rock {modreg} | R Documentation

## Measurements on Petroleum Rock Samples

### Description

Measurements on 48 rock samples from a petroleum reservoir.

### Usage

    data(rock)

### Format

A data frame with 48 rows and 4 numeric columns.

[,1] | area | area of pores space, in pixels out of 256 by 256
[,2] | peri | perimeter in pixels
[,3] | shape | perimeter/sqrt(area)
[,4] | perm | permeability in milli-Darcies

### Details

Twelve core samples from petroleum reservoirs were sampled by 4 cross-sections. Each core sample was measured for permeability, and each cross-section has total area of pores, total perimeter of pores, and shape.

### Source

Data from BP Research, image analysis by Ronit Katz, U. Oxford.

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