Abstract
The model experiments regarding the conversion of organic matters from carbonate rock samples of Dankov-Lebedyan deposits of Zelenogorskaya area and siliceous-carbonate rocks of Semiluki-Mendym deposits of Berezovskaya area of Domanic formations of Romashkino oil field were carried out. Two types of experiments were carried out: (1) the hydrothermal treatment of rocks at a temperature of 350°C in the presence of carbonic acid and a water content of 30%; (2) pyrolysis at temperatures of 350 and 600°C in the presence of hydrogen. The yield and quality of extracted hydrocarbons from the rocks depending on the mineral composition of rocks, content and composition of organic matter, and thermal stability of kerogen under hydrothermal influences were evaluated. Application of electron paramagnetic resonance in pyrolysis processes revealed the difference in mineral content of rocks (Mn2+, SO3−, and SO2− ions) and free radicals R∗, as well as in vanadyl ion (VO2+) concentration. It is established that an increasing temperature of pyrolysis promotes the formation of new free organic radicals in rock samples: in Domanic rocks of Semiluki-Mendym deposits at 350°С and in carbonate rocks of Dankov-Lebedyan horizon at 600°С. This indicates different ability of oil-generating potential of rocks with hydrothermal and pyrolysis technologies.
Highlights
The increased interest in high-carbon rocks, which are rich in organic matter (OM), is associated with their reserves and perspectives of shale oil production [1,2,3,4,5]
In the territory of Tatarstan, the Domanic formations are represented by typical domanicites with an organic content of Corg. 5– 20% in Semiluki, Mendym, and Sargai horizons, as well as domanicoids starting from Tournaisian age up till Mendym horizon with an organic content of Corg 0.5–5%
The investigated samples of rocks differ in mass loss with an increase in temperature from 20 to 900°C and the presence of thermal effects associated with the decomposition of organic matter in rocks and the dissociation of carbonate minerals
Summary
The increased interest in high-carbon rocks, which are rich in organic matter (OM), is associated with their reserves and perspectives of shale oil production [1,2,3,4,5]. In the territory of Tatarstan, the Domanic formations are represented by typical domanicites with an organic content of Corg. Kerogen is a nonsoluble part of organic matter, which contains mainly chemically strongly connected polymer components inside the rocks. These components are converted into hydrocarbons only under the temperatures of not less than 100°С [6,7,8,9,10].
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