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Mechanism of Elastic Waves Reflection in Geological Media

International Journal of Geosciences 2012年第1期3卷 175-178页

作者： Viktor Sidorov michail tarantin Organization of Russian Academy of Sciences Mining Institute Ural Branch RAS Perm Russia

Reflecting properties of layered geological media are substantiated in the framework of phonon-phonon mechanism of elastic wave propagation in porous media. In this scope the reflection coefficient is calculated using not impedances but impulses of phonons in adjoining porous media. Assuming for the first approximation that rocks do fulfill an average time equation we got an expression for the reflection coefficient via porosity factors of that geological medium. For calculation of reflection coefficient the wavelength is chosen as averaging line scale. These coefficients are calculated at every depth point for a set of frequencies in seismic range. Resulting curves have special depth points. Being cross-plotted in time-frequency space such points do form coherent units. These units we call effective boundaries, because they cause all reflections for the given media in the framework of considered model. Effective boundaries are not wide-band as for two half spaces but have a cutoff at some low frequency. Geological medium at a whole is characterized by the system of such effective boundaries that are capable to form a reflection waves field. To construct this field an algorithm is developed that solves the direct problem of seismic in the framework of effective boundaries theory. This algorithm is illustrated with vibroseis survey modeling for a specific geological section.

关键词： Elastic Waves Phonons Heterogeneous Media Reflection Coefficient Direct Seismic Problem Effective Seismic Boundaries

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Polar 3D Transformation of the Full Gradient of Attractive Potential

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International Journal of Geosciences 2012年第2期3卷 329-332页

作者： Gennady Prostolupov michail tarantin Laboratory of Geopotential Fields Perm Russia

The method of 3D polar transformation of full gravity potential gradient vectors is based on the geometric properties of the crossing points of complete gradient of the potential to localize the source region that causes the observed anomaly. The cross-points—poles—are defined for rectangular polygons of different sizes where the full gradient vector is defined at every vertex. The polygon size range could be specified. The set of poles, positive and negative, is then represented on the 3D chart in the form of clusters of dots or cubes and can be considered as a model image of the sources, intended for visual analysis and further interpretation.

关键词： Gravity Anomaly Interpretation Model Vector Full Gradient 3D Chart

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