Three-dimensional numerical modeling of magnetotelluric fields was performed to assess the possibility of separating gas- containing structures from the MTZ method, but overlapped by a series of inhomogeneous high-resistivity layers, which showed that the 1D inversion of the maximal invariant MTZ or quasi-longitudinal curves allows one to map the relief of the overlying high-resistivity layers and low-resistivity faults, bounded arches of structures. The three-dimensional inversion performed on test and field models us- ing the WSINV3DMT program [9] has shown that it is possible to chart the position of the high-resistance gas-condensate deposit when inverting the model and experimental impedance matrix components [Zm] and [Zob].......

The results of experimental studies of the influence of low-temperature technologies used in the production of samples from weakly cemented rocks, on the preservation, bulk characteristics and reservoir properties of samples are described. The analysis of the considered technologies and recommendations on the features of their application are given.......

The study is aimed at the Tournaisian carbonates of the Lower Carboniferous sequence in Bashkortostan. Previous regional research on the petrophysical properties of the Tournaisian sediments revealed that the best reservoirs are associated with fractured- vuggy-porous varieties of the Malevsko-Upinskiy Formation thus provoking special interest to detailed investigation of these deposits. Additional, more thorough, analysis of correlations between petrophysical characteristics of the rocks and their age demonstrated that such correlations may be found only locally and may be nonexistent on the scale of the whole field. The litho-facies model created for the Upper Devonian platform-type sedimentary sequence within Bashkortostan was utilized to provide explanation and further prediction of production potential for the Lower Tournaisian Malevsko-Upinskiy Formation.......

The method of frequency analysis of the three-dimensional distribution of gravitational field anomalies is developed based on the analysis of the materials of the satellite gravimetric monitoring mission GRACE processed by the method of multichannel singular spectral analysis. According to the results of the application of the technique to the gravitational anomalies of the North-Eastern sector of the Pacific Ocean, two areas of the most intense low-frequency variations of the gravitational field are identified. The density sources of area can be due to the neotectonic redistribution of masses in the Eastern end of the Aleutian arc and the Central zone of the San Andreas Fault.......

This article discusses the examples of the applied method of empirical mode decomposition (EMD) aimed at studying the structure of inherently non-stationary potential geophysical fields. Interconnections of the field decompositions' different frequency components (intrinsic mode functions - IMF) and geological and structural oil-and-gas occurrence pre-requisitions in two distant from each other regions of Russia (Komi Republic and Kamchatka region) are traced. It is shown that the behaviour of the field different frequency components used at evaluating «regional» and «local» pre-requisitions of oil-and-gas occurrence is due to the specific features of basement and sedimentary mantle structural and tectonic framework. In particular, it was established that the linear correlation coefficient between the observed magnetic field and combinations of total EMD-components thereof, showing the effect of different depth objects, describes the level of the basement structures succession in the sedimentary mantle. The presented resulting comparison of potential fields profile decomposition through two adaptive algorithms of quantitative interpretation, i.e. EMD and energy filtration, independently shows correctness of the underlying theoretical and methodical approaches.......