TITLE:
Factor Controlling Reservoir Properties and Flow Unit Determination in the Ilam Formation of Dezfol Embayment at Zagros Fold-Thrust Belt, Southwest of Iran
AUTHORS:
Peiman Rezaie, Akram Jooybari, Majid Mehdi Pour, Mansour Gorbani
KEYWORDS:
Component, Diagenetic Process, Flow Unit, Petrophysic, Reservoir Characterization, Ilam, Formation, Dezfol Embayment
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.7,
July
28,
2016
ABSTRACT: Dezfol embayment in the Southwest of Iran is located in the Zagros
fold-thrust belt, which is one of the world’s
largest petroleum provinces. Ilam Formation (Santonian-Companian) is one of the reservoir formations in this area that has been less studied. This
paper focused on reservoir properties in this
formation using petrography and petrophysics data. According to the petrography studies Ilam Formation
composed of limestone as dominant lithology. Detailed petrographic
analyses, have led to
identification of 10 micro-facies which are represented as a carbonate ramp depositional model. Also petrographic analyses are
revealed that cementation, dissolution, compaction
and dolomitization are most important digenetic processes. Detailed petrographic analyses and petrophysics data showed that due to
mud-supported nature of more facies (inherited low reservoir potential from their depositional settings),
diagenetic process plays an important role in
increasing of reservoir quality. However cementation and dissolution had negative and positive effects on Ilam reservoir formation, respectively.
Finally at the end for better correlation
and to create a flow unit, according to the petrography data and using
petrophysics log, this reservoir is divided into 5 units (flow unite) by using
Geolog software and then they have
been correlated across the field.