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The feasibility of depositing the reservoir into hydrogen-sulfide as a result of EOR process in Cheshm-e Khosh oil field, western Iran

  • Mohammad Hossein SaberiEmail author
Original Paper
  • 31 Downloads

Abstract

This paper focuses on analyzing different mechanisms of hydrogen-sulfide contamination in the Cheshm-e Khosh oil field, located at western Iran. The Asmari Formation is reservoir layer of the field and consists of carbonate-evaporative facies at upper parts and carbonate-clastic facies in the lower part. This study reveals that there is no possibility for thermochemical sulfate reduction, thermal cracking of sulfur-containing organic components, or reduction of metal sulfides such as pyrite and bacterial sulfate reduction, under present circumstances. Assumption of hydrogen-sulfide migration from the lower layers is invalid because, due to the presence of clastic facies in the lower part of the Asmari and remarkable existence of metal-containing minerals, the hydrogen-sulfide reacts with ferric ions and settles in form of pyrite. In addition to covering possibility of hydrogen-sulfide generation mechanisms, possibility of any growth in amount of sulfate-reduction bacteria as a result of water injection (EOR process) was also studied. Results revealed that these bacteria do not exist in the reservoir at the present time and should be avoided in the future by water injection project and drilling activities.

Keywords

Hydrogen-sulfide Asmari Formation Sulfate-reduction bacteria Thermal history 

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.Petroleum Engineering DepartmentSemnan UniversitySemnanIran

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