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four-dimensional (4D) seismic data

1. n. [Geophysics]

Three-dimensional (3D) seismic data acquired at different times over the same area to assess changes in a producing hydrocarbon reservoir with time. Changes may be observed in fluid location and saturation, pressure and temperature. 4D seismic data is one of several forms of time-lapse seismic data. Such data can be acquired on the surface or in a borehole.

See: acquisitiontime-lapse seismic data

Maps of reservoir changes observed by repeated seismic surveys.

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