[en] The role of diagenesis in affecting (reduction or enhancement) reservoir quality
in the Faraghan Formation in Darang #1 well was investigated. The Faraghan
Formation is mainly composed of sandstone facies along with minor mudstone
and siltstone and grades upward into mixed carbonate –siliciclastic facies and
then to Dalan Formation carbonates. Depositional environment of this formation
comprises various sub-environments of a delta setting in the lower part of the
formation which grades upward into a shallow marine clastic environment in the
upper part. The processes enhancing reservoir quality include dissolution of
carbonate grains and cements and alteration of feldspar grains. Burial history
diagram shows that after deposition during Lower Permain, the formation
underwent a rapid burial up to 1000 meters below sea level in Upper Permian.
Then a slight uplift (about 100 meters) and gradual burial followed up to Mid-
Jurassic. Afterwards the formation experienced a series of rapid and moderate
uplift from Mid-Jurassic to Tertiary when the formation uplifted to around 2500
meters above sea level. The suitable conditions resulting in dissolution took
place in shallow buried sandstones. These conditions occurred two times during
burial history: at the early stages of eodiagenesis and during telodiagenesis. The
major processes deteriorating reservoir quality include compaction and
cementation. Major cement types include carbonate cements (dolomite,
siderite), clay cements (kaolinite, sericite, chlorite), silica cement and pyrite
cement. The most abundant cement is the carbonate cement especially dolomite.
The dolomite cement occurs as intergranular and poikilotopic forms. The most
frequent clay cement is sericite which dominates in sitstones and lithicarenites.
Silica cement, where present, fills all the pore spaces. The least frequent cement type is pyrite which is found in two forms of poikilotopic and framboidal.
Where it is found in the form of poikilotopic cement, it massively fills the pore
spaces and deteriorates the porosity and permeability of the sandstones.
Diagenetic factors controlling reservoir quality in the Faraghan Formation (Lower Permian), Darang Field, Southern Iran
Publication date :
2011
Journal title :
Energy Exploration and Exploitation
ISSN :
0144-5987
Publisher :
Multi-Science Publishing Co Ltd, Brentwood, United Kingdom
Volume :
29
Issue :
2
Pages :
109 - 128
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
In this paper we are going to discuss the role of diagenetic products and their timing
in affecting reservoir quality of the Faraghan Formation in Darang#1 well located in
Coastal Fars region in the Zagros area.
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