oil well core section that has been plugged and cut in half - an unusual example

This oil well 4" diameter core section is from a group of cores where well data was lost.

Usually a formation can be identified from the drill cuttings washed from the drilling mud, but sometimes a coring bit is used to produce continuous core. A plug was occasionally removed from a core for determination of permeability and porosity. Typically, sections up to three feet long are stored in core trays and boxes, and core libraries allow a view of rocks that might not be locally exposed for study at the surface. This example is useful in the classroom, though formation and oil field data have been lost. 

Both sides are shown.

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