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Shevnin V.A.,Moscow State University | Ryzhov A.,All Russia Research Institute of Hydrogeology and Engineering Geology
Geophysics 2015 - 11th EAGE International Scientific and Practical Conference and Exhibition on Engineering and Mining Geophysics | Year: 2015

A possible origin of increased polarizability of fluvioglacial sand in aeration zone is considered, and we found that it is resulred in some depth interval where weighting humidity is equal 2-5% at transition from very dry sand near the surface to full saturation of depth. Source

Yusupova I.F.,All Russia Research Institute of Hydrogeology and Engineering Geology
Solid Fuel Chemistry | Year: 2011

Consequences of heat generation caused by exothermic changes in organic matter in the subsurface have been considered. It has been shown that once existed deposits containing solid organic matter and then self-heated, spontaneously ignited, and burnt under subsurface conditions can be traced by not only thermally altered rocks (including ore mineralization, etc.), but also landforms (positive and negative) and increased levels of both dislocations and geofiltration heterogeneity. Elevated temperatures (sometimes up to 1000-1200°C), causing transformation of both organic and mineral matter, create preconditions for deformation of host rocks: void emptying due to loss of a large mass (more precisely, volume) of matter (mainly organic), explosive activity of generated fluids, and the corrosive nature of some of them. As a result, the bed integrity is disturbed, stockwork fracturing (and permeability) develops, and rocks are subjected to impact of corrosive solutions. The role of solid organic matter in the disintegration of rocks has been analyzed. It has been pointed out that not only high temperatures can cause deformation alteration of rocks, but also dislocating nature of the environment can cause heat generation. In any case, there will be spatial alignment of both thermally altered and dislocated rocks. © Allerton Press, Inc., 2011. Source

Shevnin V.A.,Moscow State University | Ryjov A.A.,All Russia Research Institute of Hydrogeology and Engineering Geology | Kvon D.A.,Moscow State University
12th Conference and Exhibition Engineering Geophysics 2016 | Year: 2016

In induced polarization method two parameters are measured: resistivity and chargeability. We used frequency-domain IP measurements as IP profiling and spectral characteristics (ηa from frequency). Chargeability was determined from phase difference, from PFE and LFE. Additionally we calculated normalized chargeability Mn. At IP profiling ηa values determined from Δφ, PFE and LFE are very similar, while at spectral characteristics these are different in frequency. Mn parameter is closely correlated with superficial conductivity, proportional to clay content and inversely proportional to hydraulic conductivity. Some examples of field data are presented and discussed. Source

Drozdov D.S.,Russian Academy of Sciences | Ukraintseva N.G.,Russian Academy of Sciences | Tsarev A.M.,Russian Academy of Sciences | Chekrygina S.N.,All Russia Research Institute of Hydrogeology and Engineering Geology
Earth's Cryosphere | Year: 2010

The results of the long-term regime observations of the permafrost temperature and state of geosystem on the Urengoy oil-gas-field territory are presented. The observations were conducted at key-sites equipped in 1974 in the landscape sub-zones of the southern forest-tundra and southern tundra. The positive temperature trend during the period of 1974-2008 has been generally confirmed everywhere; however the temperature increase was uneven both in time and in space. The cycles of warming-cooling have been revealed. In southern foresttundra, the descending of the permafrost table has been widely observed. The permafrost dynamic maps of the research territory have been created using the geo-information technologies. The 30-40 km advance of the boundary of the scattered trees to the north is one of the obvious landscape indicators of climate warming. Source

Abukova L.A.,Russian Academy of Sciences | Yusupova I.F.,All Russia Research Institute of Hydrogeology and Engineering Geology | Abramova O.P.,Russian Academy of Sciences
Solid Fuel Chemistry | Year: 2014

The role of an important bulk component of high-carbon rocks (in particular, oil shale) - their concentrated organic matter (COM) - in the formation of epigenetic permeability is considered. Baltic kukersite shale (degree of transformation - early catagenesis) is used as an example. It is emphasized that the fluid permeability of this shale layer is manifested locally in tectonic disturbances, buried erosional valleys, and linear structural-deformation zones. The quality of shale in these zones deteriorates (the calorific value, the yield of tar, etc., decrease), and it is partially decarbonized (and decarbonated) and deformed; the shale acquires increased permeability, and its bed thickness decreases and marl varieties become more terrigenous. It is asserted that these phenomena were caused by the partial (and sometimes almost complete) loss of kukersite in the test sections of COM. The decrease of the organic matter caused the liberation of void space and then deformations, the disturbance of the integrity of layers, an increase in the permeability, and the loss of the status of fuels by the initial shale. The relationship of the degradation of the COM of shale with sulfate reduction processes in the underground hydrosphere at the early catagenic stage of the existence of a shale layer is substantiated. © 2014 Allerton Press, Inc. Source

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