#### 8.2.57.58 tblish.dataset.rock ¶

Static Method: `out =` rock `()` ¶

  Measurements on Petroleum Rock Samples

  #### Description ¶

  Measurements on 48 rock samples from a petroleum reservoir.

  #### Format ¶

  `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.

  #### 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.

  #### Examples ¶

      t = tblish.dataset.rock;

      figure
      scatter (t.area, t.perm)
      xlabel ("Area of pores space (pixels out of 256x256)")
      ylabel ("Permeability (milli-Darcies)")