Dictionary:Imaging

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1. Migration (q.v.). Transforming seismic data recorded as a function of arrival time into the scaled features that produced the record. Imaging involves focusing and positioning. Focusing involves collapse of diffractions, reproducing the wavelet character and sharpening the image and event terminations; positioning involves event termination relative to other features (faults, salt flanks, unconformities, etc.) and locating events at the proper depth and location. Imaging with CMP data implies the exploding reflector concept. In wave-equation migration, the wavefield P(x,y,z,t) is first found by downward continuation and then P(x,y,z,0) yields the image. 2. See remote sensing. 3. Developing a conductivity/resistivity distribution that honors measurements and has geological meaning without the use of a parameterized model.