TITLE:
Investigation of Microfacies—Electrofacies and Determination of Rock Types on the Aptian Dariyan Formation NW Persian Gulf
AUTHORS:
Katayoon Rezaeeparto, Hossein Rahimpour Bonab, Ali Kadkhodaie, Mehran Arian, Elham Hajikazemi
KEYWORDS:
Dariyan Formation, Micro Facies, Soroush Field, Rock Types
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.1,
January
28,
2016
ABSTRACT: Dariyan (Shuaiba)
Formation is one of the main reservoir units in the Persian Gulf and South
Western Iran. The microfacies and depositional environment of this formation is
been investigated in the current study and influencing factors in reservoir
characteristics have been discussed for Dariyan reservoir in the Soroush oil
field. Facies analysis conducted on core and cutting samples indicated that
Dariyan Formation is mainly deposited on a carbonate ramp setting with a shallow intra shelf basin. In
addition, it has been demonstrated that facies changes reflect the main controls of the tectonic and climate
(sea level fluctuations) during the deposition of these sediments. To determine
the reservoir unites in this formation, 5 electrofacies were determined by
neural network method that it is using different petrophysical logs (i.e. GR, PHIE and SWE). Using rock typing
as the best way to establish an association between the various collected data
(e.g. logs and cores) and geological descriptions 4 hydraulic flow units or
rock types, determined on the basis of the Flow Zone Indicator (FZI) method in
the Dariyan Formation of the Soroush field. Establishing a correlation between
microfacies and rock types, the carbonate zones with moderate to good reservoir
properties and also the intervals with the highest reservoir quality were
determined.