rock-MASS {MASS} | R Documentation

## Measurements on Petroleum Rock Samples

### Description

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.

### Usage

    data(rock)

### Format

A data frame with 48 rows and 4 numeric columns.

`area` | area of pores space, in pixels out of 256 by 256
`peri` | perimeter in pixels
`shape` | perimeter/sqrt(area)
`perm` | permeability in milli-Darcies

### Source

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

Katz, R. (1995) Spatial Analysis of Pore Images. D.Phil. thesis, Department of Statistics, University of Oxford.

### References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

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