Print this pageAbstract: High-resolution
porosity modeling integrating core, log and 3-D 
seismic
data in Jurassic
grain shoals, Gulf of Mexico, U.S.A.
PORTER, M. L., C. S. CALVERT, S. J. HELWICK, R. S. HUBBARD, V. KHARE, E. J. OSWALD, L. A. WAHRMUND
A integrated study
of cores, logs and 3-D seismic attributes developed a fine-scale, high-resolution
reservoir model of Jurassic grain shoals in the Gulf of Mexico. A new seismic
attribute analysis technique resulted in a optimal prediction of vertical
porosity information over the reservoir interval. These seismic attributes
were calibrated to porosity values derived from log and core data in a
3-D calibration model. Geostatistical techniques integrated this calibration
model with well data to build the final high-resolution porosity model
of the grain shoals.
Previous studies and successful
drilling results had relied heavily on seismic amplitude values at the
top of the reservoir as an indicator of porosity. Thus development drilling
was targeted at areas of porosity development in the upper portion of the
reservoir. Our seismic attribute analysis technique preserved inherent
porosity variations over the entire thickness of the reservoir. As a result,
this study identified significant, previously unrecognized porosity development
in the lower third of the reservoir. This overlooked porosity is contained
within older carbonate grain shoals not imaged on conventional seismic
attribute
maps or targeted in field development plans.
AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria