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Analysis of gas composition in Cambrian deposits, revealing unique characteristics in a petroleum-bearing region.
Estimation of reliability of gas composition of stratal waters sampled when testing deep boreholes by various methods has been carried out. Composition of free and water-dissolved gases has been analyzed, with corrections being taken into account. Regularities in changing gas composition have been studied both in section and in area, and composition of water dissolved gases have been mapped for two pools in the Cambrian deposits. Unlike other petroleum-bearing regions in the Lena-Tunguska Province, these gases are characterized by high contents of CO2 and S2O caused by effect of trap intrusions on hydrocarbons, carbonate and sulfate rocks, and organic matter which are part of their composition.
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Filiptsov et al. (1991) studied this question.
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