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Abstract
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Heterogeneity
of Fluvial-Deltaic Reservoirs in the Appalachian Basin: A Case Study from
a Lower Mississippian Oil Field in Central West Virginia1 Michael Ed. Hohn, Ronald R.
McDowell, David L. Matchen, and Ana G. Vargo3 |
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ABSTRACT Since discovery in 1924, Granny Creek field
in central West Virginia has experienced several periods of renewed drilling
for oil in a fluvial-deltaic sandstone in the Lower Mississippian Price
Formation. Depositional and diagenetic features leading to reservoir heterogeneity
include highly variable grain size, thin shale and siltstone beds, and
zones containing large quantities of calcite, siderite, or quartz cement.
Electrofacies defined through cluster analysis
of wireline log responses corresponded approximately to facies observed
in core. Three-dimensional models of porosity computed from density logs
showed that zones of relatively high porosity were discontinuous across
the field. The regression of core permeability on core porosity is statistically
significant, and differs for each electrofacies. Zones of high permeability
estimated from porosity and electrofacies tend to be discontinuous and
aligned roughly north-south.
Cumulative oil production varies considerably
between adjacent wells, and corresponds very poorly with trends in porosity
and permeability. Original oil in place, estimated for each well from reservoir
thickness, porosity, water saturation, and an assumed value for drainage
radius, is highly variable in the southern part of the field, which is
characterized by relatively complex interfingering of electrofacies and
similar variability in porosity and permeability. |
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