PETROGRAPHICAL AND MICROFACIES STUDY OF JERIBE FORMATION (M. MIOCENE) IN ASHDAGH MOUNTAIN, KURDISTAN REGION, IRAQ

  • Rzger A. Abdula Soran University, Department of Petroleum Geosciences, Soran, Kurdistan Region, Iraq
  • Mohammad S. Nourmohammadi Soran University, Department of Petroleum Geosciences, Soran, Kurdistan Region, Iraq
  • Gailan R. Rashed Soran University, Department of Petroleum Geosciences, Soran, Kurdistan Region, Iraq
  • Nabard Q. Saleh Soran University, Department of Petroleum Geosciences, Soran, Kurdistan Region, Iraq
Keywords: Jeribe Formation, Ashdagh Anticline, Miocene, microfacies, diagenetic processes

Abstract

This study deals with the Middle Miocene Jeribe Formation in the Ashdagh Anticline in Darzila Village near Sangaw in Sulaimani Governorate, Iraq. Stratigraphic analysis has shown that Jeribe Formation consists of recrystallized and dolomitized, mostly limestone which, as a whole, supported its reservoir potential. Petrography has provided a diversity of fauna such as large benthic foraminifera, Astrotrillina sp., Miliolid in addition to Borelis melo curdica, which for a long time has been considered an index fossil for this formation. Other fauna includs several types of mollusks. The Jeribe carbonates were subjected to various diagenetic processes ranging from micritization, dolomitization, cementation, compaction, dissolution, and others. The formation consists of three major limestone microfacies: mudstone, wackestone, and packstone/ grainstone. The evidence from petrography and facies analysis support that the Jeribe Formation was deposited in restricted marine environment.

Published
2019-09-24
Section
Articles