Calciturbidites in Pabdeh Formation and their reservoirPotential

Category Sedimentology
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 24 May 2008

   Abstract:
      The Pabdeh Formation of Late Paleocene to Early Oligocene age (over 300 meters) consists of limestone, cherty argillaceous limestone, marl and shale in Zagros area. Its lower boundary with the Gurpi Formation is unconformable but its upper contact with the Asmari Formation is conformable. Field and petrographic investigations led to recognition of several pelagic and calciturbidite facies. The pelagic deposits include radiolarian, globigerinid and globorotalid mudstone to packstone and dark grey shale/marl.
   The re-sedimented carbonates (calciturbidite) consist of shallow marine to planktonic bioclast mudstone - grainstone and intraclast packstone interbedded with pelagic facies. Sea-level highstand during the deposition of Jahrum Formation (Eocene) resulted in high rate of carbonate production, which led to off platform transport and deposition of calciturbidites. Calciturbidites of the Pabdeh Formation, most probably, have good reservoir quality.

General:
     The Pabdeh Formation of Late Paleocene to Early Oligocene age (over 300 meters) consists of limestone, cherty argillaceous limestone, marl and shale in Zagros area. Its lower boundary with the Gurpi Formation is unconformable but its upper contact with the Asmari Formation is conformable. Field and petrographic investigations led to recognition of several pelagic and calciturbidite facies. The pelagic deposits include radiolarian, globigerinid and globorotalid mudstone to packstone and dark grey shale/marl.
   The re-sedimented carbonates (calciturbidite) consist of shallow marine to planktonic bioclast mudstone- grainstone and intraclast packstone interbedded with pelagic facies. Sea- level highstand during the deposition of Jahrum Formation (Eocene) resulted in high rate of carbonate production, which led to off platform transport and deposition of calciturbidites. Calciturbidites of the Pabdah Formation, most probably, have good reservoir quality.

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