Histograms

Plot distributions of static reservoir properties and optionally fit probability distributions to the data.

Plot porosity and permeability distributions

Plot porosity and x-direction permeability from the Norne model. Use 20 bins for each histogram, fit a normal distribution to porosity, and fit a lognormal distribution to permeability:

plopm -i NORNE_ATW2013 -v poro,permx -hist '20,norm 20,lognorm' -ag 0 -sg 1,2 -fs 15,5 -ll 'upper center' -y '[0,10000] [0,23000]' -c '#7274b3,#cddb6e'

Porosity with a fitted normal distribution and x-direction permeability with a fitted lognormal distribution.

Histogram syntax

Use plopm -hist to set the number of bins and an optional fitted distribution:

20

Creates a histogram with 20 bins and no fitted distribution.

20,norm

Creates a histogram with 20 bins and fits a normal distribution.

20,lognorm

Creates a histogram with 20 bins and fits a lognormal distribution.

Separate specifications for multiple plots with spaces. In this example, 20,norm 20,lognorm applies the normal fit to poro and the lognormal fit to permx.

Format the figure

The remaining options control the subplot layout and appearance:

• plopm -ag disables the axis grid.

• plopm -sg places both histograms in one row with two columns.

• plopm -fs sets the complete figure size to 15 by 5 inches.

• plopm -ll places each legend at the upper center.

• plopm -y applies separate y-axis limits to the two plots.

• plopm -c assigns a different color to each histogram.

The two y-axis limits are separated by a space and correspond to the variables in the order supplied through plopm -v.

Note

Lognormal fitting is appropriate only for positive values. Review the data and selected property before choosing a fitted distribution.

Reproduce this example

Run the complete workflow from the repository root:

. ./tests/scripts/docs_histograms.sh

View script

View raw script

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