Characterization
of Seismically Imaged Pennsylvanian Ooid Shoal Geometries and Comparison with
the Modern*
By
W. Lynn Watney1, Evan K. Franseen1, Alan P. Byrnes1, Richard D. Miller1, Abdelmoneam Raef1, Stacy L. Reeder2, and Eugene C. Rankey2
Search and Discovery Article #20038 (2006)
Posted September 17, 2006
*Oral presentation at AAPG Annual Convention, Houston, Texas, April 9-12, 2006
Click to view presentation in PDF format (~2.8 mb).
1The University of Kansas, Lawrence, KS ([email protected])
2Rosenstiel School of Marine and Atmospheric Science, Miami, FL
Abstract
A 4-D-seismic
study (Hall-Gurney Field, Kansas) is focusing on imaging and monitoring
injected
carbon dioxide movement within a thin (~4 m) heterogeneous Pennsylvanian
Plattsburg Limestone. The
reservoir
consists of a 16 km x 3 km ooid shoal
complex that encompasses two to three stacked, shallowing-upward cycles. Based
on well logs, the succession forms 1.6 to 3.2 km2 lobes of locally
porous carbonate mantling a broad paleotopographic high. Although seismic
similarity facies maps are averaged over the entire thickness of stacked oolitic
deposits, the images appear to show sinuous to linear, isolated pods and
apparent parabolic forms within the 1.2 km2 seismic image, which are
similar to geometries of individual oolitic shoal complexes in the Modern.
Variations in the oomoldic pore system and geometries of beds within the oolite
bodies appear to be associated with amplitude patterns. Curvature attribute
seismic maps also suggest structural lineaments that may have influenced the
location of depositional and diagenetic lithofacies. Core, wireline log, and CO2
flood data incorporated into a refined geomodel are verifying the seismic
results. Our ability to image facies and geometric aspects of ancient subsurface
ooid complexes at a scale comparable to Modern ooid complexes provides the
opportunity to develop quantitative algorithms to define and predict geomorphic,
granulometric, and petrophysical properties combining Modern and ancient oolitic
systems. Our long term goal is to evaluate and quantify the nature of variables
that control similarities and differences between oolitic depositional systems
to construct object-based 3-D models that can be used to populate
reservoir
models.
Selected Figures
References
Dubois, Martin K., Alan P. Byrnes, and W. Lynn Watney, 2003,
Field development and renewed reservoir
characterization
for CO2 flooding of the
Hall-Gurney Field, Central Kansas: Kansas
Geological Survey Open-file Report 2001-38.
Rankey, G., and S. Reeder, 2005, Processes and patterns in ooid
shoals, Abaco Island Chain, Bahamas: Implications for reservoir
characterization
and prediction: CSL Field Trip Guidebook, Sept-Oct. - 2005, 79 p.