rock {boot}R Documentation

Measurements on Petroleum Rock Samples

Description

The rock data frame has 48 rows and 4 columns.

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

This data frame contains the following columns:

area
The area of the pores space (in pixels out of 256 x 256).
peri
The total perimeter of the pores (in pixels).
shape
The shape of the pores space defined as peri/sqrt(area).
perm
The permeability in milli-Darcies.

Source

The data were collected and kindly made available by R. Katz of the Department of Statistics at the University of Oxford.

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

References

Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.

Venables, W.N. and Ripley, B.D. (1994) Modern Applied Statistics with S-Plus. Springer-Verlag.