3D Seismic
Attribute Analysis of the Jurassic Entrada/Curtis
Sandstone Play,
O'Neal, Ryan J.1, R. William
Keach2, Thomas H. Morris1, John H. McBride1
(1) Brigham Young University, Provo, UT (2) Landmark and Brigham Young
University, Provo, UT
Erg-margin sandstones have been
recognized as potential stratigraphic and combination
traps especially when they are laterally associated with muddy
marine-influenced facies. Gas productive reservoirs
of this type have recently been discovered within the Middle Jurassic Entrada/Curtis Sandstones of the Uinta basin,
3D seismic attribute
analysis, attribute quantification, and cross sectional views of the 3D survey
have been useful in delineating reservoir quality dune complexes which serve as
primary gas reservoirs in the Entrada/Curtis-Moab
interval. Cross sectional views and four seismic attributes including
amplitude, spectral decomposition, semblance and phase were analyzed from the
3D data set. Cross sectional views displaying toplap
features, which likely indicate an unconformity between Entrada
clinoforms below and Curtis planer beds above, may
aid the explorationist in discovering this important
seismic interval. Amplitude extraction maps have been created and are useful in
indicating the geometry of dune complexes. Spectral decomposition maps are
useful in delineating lateral changes in the thickness of dune complexes. In
combination, these two seismic attributes were found to be very useful in high
grading exploration targets within the play and aiding the explorationist
in risk management.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California