The paper presents the results of a study of the chemical composition of the formation waters of the Lower Cretaceous, Jurassic and Paleozoic deposits of two oil fields of the Krasnoleninsky dome of Western Siberia. It is shown that the content of barium in formation waters of the fields is 35–78 mg/dm3, which is an order of magnitude higher than its content in most reservoir brines with a mineralization of about 80 to 260 g/dm3, while the mineralization of the studied reservoir waters does not exceed 16–18 g/dm3. In the waters of the rocks of the Jurassic age, an advancing accumulation of barium was noted, in relation to strontium and almost equal to the calcium content, which was reflected in the Ca:Sr:Ba ratio, which was 100:10:100, while for most reservoir brines and ocean water this ratio is 100:10:0.01. Such an anomalously high content of barium in relation to the salinity of formation waters can be explained by its entry into the sedimentation basin as part of deep thermal waters.
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