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Petroleum Geology

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What Makes Petroleum? | Source for the Oil: | Characteristics of Reservoir Rocks: | Maturation and Migration: | Structural Trap: | Anticline Trap: | Fault Trap: | Salt Dome Trap: | Recent News In Petroleum | Bibliography:
Maturation and Migration:

Petroleum starts off in an impermeable situation with sand and silt, because algae accumulates on the bottom of the sea floor with silt and sand and cannot readily pass through it. It must, however, move into a more permeable situation for us to be able to drill and attain oil. Petroleum is able to do this because it is mixed in with water and it is lighter than water and will float on top of it; overtime it will sit on top of the sediment (Instructional).

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http://www-class.unl.edu/geol101i/09_structural.htm

Petroleum and natural gas climb up the rock and become trapped at the top, at the fold axis. Gas is lighter than petroleum and accumulates at the very top (Instructional).