Gas Storage Fields in Illinois

• Mt. Simon Sandstone (Cambrian)

  • Major Gas Storage reservoir
  • Deepest porous unit in Illinois
  • Several hundred feet thick
  • Very heterogeneous reservoirs

• St Peter Sandstone (Ordovician)

  • Major Gas Storage reservoir strata
  • Highly porous and permeable
  • Relatively homogeneous
  • Widespread sandstone in Illinois

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