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Dykstra-Parsons coefficient of permeability variation

by Ruben Charles last modified Jun 08, 2008 10:18 PM
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Dykstra-Parsons coefficient of permeability variation is a common descriptor of reservoir heterogeneity. It measures reservoir uniformity by the dispersion or scatter of permeability values. A homogeneous reservoir has a permeability variation that approaches zero, while an extremely heterogeneous reservoir would have a permeability variation approaching one.s

Given the permeability distribution of a layered reservoir the heterogeneity can be expressed using the Dykstra-Parsons coefficient.

Layer #
Layer Thickness
(ft)

Permeability of the layer (md)
1 3 365
 2  3  275
 3  3  165
 4  3  121
 5  3  73
 6  3  37
 7  3  19
 8  3   9.3
 9  3   3.5
 10  3   1.9

 

The coefficient is expressed as follow:

V=(k50-k84.1)/k50
V: coefficient of Permeability Variation
k50: Permeability mean
k84.1: Permeability mean plus a standard deviation

 

 Using this spreadsheet is you can get the results in a automated way.

Just introduce the permeability and thickness pairs, sort and calculate.

 Data table

 

Then a log-normal (probability) chart show the points and a best fit line.

The results can be readed in  a box at the left of the chart.

 

Probability chart
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