Kuspanova, B. 2011. Prediction of oil reserves in wells on the basis of studying the content of vanadium (IV) and bivalent manganese Mn2+ in rocks. Chemical Bulletin of Kazakh National University. 64, 4 (Dec. 2011), 157-162. DOI:https://doi.org/https://doi.org/10.15328/chemb_2011_4157-162.