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


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.


Hydrogen-sulfide Asmari Formation Sulfate-reduction bacteria Thermal history 


  1. Ben-Dov E et al (2009) Long-term surveillance of sulfate-reducing bacteria in highly saline industrial wastewater evaporation ponds. Aquatic Biosystems 5(1):2 (October 2, 2016)Google Scholar
  2. Cavallaro AN et al (2005) Oilfield reservoir souring during waterflooding: a case study with low sulphate concentration in formation and injection waters. In SPE International Symposium on Oilfield Chemistry, Society of Petroleum Engineers. (October 2, 2016)
  3. Foti MJ et al (2008) Bacterial diversity and activity along a salinity gradient in soda lakes of the Kulunda Steppe (Altai, Russia). Extremophiles 12(1):133–145 (October 2, 2016)CrossRefGoogle Scholar
  4. Grimes WD, McNeil RI (2005) Prediction of hydrogen sulfide and carbon dioxide in HPHT wells. In SPE High Pressure/High Temperature Sour Well Design Applied Technology Workshop, Society of Petroleum Engineers. (October 2, 2016)
  5. Heydari E (1997) The role of burial diagenesis in hydrocarbon destruction and H2S accumulation, Upper Jurassic Smackover Formation, Black Creek Field, Mississippi. AAPG Bull 81(1):26–45Google Scholar
  6. Hillier S, Marshall JEA (1988) A rapid technique to make polished thin sections of sedimentary organic matter concentrates. J Sediment Petrol 58(4):754–755CrossRefGoogle Scholar
  7. Khatib ZI, Salanitro JR (1997) Reservoir souring: analysis of surveys and experience in sour waterfloods. In SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers. (October 2, 2016)
  8. Marsland SD, Dawe RA, Kelsall GH (1989) Inorganic chemical souring of oil reservoirs. In SPE International Symposium on Oilfield Chemistry, Society of Petroleum Engineers. (October 2, 2016)
  9. Muthumbi W et al (2001) Microbial sulfate reduction with acetate: process performance and composition of the bacterial communities in the reactor at different salinity levels. Appl Microbiol Biotechnol 55(6):787–793 (October 2, 2016)CrossRefGoogle Scholar
  10. Peters KE, Fowler MG (2002) Applications of petroleum geochemistry to exploration and reservoir management. Org Geochem 33(1):5–36CrossRefGoogle Scholar
  11. Saner S, Abdulghani WM (1995) Lithostratigraphy and depositional environments of the Upper Jurassic Arab-C carbonate and associated Evaporites in the Abqaiq Field, eastern Saudi Arabia. AAPG Bull 79(3):394–409Google Scholar
  12. Teske A et al (1998) Sulfate-reducing bacteria and their activities in cyanobacterial mats of Solar Lake (Sinai, Egypt). Appl Environ Microbiol 64(8):2943–2951 (October 2, 2016)Google Scholar
  13. Vallero MVG, Sipma J, Lettinga G, Lens PNL (2004) High-rate sulfate reduction at high salinity (up to 90 in mesophilic UASB reactors. Biotechnol Bioeng 86(2):226–235 (October 2, 2016)CrossRefGoogle Scholar
  14. Worden RH, Smalley PC (1996) H2S-producing reactions in deep carbonate gas reservoirs: Khuff Formation, Abu Dhabi. Chem Geol 133(1):157–171CrossRefGoogle Scholar
  15. Worden RH, Smalley PC, Oxtoby NH (1995) Gas souring by thermochemical sulfate reduction at 140°C. AAPG Bull 79(6):854–863Google Scholar

Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.Petroleum Engineering DepartmentSemnan UniversitySemnanIran

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