Issues of the journals Геофизика 2014 y. issue 1

Mathematical modeling C-effect and P-effect in the methods of apparent resistance in electrical survey

(Karinskiy A.D. Daev D.S. Mazitova I.K. )

Mathematical modeling results of some problems of near surface electrical prospecting are described In the paper. New approach to solution of problem, based on the approximate theory, presented in author s works, was used for it. Within the limits of this theory, secondary field, created by rather small isometric volume dV of media with electrical parameters different from surrounding rocks, can be approximated by fields of alternating electric and magnetic dipoles (alternating EM field) or electric dipole (stationary field). Approximate theory was used for study with mathematical modeling of near surface media heterogeneities influence on the apparent resistivity methods results. Such distortions of electrical sounding and electrical profiling data called С-effect and Р-effect.......

  • 2014  № 1, pp. 36-45

Kerogen volume estimation in bazhen' formation by gamma-ray log data taking into account sedimentation cycles

(Srebrodolskaya M.A. Kosterina V.A. Zoloeva G.M. )

Method of gamma-ray log data interpretation for kerogen (organic material) volume estimation in source rock deposits (taking into consideration Bazhen formation’ cyclic structure) is proposed. Introduced gamma-ray log data interpretation method is reported to increase accuracy of kerogen volume approximately in two times. Correct accountancy of kerogen contribution into the total hydrogen index value determined by neutron methods result in more verifiable total & open porosity coefficients estimation and consequently in more accurate reservoir highlighting in Bazhen formation’ deposits and more reliable hydrocarbon reserves estimation.......

  • 2014  № 1, pp. 46-52

Geoelectrochemical researches of a physical and chemical situation of nadproduktivny deposits

(Shigaev V.Yu. Volkova E.N. Averchenkova E.V. )

The results of geo-electro-chemical research, focused on the study of violation of physical and chemical conditions In the nadproduktivnyh deposits Volnovskoe oil field. The summary data shows that annular abnormality of complex physicochemical parameter must take place bordering the oilfield. This allows authors to say about new indication to predict the petroleum potential of local objects.......

  • 2014  № 1, pp. 53-56

Influence of moisture content on elastic wave velocities in clay soils

(Pioro E.V. Oshkin A.N. Tyrina T.S. )

The article is devoted to investigation of elastic wave velocity changes in day soils depending on their humidity values. Soil samples having natural and disturbed structure (made of clay pastes) were tested. The «elastic wave velocity - humidity (and humidity degree)» graphs were obtained. The existence of the humidity interval where the longitudinal wave velocities decrease was confirmed. Its boundary values that approximately coincide with the humidity interval limits from the maximal hygroscopic to maximal molecular moisture capacity and regularly increase depending on soil dispersity rise are determined.......

  • 2014  № 1, pp. 57-62

Facies analysis based on 3D seismic waveform

(Priezzhev I.I. Solokha E.V. Manral S. )

A new 3D waveform classification algorithm has been developed based on the SOM Kohonen or К-Mean. The seismic amplitude can be taken as input for the classification procedure. Seismic waveforms are classified in order to define seismic facies and stratigraphic changes in a specific interval, as well as geological zoning.......

  • 2014  № 1, pp. 63-67