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Deepwater Jackfork Field Course (Arkansas – Oklahoma)
Lesli J. Wood, PhD
INSTRUCTOR: Lesli J. Wood, PhD
DISCIPLINE: Field Courses
COURSE LENGTH (DAYS): 3 Days (Available in 5-Day Format Upon Request)
CEUS: 2.4
AVAILABILITY: Public & In-House 
WHO SHOULD ATTEND: Exploration and development geologists, engineers, geophysicists and managers desiring
hands-on experience in recognition of deepwater reservoirs, and who want to learn
frameworks and methodologies for exploring for, and managing these reservoirs in the
subsurface, as well as modelers who want to compare and contrast different architectures
in different types of deepwater basins.

COURSE DESCRIPTION: This field course examines the various submarine gravity deposits (deepwater
valleys/canyons, channels, channelized and non-channelized lobes, mass failures,
injectites, etc.) in an up-dip to down-dip depositional profile of Jackfork Group
(Pennsylvanian) strata across the Morrowan Ouachita Basin of Arkansas. The five-day trip
visits outcrops of submarine slope canyon fill, submarine slope and basin channel fill, basin
floor sheet sandstones and rare leveed-channel complexes. Outcrops are seen in
remarkable dam and quarry exposures. In one area, a 3-D geologic model has been
completed and this outcrop has undergone reservoir simulation using the Eclipse™
modeling software. At each outcrop, measured stratigraphic sections, outcrop gamma ray
logs and (in some cases) ground-penetrating radar examples are provided, which tie
outcrop observations to analog subsurface reservoir features. Unique depositional features
and inferred processes are discussed. The Jackfork Group is widely considered to be an
outcrop analog to many deepwater (turbidite) reservoirs worldwide. We will show some
direct scaling to the Wilcox of the Gulf of Mexico.


  • Examination and discussion of various rock types of Pennsylvanian Jackfork Group
  • Up-dip canyon fill, Big Rock Quarry, Arkansas
  • Slope channel-fill, Pinnacle Mountain State Park, Arkansas
  • Sheet- and channel-fill sandstones and leveed channel facies in various outcrops and quarries, DeGray Lake State
  • Park/Hollywood area, Arkansas 3-D geologic model for simulation
  • Channel-fill sandstones, Murfreesboro, Arkansas
  • Sheet and channel-fill sandstones, eastern Oklahoma as related to the Jackfork gas play
  • Origin of anomalous porous and permeable zones