Chapter 2

Offshore Geology and Operations


The geology of the seabed is an important factor in determining where marine crude oil and natural gas projects can be effectively located. Similar to onshore geology, there are mountain ridges and valleys (sometime referred to as basins) and during the geologic timescale, the movement of the tectonic plates has produced areas of the seabed better suited to formation containing crude oil and natural gas than others. As new crust forms at the expanding oceanic ridges, old oceanic plates are consumed at deep ocean trenches found at the plate boundaries opposite the mid-ocean ridges. In these subduction zones, the edge of an ocean plate is driven below the continental plate and is eventually ...

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