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closure

1. n. [Geology]

The vertical distance from the apex of a structure to the lowest structural contour that contains the structure. Measurements of both the areal closure and the distance from the apex to the lowest closing contour are typically incorporated in calculations of the estimated hydrocarbon content of a trap.

See: anticlinal trapunconformity trap

Map and cross-section of closure and spill point of trap.

2. n. [Geology]

The area, or areal closure, included in the lowest closing contour of a trap. Measurements of both the areal closure and the distance from the apex to the lowest closing contour are typically incorporated in calculations of the estimated hydrocarbon content of a trap.

See: anticlinal trapcontourunconformity trap

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