This series of chapters is designed for geoscientists in their first few years of working in the industry, or those wanting to brush up on a range of applied geological and reservoir knowledge. The eBook will begin by covering fluvial architecture and processes from an applied perspective, followed by shallow- and deep-marine architecture and geomorphology.
This chapter specifically looks at depositional environments of shallow-marine reservoirs; their geometry, and common sub-environments. The schema described are those employed by the Ava Clastics application.
Classifying coastal processes
All shallow marine depositional systems are affected to some degree by several depositional processes, divided into two main categories: first, a seaward prograding system whereby there is a large sediment supply (e.g deltas, strandplains, and tidal flats), and secondly, a retrograding system associated with relative sea-level rise (e.g. estuaries, strandplains, and lagoons) (Siddiqui et al., 2017) (Fig. 1). A ternary diagram is used to define these processes in relation to wave, tidal and fluvial influence (Fig. 2), and the relative importance of depositional environment in controlling depositional architecture.
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