Print this pageAbstract: Sandstone Diagenesis and Reservoir Characteristics of the Eocene Tyee basin, Southern Oregon Coast Range: Viewed from Sequence Stratigraphic Framework
RYU, IN-CHANG, Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, South Korea; ALAN R. NIEM, Department of Geosciences, Oregon State University, Corvallis, Oregon 97331-5506. U.S.A.
Summary
Sandstone petrographic and diagenetic analysis within a sequence
stratigraphic framework provides a better understanding of the
reservoir characteristics in the Eocene Tyee basin, southern Oregon
Coast Range. Much primary porosity has been filled with zeolite
(heulandite and laumontite), clay (smectite and corrensite), and
quartz cement and pseudomatrix, thus diminishing the permeability
of potential reservoir rocks. Reservoir-quality porosities and
permeabilities, however, are present locally in some highstand
delta front sandstone facies in the southern part of the basin as
well as secondary dissolution porosity in lowstand turbidite
sandstones in the deeper part of the basin to the north. This
complex burial diagenesis is due to variations in pore 
fluid
composition
in time and space, which is attributed to variations in
original detrital mineralogy and regional geothermal gradient in
the basin.
AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah