Erik Scott, Arnold H. Bouma, 2004. "Chemostratigraphy of Deep Water Silts and Shales", Depositional Processes and Reservoir Characteristics of Siltstones, Mudstones and Shales, Erik D. Scott, Arnold H. Bouma
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Stratigraphic correlation of deep water siliciclastic sequences generally is based on biostratigraphic, palynological, and lithologic markers. However, in sequences that are barren of, or have limited fossil assemblages along with inconclusive lithologic correlation, the chemical composition of the silts and shales in the stratigraphic section can be used to determine potential tie points in the basin fill. This chemical composition can be used to correlate sedimentary packages across a basin or even potentially between adjacent basins. Successfully used, correlation of the chemical composition of shales and silts can give a fuller understanding of the timing of the basin fill and depositional environments.
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Siltstones, mudstones and shales have been studied mainly with regard to general transportdeposition processes and clay mineralogy. A small group of investigators, with differing backgrounds, have worked on these fine-grained deposits. Recent studies on deepwater deposits from cores and outcrops indicate that the presence of finer-grained deposits greatly affect the fluid flow properties of deepwater reservoirs. Characteristics and rock properties of these deposits, which resulted from a variety of depositional processes, are just beginning to be understood.