Seismic interferometry has become a technology of growing interest for imaging borehole seismic data. We demonstrate that interferometry of internal multiples can be used to image targets above a borehole receiver array. By “internal multiples” we refer to all types of waves that scatter multiple times inside the model. These include, for instance, interbed, intra-salt and water-bottom multiple...

The objective of this work is to build an efficient algorithm (a) to estimate seismic velocity from time-migration velocity, and (b) to convert time-migrated images to depth. We establish theoretical relations between the time-migration velocity and the seismic velocity in 1 Page 1 of 23 GEOPHYSICS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 3...

This paper presents least-squares wave equation AVP (Amplitude versus Ray Parameter) migration with non-quadratic regularization. We pose migration as an inverse problem and propose a cost function that makes use of a priori information about the AVP common image gather. In particular, we introduce two regularization goals: smoothness along the ray parameter direction and sparseness in the dept...

The significance of the seismic rotational components have been overlooked in the seismic evaluation of structural behavior. As researchers have measured seismic components more accurately using sensitive rotational velocity sensor, it was observed that the magnitude of rotational components is considerable and could not be neglected. Hence, some parts of seismic damage or failure of structures...

The objective was to build an efficient algorithm 1 to estimate seismic velocity from time-migration velocity, and 2 to convert time-migrated images to depth. We established theoretical relations between the time-migration velocity and seismic velocity in two and three dimensions using paraxial ray-tracing theory. The relation in two dimensions implies that the conventional Dix velocity is the ...

A matching pursuit technique in conjunction with an imaging method is used to obtain quantitative information on geological records from seismic data. The technique is based on a greedy, non-linear search algorithm decomposing data into atoms. These atoms are drawn from a redundant dictionary of seismic waveforms. Fractional splines are used to define this dictionary, whose elements are not onl...

A matching pursuit technique composed with an imaging method is used to obtain quantitative information on geological records from seismic data. The technique is based on a greedy non-linear search algorithm decomposing data into atoms. These atoms are drawn from a redundant dictionary of seismic waveforms. Fractional splines are used to define this dictionary, whose elements are not only desig...

Ray-based reflection tomography has become widely used as a tool for updating velocity models in depth imaging. Historically, development of ray-based tomography for depth imaging followed two separate methodologies. Early ray-based tomography was based on differences in traveltime observed between modeled data and actual seismic data (Bishop et al, 1983). As technology for imaging in complex a...

State-of-the-art 3-D volume visualization and systematic approach of analysing gathers, 2-D and 3-D seismic and well data help in achieving better success ratio in the upstream sector of petroleum industry. Thorough 3-D volume visualization is impossible without the establishment of Virtual Reality Centres which need to be equipped with (i) multi-processors, (ii) good amount of RAM (iii) High s...

In this paper we use methods from partial differential equations, in particular microlocal analysis and theory of Fourier integral operators, to study seismic imaging in the wave-equation approach. Seismic data are commonly modeled by a high-frequency single scattering approximation. This amounts to a linearization in the medium coefficient about a smooth background. The discontinuities are con...