Petrographic, stratigraphic, and structural study of the Smackover gray sand (Jurassic) in north Louisiana

Conference · Tue Jan 01 04:00:00 EST 1980 · Trans., Gulf Coast Assoc. Geol. Soc.; (United States)

OSTI ID:6161748

Miciotto, S A

The gas-producing gray sand, a dark gray to black, very fine-grained sand, occurs as 3 sand tongues in the lower member of the Smackover Formation in the subsurface of Bossier, Webster, Claiborne, and Lincoln parishes, Louisiana. A Flaser-bedded silty shale facies indicates deposition on a mid-tidal flat environment. Smackover deposition during the Jurassic in the study area was located on the gently dipping slope between a broad coastal shelf to the north and a basin to the south. The gray sand was deposited over the Norphlet formation and Louann salt before flowage and swelling of the Louann salt began. Uplift and swelling of the Louann salt later in the Jurassic created growing anticlines; sediment slumped off the structural highs of the growing salt anticlines into basinal muds and silts. The Smackover gray sand continues to challenge exploration geologists because of the lateral pinch out of its sand tongues. 11 references.

• OSTI ID: 6161748
• Conference Information: Journal Name: Trans., Gulf Coast Assoc. Geol. Soc.; (United States) Journal Volume: 30
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
JURASSIC PERIOD
LOUISIANA
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NORTH AMERICA
RESOURCES
ROCKS
SALT DEPOSITS
SAND
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
USA