Mining Institute of the Ural Branch of the Russian Academy of Sciences, Perm, Russia

S. S. Andreiko, Head of laboratory, Professor, Doctor of Engineering Sciences
I. I. Chaikovskiy, Head of laboratory, Professor, Doctor of Geological and Mineralogical Sciences
E. A. Nesterov, Senior Researcher, Candidate of Engineering Sciences
A. S. Papulov, Engineer, aspapulov@gmail.com

Within the mine fields of the Upper Kama potash salt deposit, there are areas where the structure of the productive strata AB, namely, the stratum B, is represented by variegated silvinites, carnallites and mixed salts (silvinite + carnallite). The article substantiates the need to study the gas content of mixed salts. The places where in-situ experimental research of gas content of salt rocks in terms free gases were carried out are presented. The experimental research included the instrumental observations of gas emissions from boreholes drilled in roadways with sampling of free gas to determine its component composition, and qualitative and quantitative characteristics were obtained. The results of the laboratory studies into the gas content of rocks represented by variegated silvinite and carnallite from the seam B, obtained from measurements of gas volume released during dry mechanical disintegration of rock samples with the constant pressure and temperature control in an air-sealed vessel, as well as from sampling and chromatographic analysis of the component composition of gases, are presented. Statistical processing of the in-situ research data on the gas content of the mixed-composition stratum B was performed. Based on the processing outcome, it can be stated with a probability of 0.95 that in terms of the free gas content, which is the main factor of the gas dynamic activity of rocks, there are no significant differences between the rocks of stratum B of mixed and silvinite composition.
The study was supported by the Russian Foundation for Basic Research, Project No. 20-45-596017r_NOC_Permskii krai.

1. Xiangjun Chen, Liyang Li, Lin Wang, Lingling Qi. The current situation and prevention and control countermeasures for typical dynamic disasters in kilometer-deep mines in China. Safety Science. 2019. Vol. 115, Iss. 16. pp. 229–236.
2. Ruiqin Li, Chenglin Liu, Pengcheng Jiao, Wanping Liu, Deguo Tang et al. The effect of solvent chemistry on potassium dissolution extraction from low-grade solid potash ore in Qarhan Salt Lake, China. Applied Geochemistry. 2020. Vol. 115. DOI: 10.1016/j.apgeochem.2020.104550
3. Bobrov D. A., Litvinovskaya N. A., Nesterov E. A. Gas content and gas-dynamic characteristics of rocks of the IV-p horizon of the Starobin deposit of potash salts. IOP Conference Series: Earth and Environmental Science. 2022. Vol. 1021. DOI: 10.1088/1755-1315/1021/1/012056
4. Kamnev E. N., Morozov V. N., Tatarinov V. N., Kaftan V. I. Geodynamic aspects of investigations in underground research laboratory (Nizhnekansk Massif). Eurasian Mining. 2018. No. 2. pp. 11–14
5. Zemskov A. N., Kondrashev P. I., Travnikova L. G. Natural Potash Gases and Preventions. Perm, 2008. 413 p.
6. Zimmer M., Strauch B., Zirkler A., Niedermann S., Vieth-Hillebrand A. Origin and evolution of gas in salt beds of a potash mine. Advances in Geosciences. 2020. Vol. 54. pp. 15–21.
7. Siemann M. G., Ellendorff B. The composition of gases in fluid inclusions of late Permian (Zechstein) marine evaporites in Northern Germany. Chemical Geology. 2001. Vol. 173, No. 1-3. pp. 31–44.
8. Andreiko S. S., Kalugin P. A., Shcherba V. Ya. Gas Dynamic Phenomena in Potash Mines: Genesis, Prediction and Control. Moscow : Vysshaya shkola, 2000. 335 p.
9. Lyadov V. O., Papulov A. S. Results of studies on the full gas content in rocks of the productive formation of the Gremyachinsk potash salt deposit. Problemy nedropolzovaniya. 2023. No. 2(37). pp. 99–111.
10. Andreyko S. S., Ivanov O. V., Lyalina T. A., Nesterov E. A. Free gas content of the rocks of the silvinite and silvinite-carnallite zones at the Upper Kama districts. Gornaya promyshlennost. 2021. No. 4. pp. 125–133.
11. Ivanov O. V. Procedure and data of gas content determination in salt rocks in terms of bound gases by dry mechanical disintegration method. Strategy and Processes of Development of Georesources : Collection of Scientific Papers. Perm : GI UrO RAN, 2016. Vol. 14. pp. 312–314.
12. Ivanov O. V. Gas content assessment in salt rocks using core samples from geological exploration wells on the East Talitsa site at the Upper Kama salt deposit. Gornoe ekho. 2022. No. 3(88). pp. 68–74.
13. Ivanov A. A., Voronova M. L. Upper Kama potash salt deposit (stratigraphy, mineralogy and petrography, tectonics, genesis). Leningrad : Nedra, 1975. 217 p.
14. Ryzhov P. A. Mathematical statistics in mining : Tutorial. Moscow : Vysshaya shkola, 1973. 287 p.
15. Huber P. J. Robust Statistics. International Encyclopedia of Statistical Science. Berlin : Springer, 2011. pp. 1248–1251.
16. Latyshev O. G., Kazak O. O. Mathematical methods in mining : Textbook. Vologda : Infra-Inzheneriya, 2022. 172 p.
17. Andreyko S. S., Nesterov E. A., Bobrov D. A. Models of the degassing mechanism of mixed composition layer B in the conditions of the Verkhnekamskoe potash deposit. Izvestiya Tulskogo gosudarstvennogo universiteta. Nauki o Zemle. 2023. No. 1. pp. 507–514.