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stratigraphic trap

1. n. [Geology]

A variety of sealed geologic container capable of retaining hydrocarbons, formed by changes in rock type or pinch-outs, unconformities, or sedimentary features such as reefs. Structural traps, in contrast, consist of geologic structures in deformed strata such as faults and folds whose geometries permit retention of hydrocarbons.

See: fault traphydrocarbonpinch-outreefsedimentarystructural trapsubsalttrapunconformity

Block diagrams of structural and stratigraphic traps.

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