Seismic amplitude changes may tell us something about reservoir lithology, porosity, and/or fluids. However, seismic tuning effects are potentially much larger than amplitude variations due to geological changes. Understanding this key concept is critical to effective seismic interpretation.
Allan McKay, Johan Mattsson and Jonathan Midgley, PGS
See the 'Big Picture' and the 'Details'. Using a towed streamer EM system makes it possible to use the same data to determine resistivity on a scale of a few hundred kilometres, and at the scale of the reservoir.
The advent of the individually steerable streamer has lead to the development of WesternGeco’s ‘Over/Under’ seismic recording technique, resulting in a dramatic improvement in seismic quality and the ability to visualise sub-salt and sub-basalt.