Reservoir-Scale
Depositional Facies, Trends, and Controls on Sandstone Distribution of the
Lower Atoka Group (“
Hentz, Tucker F.1, Eric C.
Potter1, Muyiwa A. Adedeji2 (1) Jackson School of
Geosciences, The University of Texas at Austin, Austin, TX (2) Jackson School
of Geosciences, The University of Texas at Austin, Austin,
Study of the largely siliciclastic lower
Atoka Group established detailed reservoir-facies distribution of four
chronostratigraphic units in a 349-mi2 area comprising all of Wise and adjacent
easternmost Jack Counties (Boonsville field). Net-sandstone maps (~1-mi well
spacing) representing the basal, medial, and upper parts of the lower Atoka,
supplemented by core descriptions, reveal that (1) the unit comprises
depositional facies that are far more heterogeneous than previously described,
(2) syndepositional regional faulting was a significant control on sandstone
distribution, and (3) primary source areas and related principal sediment-transport
pathways vary systematically with age within the lower Atoka. These elements
form a predictive model for locating primary sandstone fairways and for
generally assessing the unit's additional infill and stepout potential. Such an
effort is timely because of the aggressive development of the deeper Barnett
Shale play in most of the
The lower Atoka records the initial phase
of major post-Mississippian siliciclastic influx into the
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California