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Sequence Stratigraphy Linked with Other Stratigraphic Disciplines - Example from Lower Devonian, Eastern Saudi Arabia
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
The Lower Devonian Upper Tawil-Jauf Formation of Saudi Arabia is a widespread siliciclastic succession composed of fluvial, tidal and shoreface deposits. The section outcrops in northern Saudi Arabia also contain carbonates. To define and predict sandstone reservoir architectures, a sequence stratigraphic analysis has been applied. Previous work proposed several sequence stratigraphic interpretations. The current study presents a new and refined interpretation, integrating ichnology, biostratigraphy and chemostratigraphy, and their relationship to diagenesis. Three main transgressive-regressive cycles are identified from cores and outcrop, and maximum flooding surfaces can be correlated at the regional scale. Ichnofabrics observed in cores give more accurate interpretation of key stratigraphic surfaces.
Palynological results provide Lochkovian to Emsian ages and show a relationship between bio-events and sedimentary cycles. Chemostratigraphic analysis from a few cored wells demonstrates that mineralogical zonation can be correlated with defined stratigraphic sequences. Common patchy concretions of ferroan dolomite are observed in the sandstones below the D3B maximum flooding surface and appear to indicate a close relationship between diagenetic processes and sea level fluctuation.