Numerical Modelling of Seismic Character of Depositional Sequences

Analytical and numerical models of sediment transport and deposition are being increasingly used to investigate controls on sediment variability in depositional sequences. In this paper we consider the stratigraphic response to eustatic sea-level (amplitude and period) and local controls, such as sediment supply and subsidence, and their impact on the resulting reflectivity along a notional well situated in an outer neritic location. The development of key stratal surfaces shows a systematic relationship with respect to the various stages of an aggradation curve.<br><br>The results of seismic modelling indicate that seismic events related to sediments deposited under the influence of systematic changes in sea level show a distinctive pattern that approximates the derivative of the original seismic wavelet, while their amplitudes indicate the degree of evolution along the stages of the aggradation curve. If appropriate conditions are met, this distinctive character can be used to distinguish such seismic events from the ones associated with unconformities or layers not directly associated with these controls.