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Abandoned oil and natural gas wells can pose a serious risk, mainly associated with uncontrolled oil spills and natural gas leakage due to imperfect sealing. In order to make the right decision for the need for repeated disposition of borehole, it is essential to have a functional, general, but sufficiently simple method of risk assessment. Certified methods for risk analyses used by Czech governmental institutions as well as other open methods available in literature were analysed and significant gaps recognised,...

This paper reviews the main transborder issues on the territory of Commonwealth of Independent States (former USSR) of principally associated with natural and human induced hazards involving waste contamination from extractive industries. The Soviet Union included 15 states that had unified political and economic system. In 1991, after the collapse of the USSR, on the territory of the previously united country, were formed 15 independent states, respectively new boundaries were shaped, and existing environmental p...

The paper considers the main natural and technogenic factors forming the ecological state of the underground space and its influence on the long-term stability of buildings in such megalopolises as Saint Petersburg. Various contamination sources of Saint Petersburg underground environment, including sandy-clayey sediments, groundwater, gases of different genesis, microorganisms, as well as above-ground and underground structures, are analysed. Peculiar natural and technogenic processes, which activation or develop...

Heavy metal contamination of soils is a long-standing environmental problem in the world due to the increase of anthropogenic impact on landscapes. The proposed paper is the first step of an integrated ecological and geochemical investigation of soil cover of the Baikal region. Study object is the biggest island of the Lake Baikal named Olkhon, which is a part of the Baikal National Park, Russia. The study was performed by the key-site method. The method is based on the revealing an index plot, which characterizes...

The paper considers main factors of oil hydrocarbons transformation and migration in underground medium. Influence of oil products on changes in redox and acid-alkaline conditions of underground space, as well as on intensification of various forms of microorganisms is shown. Composition and physical-mechanical properties transformation of disperse soils with different water saturation levels are experimentally studied. Failure causes of residual fuel oil storage are analysed. Role of microbial activity in formati...