Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Seismic migration"”.
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Active imaging of rock fractures with ultrasonic reflection and seismic migration
Includes bibliographical references (pages 97-100).
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Tensorial elastodynamics and acoustodynamics for generalized seismic migration and inversion applications
… inversion problems within the exploration, microseismic, and earthquake seismology communities. The main driver is the need to accurately model and reproduce full-wavefield solutions, which represent the main computational effort for such applications as elastic reverse-time migration (E-RTM) and …
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Wave propagation in complex media, scattering theory, and application to seismic imaging
Migration is a seismic imaging method that consists of creating a representation of the Earth's subsurface structure from the recording of seismic waves. Migration is essentially equivalent to solving an inverse scattering problem in structurally complex media. Conventional migration algorithms …
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Automating Pre-Stack Migration Enhancement and Image Quality Analysis
The quality of a seismic migration image strongly depends on an accurate velocity model. However, the migration velocity model often contains errors causing artifacts that degrade seismic resolution and fidelity. Here, I propose a method to enhance the seismic migration image using processes in …
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Seismic imaging using internal multiples and overturned waves
Incorporating overturned waves and multiples in seismic imaging is one of the most plausible means by which imaging results might be improved, particularly in regions of complex subsurface structure such as salt bodies. Existing migration methods, such as Reverse Time Migration, are usually …
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Direct Waveform Inversion Using Explicit Time-Space Causality Principle
… model is beyond the finite recording time in seismic data. The DWI must use the full seismic wavefield, including internal and free-surface multiples, and it combines seismic migration and velocity model inversion into one single process. In this dissertation, I firstly illustrate the basic …
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Elastic time-reverse imaging and transmission tomography for microseismic and DAS VSP data
Wavefield migration and tomography are considered to be state-of-the-art methodologies used for subsurface geological characterization. Seismic tomography produces accurate velocity models that commonly serve as input into seismic migration algorithms that produce high-quality passive-source (e.g., …
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Elastic properties of sedimentary anisotropic rocks : (measurements and applications)
… well log synthetic seismograms with 2D and 3D seismic data. In addition, the seismically determined depths of reservoir horizons are greater than the well sonic log depths. To examine this discrepancy we conducted an experimental study of dynamic elastic parameters of the rocks in the oil …
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A Comparative Case Study of Reflection Seismic Imaging Method
… on the earth interior. The quality of seismic images is highly variable depending on the complexity of the underground and on how seismic data are acquired and processed. One of the crucial steps in this process, especially in layered sequences with complicated structure, is the time …