Nader, A.F. , Muhammad, R.J., Saleh, W.M. , Abdullah, M.S. and Atwan, A.Q. 2022. Evaluation of Main Pay- Zubair Formation after Operations Re-Injection of Produced Water Directly In Rumaila Oil Field Norths under Matrix Condition. Journal of Petroleum Research and Studies. 12, 2 (Jun. 2022), 13-36. DOI:https://doi.org/10.52716/jprs.v12i2.655.