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An interesting idea, highlighted at the 2015 SEG Convention, was about carrying out seismic impedance inversion in the depth domain. “Inversion” refers to the transformation of seismic amplitude data into acoustic impedance data. Impedance inversion has been conducted in the time domain for the last four decades. If it has to be carried out in depth, a few questions come to mind—what is so different about carrying out inversion in depth, rather than time, how does it help, and if it’s important, why did we have to wait four decades to talk about it now? Let us address each question, with the last one first.

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