Microfacies and depositional environment of Asmari formation in the Zeloi oil field, Zagros basin, south-west Iran

• Yasin Abyat ^[1] ; Ahmad Abyat ^[1] ; Abdolkhalegh Abyat ^[1]
  1. [1] Islamic Azad University

     Islamic Azad University

     Irán

     
• Localización: Carbonates and Evaporites, ISSN 0891-2556, Vol. 34, Nº. 4, 2019, págs. 1583-1593
• Idioma: inglés
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• Resumen

  • The Oligocene–Miocene Asmari Formation is well known as a major hydrocarbon reservoir in southwestern Iran. To study the microfacies and sedimentary environment of Asmari Formation in the Zagros basin (south-west Iran), No. 6 well and No. 11 well sections in Zeloi oil field were selected. 500 thin sections were studied for petrographic and facies analysis. Based on petrographic and sedimentology analysis of the Asmari Formation in these sections, 13 carbonate microfacies and 1 petrofacies can be identified into three main depositional environments consisting of: outer ramp, middle ramp and inner ramp. The outer ramp environment is characterized by the presence of abundant planktonic foraminifera and echinoid fragments. The middle ramp environment is represented by the presence of echinoids and planktonic foraminifera, red algae and perforate foraminifers. In the inner ramp, the most allochems are ostracoda, imperforate and perforate benthic foraminifera, algae ball, peloid and oncoid.