Trap Style
In geology, "trap" refers to the stratigraphic or tectonic structural feature that ensures the juxtaposition of reservoir and seal such that hydrocarbons remain trapped in the subsurface, rather than escaping (due to their natural buoyancy). Oil and gas trapped within the porous rock unit migrate to a high point in the structure because of their low density. In the Sirte Basin the dominant trap style is structural (84 percent), with the remainder considered stratigraphic or a combination of the two. As examples of combined traps, bioherm developments in the Paleocene Zelten Group are found on horst blocks, and clastic stratigraphic traps such as at Sarir or Messla field are superimposed on structures.
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