Lect6 -- Oil

Sediments a typical case of anoxic burial the santa

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Unformatted text preview: en à༎ carbon dioxide + water Without oxygen, the breakdown of organic material cannot proceed – so we can preserve CH2O, etc, in sediments A typical case of anoxic burial: The Santa Barbara Basin Why is the Santa Barbara Basin anoxic? Laminated cores from Santa Barbara Basin: Oscilla>on of oxic and anoxic waters The simple recipe for making petroleum •  Grow some marine critters; let them die and sink to the seafloor •  Make sure they are buried in an anoxic environment so they are not consumed by other hungry seafloor critters Transforming organic sediment to petroleum source rock: Heat The “Oil Window”: Narrow range of burial condi>ons that generate oil The simple recipe for making petroleum •  Grow some marine critters; let them die and sink to the seafloor •  Make sure they are buried in an anoxic environment so they are not consumed by other hungry seafloor critters •  Heat organic sedimentary rock by burial… but make sure you heat it to just the right temperature! Source rock contains petroleum… But it’s not exactly crude oil The importance of porosity …and permeability …and permeability Hi porosity: allows a sedimentary rock to store fluid (like oil) Hi permeability: allows a sedimentary rock to let fluid flow Low permeability: prevents flow of a fluid Reservoir Rocks: Where oil is...
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