Siliciclastic sedimentation derives from exposed continental regions delivering terrigenous sediment via rivers and deposition along a submerged siliciclastic shelf. This is termed a non-marine or terrigenous siliciclastic system. Sea level fluctuations typically control sedimentation through time. Thus. Relative sea level curves are typically constructed to explain sedimentation in the context of what is known as sequence stratigraphy. High-stand Systems Tract (HST) refers to the maximum high sea level for the period under analysis. Transgressive Systems Tract (TST) refers to a sea level that is transgressive or moving to inundate more shoreline. Low-stand Systems Tract (LST) refers to the sea level minimum where subaerial exposure is the most extensive. Falling Regressive Systems Tract (FRST) refers to a sea level that is falling.
Carbonate shelves are inundated
long enough to develop an accumulation of shell material in an open sea or, in
some cases, a freshwater lake. They are exposed when sea level drops and
undergo different alteration processes, or diagenetic processes, than
siliciclastic shelves. Diagenesis can significantly overprint the original
depositional fabric through dolomitization, dissolution, karstification, and
cementation. Some diagenetic processes also occur on exposed siliciclastic shelves,
but they are more extensive and more complex on carbonate shelves. This has
implications for oil & gas exploration, including seismic interpretation.
Siliciclastic shelves are generally more predictable, although configurations
can be complicated by overlapping channels and delta lobes.
The following graphic was posted
by Ibrahim Nasser, Geoscientist at Capricorn Energy, in a LinkedIn post. It was sourced and modified as noted at the bottom right of the graphic.
References:
LinkedIn
post by Ibrahim Nasser, Geoscientist at Capricorn Energy. August 2026. (25)
Post | Feed | LinkedIn
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