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Vol. 6 (2003 year), No. 1
Kalashnik A.I., Savchenko S.N., Panin V.I., Kaspar'yan E.V. and Smirnova O.V.
Methodical approaches to geomechanical processes research of gas-oil deposits of the Barents Sea shelf
Methodical approaches have been stated considering the shelf gas-oil structure as an integrated geological object being an open dynamic nonlinear natural and engineering system. Mathematical methods for modeling gas-oil shelf structures have been developed taking into account the sea shelf geological structure properties, gas-oil deposits specifics as well as the main processes at their development and exploitation. Multivariant mathematical modeling has been carried out for an integrated geological object - gas-condensate field. The structure of geomechanical monitoring has been developed over the geological environment of the whole region, where the construction of this industry corresponding facilities and long pipelines is planned. Methodology has been developed for structuring geomechanical and geophysical data being the background for geological and geomechanical data bases on more than 130 gas-oil fields and perspective marine shelf provinces in the Barents region.
(in Russian, стр.8, fig. 3, tables. 0, ref 11, MS Word 95, MS Word 95 104 Kb)
Vol. 10 (2007 year), No. 2
Savchenko S.N., Kozyrev A.A.
A comparative analysis of the rock stressed state in the sections of SG-3 and KTB superdeep wells and in their vicinities
We have reported here temperature dependence of electrical resistivity, heat capacity of natural tremolite up to 1300 K for the first time. The samples used in the present study, are natural tremolites from the core samples of the Kola Superdeep well (SG-3) from the depth of 12148 meters and a surface sample from Idegondanahalli, Karnataka, India. Both samples have witnessed identical peak metamorphic conditions. The electrical resistivity of the tremolite from the SG-3 is found to be 1.02?1011 Ohm.cm at 415 K, and decreases exponentially with the increase of temperature up to 903 K, where the electrical resistivity increases from 1.412?106 Ohm.cm to 3.158?107 Ohm.cm. The transition is interpreted as thermally induced decomposition of tremolite, as the transition in the temperature range 903 K to 963 K is found to be irreversible in their electrical resistivity behaviour. This phase transition is also observed at 1050 K in differential thermal analysis (DTA). Temperature dependence of heat capacity of tremolite up to 1300 K also confirmed the phase transition. The phase transition observed in the SG-3 sample has been compared with the thermal behaviour of a surface sample of tremolite from Idegondanahalli.
(in Russian, стр.5, fig. 4, tables. 0, ref 7, Adobe PDF, Adobe PDF 0 Kb)
Vol. 12 (2009 year), No. 3
Korsakova O.P., Kolka V.V., Savchenko S.N.
Block structures of the Kola Peninsula, their resistance under the conditions of natural and technical systems (by the example of the Khibiny and Lovozero Mountains)
The paper presents the results of comprehensive geological and petrographic, isotope geochemical (U-Pb, Sm-Nd, REE) and geochemical exploring investigations of the Monchetundra intrusion rocks. The studied cumulative stratigraphy for the intrusive rocks forms the basis for the division of the vertical rock sequence into three zones. The lower zone is dominated with orthopyroxene and olivine cumulates. The middle zone consists of pyroxene-plagioclase and plagioclase cumulates. And the upper one is mainly composed of plagioclase cumulates. The internal structure of the intrusion displays the lateral increase in differentiation degree from the eastern flank southwards (for the lower zone) and westwards (for the middle and upper zones). A new manifestation of noble metal stratiform mineralization has been found. It is confined to the horizon of the trachitoid gabbronorite (the middle zone). The mineralization locates in the western part of the intrusion that readily agrees with internal structure. The U-Pb dating has allowed revealing two intrusive phases for the rocks of the upper part: an earlier, 2.47 Ga, and an older, 2.45 Ga, one. The initial magma for the rocks of the middle and upper zones has been found to differ. The initial magma for the rocks of the lower zone of the Monchetundra intrusion was slightly enriched both with light and heavy rare earth elements. The rocks of the middle and upper zones were formed of the primary melts that were close in composition being slightly enriched with LREE. The differences in the REE fractionation have been shown for the different zones of the intrusion, including the initial magma close in composition that yielded the rocks of the middle and upper zones of the intrusion in the course of differentiation and crystallization. Thus, the REE fractionation coefficient, (La/Yb)N directly correlates with the content of Al2O3, CaO, total and particular iron content in the rocks of the upper zone, that is not characteristic of the middle zone rocks. It has been concluded that the collected data on REE, and U-Pb and Sm-Nd isotopy assume the formation of the Monchetundra intrusion as a result of subsequent emplacement, differentiation, and crystallization of the melts from the single anomalous source with possible minor contribution from the depleted source.
(in Russian, стр.14, fig. 9, tables. 0, ref 18, Adobe PDF, Adobe PDF 0 Kb)
Vol. 14 (2011 year), No. 3
Kozyrev A.A., Kalashnik A.I., Kaspar'yan E.V., Savchenko S.N.
Conception of organization of geodynamic monitoring of oil and gas facilities of the Western sector of Russian Arctic
Oil and gas facilities are quite complicated and critical facilities which safety and efficiency should be provided for a long-term period. The peculiarities of oil and gas facilities construction and operation under complicated geodynamic conditions have been considered. The basic principles of organization of geodynamic monitoring of geological environment state connected with oil and gas complex construction have been formulated. Methodics of geodetic observations and mathematical justification of observation sites location plan have been proposed. Geophysical methods – seismic tomography and georadar profiling – give significant addition to the observation systems as a whole. The system of geodynamic monitoring along oil and gas main pipelines on the territory of the Kola Peninsula has been proposed.
(in Russian, стр.14, fig. 11, tables. 1, ref 10, Adobe PDF, Adobe PDF 0 Kb)
Vol. 16 (2013 year), No. 4
Lovchikov A.V., Savchenko S.N.
Stress state of rocks near stope in the "Karnasurt" mine
The stress state of stope workings of the "Karnasurt" mine has been studied using numerical modelling. The "Karnasurt" mine develops thin flat-dipping ore deposits by systems with open stoping and without failures and flushing of workings. Modelling has been carried out under gravitational and gravity-tectonic stress state of the rock mass. It has been established that stability of the large-span stope workings is provided, mainly, due to action of large tectonic stresses of subhorizontal direction.
(in Russian, стр.7, fig. 6, tables. 1, ref 6, Adobe PDF, Adobe PDF 0 Kb)
Vol. 16 (2013 year), No. 4
Savchenko S.N.
Some possible scenarios of the two-parameter dynamic system evolution
Interrelation of two leading parameters of a dynamic system in evolution has been considered. Homogeneous system of first-order differential equations with two unknown functions has been solved for some special cases of time-varying equation coefficients. Physical interpretation of the examples considered has been presented. It has been determined that a character of change for the leading parameters of the dynamic system depends on a type of functions-coefficients composing the differential equation system. If one function is proportional to another one, a concerted change of the leading parameters in time is observed. If the functions are different, both concerted and non-concerted change of the dynamic system parameters is possible.
(in Russian, стр.4, fig. 6, tables. 0, ref 3, Adobe PDF, Adobe PDF 0 Kb)