZOIC ERA; MINERAL RESOURCES; NORTH AMERICA; RESOURCES; USA; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Greene, A L. Influence of basement islands and ridges on Smackover Deposition, southwest Alabama. United States: N. p., 1985. Web.
Greene, A L. Influence of basement islands and ridges on Smackover Deposition, southwest Alabama. United States.
Greene, A L. 1985. "Influence of basement islands and ridges on Smackover Deposition, southwest Alabama". United States.
@article{osti_6002778,
title = {Influence of basement islands and ridges on Smackover Deposition, southwest Alabama},
author = {Greene, A L},
abstractNote = {Pre-Jurassic basement highs, composed of igneous and/or metamorphic rocks, have influenced the deposition of Jurassic Smackover sediments in Clarke, Monroe, Conecuh, and Escambia Counties, Alabama. These basement islands and ridges provided a structural fabric on which Smackover sediments were deposited. The following 3 basic structural settings illustrate the thickness variations and lithofacies distribution of Smackover sediments on the flanks and crests of these basement highs. Emergent features were never covered by Smackover seas, resulting in nondeposition of Smackover sediments over their crests. Flanking these features are finely crystalline and anhydritic dolomites capped by bedded nodular-mosaic anhydrite. The anhydrite grades upward into Haynesville continental sediments that also overlie the crests of these features. Semi-emergent features were above sea level for most of Smackover deposition. It was not until near the end of Smackover transgression that these islands and ridges were inundated. As the seas regressed, shoaling occurred on the flanks of these features depositing predominantly grain-supported limestones that were later dolomitized. The crests of these basement highs are covered by thin, low porosity, grain- and mud-supported dolomites capped by bedded nodular-mosaic to distorted mosaic anhydrite. Nonemergent features were submerged through most of Smackover deposition. This enables carbonates to accumulate as thick organic buildups and shoals over crestal portions of the basement highs. These thoroughly dolomitized and highly porous and permeable crestal sediments grade upward into nonporous, mud-supported dolomites capped by bedded nodular-mosaic anhydrite.},
doi = {},
url = {https://www.osti.gov/biblio/6002778}, journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 69:2,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 1985},
month = {Fri Feb 01 00:00:00 EST 1985}
}

Conference:
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