We have developed a case study of crosshole seismic tomography with a cross-firing geometry in which seismic sources were placed in two vertical boreholes alternatingly and receiver arrays were placed in another vertical borehole. There are two crosshole seismic data sets in a conventional sense. These two data sets are used jointly in seismic tomography. Because the local sediment is dominated...

This study focuses on measurements of clastic rocks ranging from 3 Hz up to 500 kHz in the laboratory and their application to well log analysis and a time-lapse study in the North Sea. Measurements of elastic properties over a large frequency spectrum can provide a better understanding of the dispersion and attenuation mechanisms in rocks and help to predict and model these effects. Sandstones...

Significant reduction in mechanical properties, i.e., elastic moduli and seismic wave velocities, as well enhanced inelastic attenuation is often associated with areas of partially molten rocks. In this paper we suggest a new mechanism responsible for significant velocity attenuation. The suggested considers solid-melt phase transition at thermodynamic equilibrium. Any pressure change, that tak...

Abstract Extracting seismic velocities from recorded data requires converting the shot gathers to mid-point gathers, calculating velocity spectrum, and picking values. In this paper, we propose use graph theory extract values directly gathers. We spectral of a weighted model for approximating velocity. develop regression predict largest eigenvalue representing physical system. The approach is t...