TITLE:
Microbiostratigraphy, microfacies and sequence stratigraphy of upper cretaceous and paleogene sediments, Hendijan oilfield, Northwest of Persian Gulf, Iran
AUTHORS:
Bahman Soleimani, Alireza Bahadori, Fanwei Meng
KEYWORDS:
Upper Cretaceous; Paleogene; Planktonic Foraminifera; Microfacies; Sequence Stratigraphy; Hendijan Oil Field (SW Iran)
JOURNAL NAME:
Natural Science,
Vol.5 No.11,
November
4,
2013
ABSTRACT:
Hendijan
oilfield is located on Northwest of Pesian Gulf offshore of Iran and
geologically in the Dezful embayment. In this study, the paleosedimentary depositional
environment of the Early Cenomanian to Late Eocene deposits of the Sarvak, Ilam,
Gurpi, Pabdeh and JahrumPabdeh Formations was evaluated using microbiostratigraphy,
microfacies and D-INPEFA curves which are an accurate method in sequence
stratigraphy in terms of regression and transgression of the sea. Also, we
used limited elemental geochemical data of oxygen and carbon isotopes in
compare with palaeontological data to infer the upper part, 10 m, of the Sarvak
Formation. Statistical correlation analyses of geochemical data from upper
part of the Sarvak Formation enable inference of differences in paleoconditions
at this part and Sarvak Formation, and another Formation, Ilam, was distinguished.
Palaentilogical analysis using planktonic foraminifera and calcareous nannofossils
enables inference about time scale of each Formation. Petrographic data and
different sediment textures support those inferences resulted from Gamma ray
logs as D-INPEFA curves about different paleo-conditions that occurred during
the development of the studied Formations. Synthesis of the analyses leads to
the final interpretation that upper Cretaceous, Sarvak, Ilam and Gurpi
Formations, at the Hendijan oil field were formed in a carbonate ramp that was
likely closed to the open sea, where Gurpi Formation was deposited, by a
shallow barrier that allowed seawater recharge into the basin and deep marine
basin where Paleogene sediments, Pabdeh and Jahrum-Pabdeh, were deposited.