ANSWERS: 2
  • Some of the volume is collapsed by subsidence, some is refilled by the intrusion of groundwater or brine.
  • Petroleum doesn't actually form in "pools" of liquid. Instead, it saturates the pores of rock layers. Extracting the oil from the rock layer leaves the rock intact in the same way that squeezing the water out of a sponge leaves the sponge intact . . . http://en.wikipedia.org/wiki/Oil_reservoir

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