Paper Summary
The author reviews most of the SEG 2018 abstracts on 4D matters, with the exception of the more academic waveform inversion concepts unless they explicitly facilitate more efficient or flexible 4D data acquisition. This material is equally relevant for the EAGE Australasian Workshop on Continuous Improvement in 4D Seismic which is held in Perth, Australia in the week immediately preceding the SEG 2018 annual conference.