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Arabian Journal of Geosciences

, 11:552 | Cite as

Salinity mapping model and brine chemistry of Mishrif reservoir in Basrah oilfields, Southern Iraq

  • Salih Muhammad Awadh
  • Heba S. Al-Mimar
  • Abdullah A. Al-Yaseri
Original Paper
  • 29 Downloads

Abstract

Cation and anion concentrations and boron isotopic ratio of brines in the Mishrif Formation (U. Campanian-Tuoronian) from North Rumaila, South Rumaila, Majnoon, Zubair, and West Qurna oilfields southern Iraq were investigated. The aims of this study are to define the type, origin of the oilfield waters, and its flow model in the subsurface oil traps. Mishrif brines are characterized by having higher concentrations of sodium (50,500–84,200 ppm), chlorine (102,100–161,500 ppm), and boron (21.9–31.1 ppm) with lower sulfate contents (187–1350 ppm) relative to the modern seawater. Samples have slightly depleted in δ 11B (35.4‰) relative to seawater fall near the seawater intrusion of the diagram Cl/Br Vs δ 11B and occupied the field of evaporated seawater on the diagrams of Cl vs B and 1/Br vs δ 11B. The brine of Na-chloride type is characteristics of the Mishrif reservoir in all oilfields except WQ which defined by facies of Na-Ca-chloride type. A weak acidic brine of a salinity six-time greater than seawater plays a role in generating the formation pressure and controlling the fluid flow. The reservoir rock-fluid interactions were interpreted using boron isotopes which eventually reveal an ongoing dilution process by the present seawater intrusion and injection water used for the secondary production under conditions of high-temperature digenetic reactions. The 11B in the oilfield water is resulted from uptake of the tetrahedral borate after precipitation of calcium carbonate, while 10B is sourced from the thermal maturation of organic matters.

Keywords

Potential mapping Salinity Boron isotopes Mishrif reservoir Oilfield water 

Notes

Acknowledgements

We are grateful to the South Oil Company for providing us with the oilfield water samples and necessary pressure and temperature values. Our thanks also send to the staff of the ALS laboratory group in Spain and Sweden for conducting the chemical analysis of oilfield waters and boron isotopes, respectively.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Salih Muhammad Awadh
    • 1
  • Heba S. Al-Mimar
    • 1
  • Abdullah A. Al-Yaseri
    • 2
  1. 1.Department of Geology, College of ScienceUniversity of BaghdadBaghdadIraq
  2. 2.South Oil CompanyBasrahIraq

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