Paleoecology of Upper Eocene-Chattian deposits (Pabdeh and Asmari formations) in Maron oil field

Authors

1 Department of Geology, Faculty of Basic Science, Lorestan University, Khorramabad, Iran.

2 Associate professor, National Iranian South Oil Company (NISOC), Ahwaz, Iran.

3 Ph.D. Student, Sedimentology and Sedimentary Petrology, Department of Geology, Faculty of Science, Shahid Beheshti University

Abstract

In the Current research paleoecology of the Upper Eocene (Pabdeh Formation) and Chattian (Asmari Formation) has been studied by analyzing 250 thin sections in the Maron oil field (A and B). in the studied wells the light conditions vary from the dark to maximum (aphotic to euphotic), salinity from the normal to slightly higher than normal (34- 40 Psu), and the nutrients fluctuate from oligotrophic to eutrophic. In the Upper Eocene interval (Pabdeh Formation) the abundance of Planktonic foraminifera indicate a quiet, low energy and deep marine setting and in the Oligocene the occurrence of larger benthic foraminifera in the basal parts of the Asmari Formation (distal part of the middle ramp) point to low hydrodynamic energy conditions and a stable substrate. The presences of hyaline foraminifera with lenticular, thicker tests and smaller in size in the proximal parts of the middle ramp suggest higher energy and light levels and a higher energy shallow marine environment with unstable and firmground substrate.

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History

  • Receive Date: 06 January 2023
  • Revise Date: 25 April 2023
  • Accept Date: 26 April 2023

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