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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Barnett Shale—Unfolded: Sedimentology, Sequence Stratigraphy, and Regional Mapping
Prerna Singh1, Roger Slatt1, and William Coffey2
1School of Geology and Geophysics, University of Oklahoma, 100 E. Boyd St., Ste. 810, Norman, Oklahoma 73019
2Devon Energy Corporation, 20 N. Broadway Ave., Oklahoma City, Oklahoma 73102
ABSTRACT
Integrated study of several long continuous cores and wireline logs led to
defining
nine distinctive lithofacies on the basis of their physical, chemical, and
biological characters:
(1) siliceous non-calcareous mudstone, (2) siliceous calcareous mudstone, (3)
micritic/
limy mudstone, (4) bottom current calcareous laminae deposit, (5) fossiliferous
deposit,
(6) silty-shaly (wavy) interbedded deposit, (7) phosphatic
deposit, (8) dolomitic
mudstone, and (9) concretions. These nine lithofacies record considerable variation
in
depositional environments and processes through time, from quiet water deposition
of
low-energy, muddy facies, to high-energy,
phosphatic
, shelly lags and wavy-bedded
mudstones.
The cyclical stratal stacking style of lithofacies and corresponding gamma ray patterns has led to identification of high-resolution depositional parasequences within the Barnett Shale. Each parasequence is approximately 30 ft (9 m) thick, laterally continuous, and mappable. Maps of these parasequences exhibit varying trends of thinning directions through time.
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