Dykstra & Parson coefficient of permeability variation
Data table
Dykstra-Parsons coefficient of permeability variation in layered reservoir
Dykstra-Parsons coefficient of permeability variation
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.
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.
