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gas chimney

1. n. [Geophysics]

A subsurface leakage of gas from a poorly sealed hydrocarbon accumulation. The gas can cause overlying rocks to have a low velocity. Gas chimneys are visible in seismic data as areas of poor data quality or push-downs.

See: hydrocarbon indicatorpush-downvelocity

Seismic displays of a gas chimney.

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