Statistically-based Lithofacies Predictions for 3-D Reservoir Modeling:An
Example from the Panoma (Council Grove) Field,Hugoton Embayment,Southwest
Kansas Geological Survey
Open-file Report 2003-30
Log Response and Lithofacies
The eight lithofacies can be discriminated effectively by four wireline
log properties. Although the log distributions of the separate lithofacies
show overlaps in their ranges, their collective use within multivariate
statistical analysis results in good predictions of lithofacies identity
as decisions rooted in probability.
Gamma-ray log contrasts the generally
low radioactivity within the carbonates to higher levels emitted from
clay minerals and silt fractions.
Photoelectric effect is a direct function
of the lithofacies aggregate atomic number and can be related to mineral
Resistivity log is sensitive to both
pore volume and pore fluid content in the carbonates as well as conductivity
caused by clay mineral cation-exchange properties in the shaly lithofacies.
Delta Phi transform (neutron minus density
porosity) is highly correlated with the grain density of the lithofacies
and is another useful and independent indicator of mineralogy.
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Last updated May 2003