Abstract:
© 2019 Elsevier B.V. The influence of the catalyst - the compound of oil-soluble carboxylates of metals: Fe, Co and Cu - on the properties and generation of hydrocarbons from the Domanic carbonate-siliceous rocks of the coeval sediments of the Semiluki horizon of the Romashkino and Pervomaisky oil fields located in the central and north-eastern part of Tatarstan was investigated. Experiments were carried out at the temperature 300 °C, during steam-thermal effect in CO2 environment. Rocks differ in their carbonate and siliceous content, the content of kerogen and dispersed organic matter, group and structural group composition of the selected extracts, which is due to the different conditions of formation of thicknesses. Due to the processes of destruction of high molecular components and insoluble kerogen structure, the presence of metal catalyst in the reaction system increases the yield of extracts from rocks: 12 times in the rock's sample from Romashkino field and 2 times in the rock's sample of Pervomaisky field, in which the content of saturated hydrocarbons increases: 6 and 1.5 times respectively. The features of the structural-group composition and paramagnetic properties of asphaltenes and carbene-carboids, formed in the process of catalytic experiments, due to the different content of kerogen and high-molecular organic matter in the initial rocks are revealed. Peculiarities in the composition and distribution of microelements in the studied rocks before and after catalytic experiments were revealed. A high sorption capacity of the rock to the metals that included in the compound of the used catalysts was identified.
