petroleum trap

petroleum trap

[pə′trō·lē·əm ‚trap]
(geology)
Stable underground formation (geological or physical) of such nature as to trap and hold liquid or gaseous hydrocarbons; usually consists of sand or porous rock surrounded by impervious rock or clay formations.
References in periodicals archive ?
The primary petroleum trap styles consist of tilted extension fault blocks and sandstone drapes or carbonate buildups over highstanding rift blocks.
Subsequently geophysical and geological surveys were conducted within the refuge to determine if any petroleum traps could be detected in the subsurface of the rock strata within the refuge.
But Martens and his colleagues, who have examined the ratios of various carbon isotopes in the deep-sea methane, now suggest that it does not seep out of petroleum traps beneath the seafloor.
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