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Date submitted2019-01-17
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Date accepted2019-03-05
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Date published2019-06-25
Geological and geomechanical model of the Verkhnekamsk potash deposit site
- Authors:
- Yu. A. Kashnikov
- A. O. Ermashov
- A. A. Efimov
Major accidents at OJSC Uralkali raised the question of the need for a detailed study of the geological structure of the Verkhnekamskoye potassium salt deposit, the identification of anomalous complex zones in the oversalt rocks and, above all, in the water-blocking layer (WBL). The article proposes a method for isolating weakened zones in the WBL and potash reservoirs, based on the combined use of geomechanical (laboratory core tests) and geophysical (acoustic broadband logging in wells and surface seismic exploration) studies. It also describes the method of zoning of WBLand potash reservoirs on the physical and mechanical properties to obtain their specific values. This technique will help solve the most urgent problem of ensuring industrial safety in the development of the Verkhnekamskoye potassium salt deposit (the safety of the WBL). The implementation of the proposed method is considered for the Romanovsky site of the Verkhnekamskoye deposits of potassium and magnesium salts. The research included 2D seismic explorations, physical and mechanical properties testing, and finding statistical dependencies between static and dynamic geomechanical parameters. Based on the processing of seismic materials and the obtained dependencies, a geological and geomechanical model of this area was created, and zones with different physicomechanical properties were identified.
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Date submitted2015-08-21
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Date accepted2015-10-24
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Date published2016-04-22
Results of the 5G borehole drilling at russian antarctic station «Vostok» and researches of ice cores
- Authors:
- N. I. Vasilev
- A. N. Dmitriev
- V. Ya. Lipenkov
We produce an information about results and features of the 5G borehole drilling in Antarctic layer at Russian station Vostok. Main regularities of the change structured and physical properties by Antarctic ice layer depth, which determine mechanical and reological properties if ice, which influence to sinking of a borehole and to the maintaining of it in a working condition, the safe and competitive technologies creation for drilling of strong ice layers and the environmentally safe technology of the subglacial reservoirs unsealing. We also produce results of the ice cores researching and the paleoclimatic raws construction, which are reconstructed by the ice cores researching from Vostok station, which is compared with isotopic graph. This graph describes changes of World ocean level.
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Date submitted2015-07-14
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Date accepted2015-09-09
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Date published2016-02-24
Engineering and geomechanical forecast for waste disposal in underground caverns including earthquake-prone zones
- Authors:
- O. V. Kovalev
The article aims at obtaining representative scientifically based data to determine parameters of a necessary-safe condition of the rock massif (RM) in underground waste diposal caverns zones, including earthquake-prone zones. The main requirements for underground caverns for hazardous waste disposal and for their construction technology are described. The subject of the research is underground solution caverns in halogen rocks. Data for justification of safe waste disposal conditions in underground salt caverns and its stages are presented. A complex approach to the solution of the research problem is described. The main aspects of dynamic influence of seismic waves on underground caverns stability are considered. Taking into account seismic-risk zoning data on the research region some significant parameters of a possible seismic impact on the experimental cavern are calculated. The article points out the necessity of superincumbent rock and surface displacement assessment for the experimental site zone using the suggested complex approach and including the analysis of surveying data and results of rock mass geomechanical modeling.
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Date submitted2010-07-23
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Date accepted2010-09-18
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Date published2011-03-21
Amplitude-phase correction of additional MT impedance curves for two dimensional structures
- Authors:
- E. Yu. Ermolin
The regularities of the amplitudes and phases connections of MT-impedance tensor components for 2D geoelectrical synthetic models have been considered. The amplitude-phase correction (APC) allows to improve the quality of data processing results both for the main and for the additional impedances. It also gives a possibility to suppress biased data for noise pollution data. Recommendations on accuracy rising of determination of tensor impedance components in the MT-data processing have been defined on the base of found regularities.