Ha Thu , H., Kieu Anh , T., Nguyen Minh , Q., Hoang , L., Le Thi Thu , H. and Tran Van , L. 2017. Application of geochemical technique to reduce allocation cost for commingled production wells from multiple reservoirs. Petrovietnam Journal. 10, (Oct. 2017), 45 - 50. DOI:https://doi.org/10.25073/petrovietnam journal.v10i0.233.