DOI: 10.7256/2453-8922.2023.1.40378

Abstract: The subject of the study of the proposed article is the gas component of the cryolithozone. If the solid and liquid phases of frozen rocks have been studied sufficiently deeply and systematically, then the gas component has been studied weakly and fragmentally. The object of the study is gas-saturated frozen soils, their spatial distribution and properties. Studies of recent decades have shown that the gas component plays a significant role in the structure and properties of frozen rocks. The author examines in detail such aspects of the topic as the effect of gas on the physical and mechanical properties of both thawed and frozen soils. Special attention is paid to the overlap of capillaries in the soil with gas, an increase in pore pressure, a weakening of soil consolidation and connections between soil particles. This, in turn, is expressed in a decrease in strength and density while increasing compressibility and porosity.      The novelty of the study lies in the fact that for the first time a comparative analysis of data on the content of the gas component of the pressure in it and the processes occurring in frozen rocks was carried out. A special contribution of the author to the study of the topic is that the influence of free gas on their physical and mechanical properties is shown. The relevance of the topic under consideration is due to the need to study the patterns of deformation of frozen rocks depending on the degree of gas saturation. The article analyzes the state of the regulatory framework that takes into account the influence of gases on strength and deformative properties. Their almost complete absence was recorded. The importance of taking into account the possible increased pressure in gas-saturated frozen rocks in the development of research methods and regulatory documents for their use in engineering-geological and design work is shown. The materials considered indicate that gas-saturated frozen soils are a significant and important part of the cryolithozone and their study should be carried out within the framework of an independent section of geocryology.

DOI: 10.7256/2453-8922.2021.3.35505

Abstract: The subject of this research is frozen rocks that compose gas emission funnels in the north of Western Siberia. The object of this research is the cryogenic factor that causes the formation of gas emission funnels. The authors substantiate the thesis that gas emission funnels are cryogenic phenomenon, and the processes preparing the explosion cannot be accurately interpreted without taking these features into account. The analysis of research materials on gas emission funnels, discovered in the north of Western Siberia, allows concluding that surface conditions may have a significant impact upon the formation of gas emission funnels. Special attention is given to consideration of the hypothesis of formation of gas emission funnels due to local heat penetration and gas supply from the depth. The necessary conditions are described. The article provides the examples of using geophysical methods for detecting of gas supply channels. It is concluded that gas emission funnels are the result of self-development of fluid-dynamic geosystems, which represent local, ice subsurface gas-saturated formations that are in a inequilibrium thermodynamic state with respect to the enclosing permafrost formations. The authors' special contribution consists in examination of the external and hidden mechanisms of the emergence of inequilibrium conditions od the mechanism that launches an explosion. The novelty of this research lies in the development of technique for determining the processes that cause the emission of underground gas, based on the analysis of cryogenic formations, which compose the walls of gas emission funnels.

DOI: 10.7256/2453-8922.2020.2.32698

Abstract: The object of this study is the geosystems of gas-saturated permafrost. Currently, the theoretical basis for examination of gas component in permafrost is practically not developed. At the same time, the theoretical and practical significance of this problem has rapidly increased in recent years. This is due to gas emissions during drilling of wells in frozen rocks, the identification of significant greenhouse gas emissions in the Arctic, the detection of previously unknown processes in the permafrost zone – the formation of craters due to gas emissions.The main method applied in the article is the analysis of research materials. The synthesis of the results was carried out on the basis of the geosystem approach. The authors are first to demonstrate that gas-saturated zones in seasonally and permafrost rocks have all the attributes of geosystems: localization in space, boundaries, morphology, individual structure and properties, development history, life cycle, hierarchy. Five types of geosystem were determined: active layer; genetic type; confined to geological structures; secondary, associated with the decomposition of gas hydrates in vivo; technogenic (due to thermal or mechanical effects on hydrated and gas saturated frozen rocks). The artcile describes promising directions in studying gas-saturated geosystems of permafrost zone, as well as  the advanced research methods.

DOI: 10.7256/2453-8922.2019.4.30997

Abstract: The subject of this research is gas filtration in frozen rocks. For the first time, in laboratory conditions, it was possible to identify the processes that accompany gas filtration in frozen ground. Particular attention is paid to the study of deformations of primary cryogenic textures during filtration of gas under pressure. The features of the propagation of gas fluids in a frozen sample are analyzed. A comparative analysis of the cryogenic structure of frozen samples with and without gas supply has been carried out. The mechanism of pressure filtration of gas in frozen rocks is formulated. When studying frozen ground samples subjected to pressure gas, we used the methods of texture and structural studies in transmitted, reflected and polarized light. To identify changes occurring in frozen samples under pressure from gas, a comparative analysis method was used. At the same pressure, at low temperatures of the samples, filtration does not occur. Filtering begins when the temperature rises to -1 - -2 ºС. In nature, these relationships are determined by geological, landscape, and climatic conditions. For the first time, in laboratory conditions, with the help of structural studies, it was possible to identify the processes accompanying gas filtration in ice.

DOI: 10.7256/2453-8922.2019.3.29627

Abstract: The object of this research is the problem of gas filtration in permafrost formations. Currently, geocryology identifies the movement capability of gas fluids is only within the thawed formations. The subject of this study is the processes substantiating and accompanying redistribution of gas in the gas emission craters, as well as in the samples of artificial ice exposed to gas pressure. The authors examine the summarized data on the structure of craters and conditions for their emergence such as: the zones of accumulation of subterranean gas with abnormally high pressure in the permafrost strata; filtration of gas into high-temperature frozen rocks and subsurface ice; formation of gas-saturated ice soil rods and their explosive destruction. Particular attention is turned to the laboratory examination of gas filtration in frozen rocks and ice. The main research method became the comparative data analysis on the changes of properties of the frozen soils and ice as they war up within negative temperatures. Exploring the samples of ice exposed to gas pressure, the authors apply the methods of textural and structural studies in the passing, reflected and polarize light. It is established that the frozen rocks and subsurface ice allow gas filtration in the conditions of forming the corresponding ratio of characteristics of the rocks (strength, deformative, structural) that depend on their temperature and pressure of the underlying soil gas. It is revealed that the aforementioned ratio is determined by the geological, landscape and climatic conditions. With the help of structural studies, the authors are first to describe the processes accompanying gas filtration within ice in the laboratory conditions.