Abstract
Summary During this study the part of the South Caspian Basin covering the Absheron, Shah Deniz, Umid-Babek, Nakhchivan, and Zafar-Mashal structures was investigated in terms of size of structures and their development over time. Our prime focus was to investigate the structural development of the five structures based on isopach and paleo-structure maps created for Top Pereryva (Fasila) stratigraphic level. All structures started forming during Akchagyl time, with Shah Deniz and Nakhchivan structures being most prominent, and Absheron and Umid-Babek being slightly less pronounced at this stage. Structural growth continued throughout late Pliocene and Pleistocene time. Zafar-Mashal structure was formed slightly later, primarily during Pleistocene time. Structures at Top Pereryva (Fasila) stratigraphic level were present accordingly, although due to higher subsidence rates in the southern part of the South Caspian basin area more or less pronounced. Absheron structure bears a relatively high risk of not being closed towards North in up-dip direction, Nakhchivan structure bears a similar risk towards Northwestern side, however not as clear due to data limitations. Shah Deniz and Umid-Babek structures are regarded similar with respect to their structural growth history, whereas Shah Deniz structure overall is more pronounced. Zafar-Mashal overall forms a structure only during Pleistocene.
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