Trap

A sedimentary or tectonic structure where oil and/or natural gas has accumulated. These are structural highs where a porous rock unit is capped by an impermeable rock unit. Oil and gas trapped within the porous rock unit migrate to a high point in the structure because of their low density. See oil trap.

Related terms:

• fault trap
• petroleum trap
• stratigraphic trap
• permeability trap
• combination trap
• structural trap
• oil trap
• porosity trap
• secondary stratigraphic trap
• anticlinal trap