Jurassic sequence stratigraphy in the Mississippi interior salt basin of Alabama

Conference · Sat Sep 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5967855

Mancini, E A ^[1]; Tew, B H; Mink, R M ^[2]

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1. Geological Survey of Alabama, Tuscaloosa (USA) Univ. of Alabama, Tuscaloosa (USA)
2. Geological Survey of Alabama, Tuscaloosa (USA)

Three depositional sequences associated with cycles of eustatic sea-level change and coastal onlap can be identified in the Mississippi Interior Salt basin of Alabama. In the Mississippi Interior Salt basin, the lower depositional sequence is bounded by a basal unconformity and an upper Type 2 unconformity in the Callovian. This sequence includes Louann evaporites, Pine Hill anhydrites and shales, and Norphlet eolian sandstones. The middle depositional sequence reflects relative sea-level rise in the late Callovian. This sequence includes Norphlet marine sandstones and lower Smackover packstones and mudstones, middle Smackover mudstones and upper Smackover grainstones and anhydrites. The sequence has an upper Type 2 unconformity indicating relative sea-level fall in the Oxfordian. The upper depositional sequence reflects relative sea-level rise in the late Oxfordian. This sequence includes lower Haynesville evaporites and clastics (transgressive deposits), middle Haynesville carbonate mudstones and shales (condensed section), and upper Haynesville updip continental sandstones and downdip shales, limestones, and anhydrites (progradational highstand regressive deposits). The sequence has an upper Type 1 unconformity indicating abrupt sea-level fall in the late Kimmeridgian. In these depositional sequences, progradational highstand regressive deposits are the principal petroleum reservoirs. Condensed section deposits have the potential to be source rocks if subjected to proper burial conditions; however, only the lower and middle Smackover mudstones were deposited and buried under conditions favorable for hydrocarbon generation and preservation. An understanding of sequence stratigraphy can serve as an aid to identifying potential hydrocarbon exploration targets.

• OSTI ID: 5967855
• Report Number(s): CONF-9010204--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ALABAMA
DEPOSITION
ENERGY SOURCES
EVAPORITES
EXPLORATION
FEDERAL REGION IV
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
JURASSIC PERIOD
MESOZOIC ERA
MINERAL RESOURCES
MISSISSIPPI
NORTH AMERICA
PETROLEUM
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
ROCKS
SALT DEPOSITS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
SOURCE ROCKS
STRATIGRAPHY
USA