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Discussion

Secondary porosity in a hard rock arises from

  • A.the rock's mineral composition
  • B.compaction of the rock long after its burial
  • C.joints, fractures and solution cavities
  • D.the spaces between original grains

Answer: C

Granite and basalt have negligible primary porosity, so all their yield comes from the fracture network and, in limestone, from dissolved channels. It follows that a well in hard rock succeeds only if it strikes fractures.

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