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5/12/2018 Day 4 M14 Log Upscaling 2008 - slidepdf.com
Upscaling of Well LogsAveraging Methods for Continuous Logs
Arithmetic mean - Typically used for properties such as porosity, saturation and
net/gross because these are additive variables.
Harmonic mean - Gives the effective vertical permeability if the reservoir is layered
with constant permeability in each layer. It works well with log normal distributions. It is
used for permeability because it is sensitive to lower values.
Geometric mean - Normally a good estimate for permeability if it has no spatialcorrelation and is log normally distributed. It is sensitive to lower values.
RMS (Root Mean Squared) - Will provide a strong bias towards high values.
Minimum/ Maximum - Samples the min/max value of the well log for the cell.
Mid Point Pick ² Will pick the log value where the well is halfway through the
cell. Essentially a random choice and is therefore more likely to give a property with the
same distribution of values as the original well log data.
Random Pick ² Picks a log point at random from anywhere within the cell. This random option avoids
the smoothing tendency of other methods and is therefore more likely to give a property with the same
distribution of values as the original well log data.
Generally:
RMS > Arithmetic
Arithmetic > Geometric
Geometric > Harmonic
5/12/2018 Day 4 M14 Log Upscaling 2008 - slidepdf.com