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  • Print publication year: 2007
  • Online publication date: October 2009

5 - The nature and origins of flowing fluids


Given the immense amount of organic matter in the sediments of the Earth's crust, it is evident that the geological consequences of this subterranean generation of gas must also be immense.

H. Hedberg, 1974

The fluids available to flow through the seabed include various types (liquid and gaseous, organic and inorganic) derived from microbiological and geological processes – some close to the seabed, some distant both in space and time. To provide a foundation for subsequent chapters in which we look at the fate of these fluids, this chapter provides a brief review of the nature and origins of the fluids, and identifies some areas where controversy still persists.

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