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 14 of 14 for “"Seismic processing"”.
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Adapting Seismic Processing Techniques for Data Preconditioning in Radar Imaging of Highly Dissipative and Dispersive Media
… dispersive breast tissues. Microwave imaging and seismic imaging deal with analogous problems. In seismic imaging, tremendous efforts have been invested in developing data analysis and preconditioning techniques to render the accurate graphical representation of specific portions of the earth’s …
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Seismic-Style Processing of Numerical Em Data
Standard seismic-processing methods are applied to numerical simulations for several variations of a standard 1-D numerical CSEM model, calculated using seismic-style acquisition parameters: an impulsive source and many receivers, unaliased. The data are normalized to unit maximum amplitude at each …
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I. THE FIRST MULTI-DIMENSIONAL INVERSE-SCATTERING-SERIES INTERNAL-MULTIPLE-ELIMINATION METHOD: A NEW TOOLBOX OPTION FOR REMOVING INTERNAL MULTIPLES THAT INTERFERE WITH A PRIMARY, WITHOUT DAMAGING THE PRIMARY, AND WITHOUT ANY KNOWLEDGE OF SUBSURFACE PROPERTIES II. TESTS AND ANALYSIS FOR RESOLUTION COMPARISONS BETWEEN REVERSE TIME MIGRATION (RTM) AND THE FIRST MIGRATION METHOD THAT IS EQUALLY EFFECTIVE AT ALL FREQUENCIES AT THE TARGET
The general goal of seismic exploration is to develop new capabilities in the seismic toolbox to increase our ability to locate hydrocarbons. There is a seismic processing chain of linked tasks that processes the data recorded by the receivers and produces subsurface images to serve that goal and …
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Seismic Imaging and Velocity Model Building in the Thrace Region, Northwestern Turkey: A Case Study
The aim of this research is to apply several seismic processing and imaging techniques to a raw 3D-land dataset and examine the quality of the subsurface images. This study uses a 3D-seismic dataset in the Thrace region of northwest Turkey that was acquired by Turkish Petroleum in 2006 covering an …
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Sampling and reconstruction of seismic wavefields in the curvelet domain
Wavefield reconstruction is a crucial step in the seismic processing flow. For instance, unsuccessful interpolation leads to erroneous multiple predictions that adversely affect the performance of multiple elimination, and to imaging artifacts. We present a new non-parametric transform-based …
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Randomized Algorithms for Mega-AI Models
… we apply them to personalized education, seismic imaging, and bioinformatics. Specifically, we show how modifying the ML algorithm can reduce seismic processing time from 10 months to 10 minutes.
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Structure and Tectonics of the Offshore Region Close to Kayak Island from Geophysical Information
… the offshore area close to Kayak Island. Seismic reflection data collected in 1976 in the offshore region of Kayak Island in the Gulf of Alaska were reprocessed in order to improve the quality of the signal by applying seismic data processing techniques that were not available at the time …
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Efficient seismic imaging with the double plane wave data
Seismic imaging is critical in providing the image of the Earth’s subsurface, and it plays an important role in hydrocarbon explorations. Obtaining high resolution images with accurate reflectivities and accurate positions of subsurface structures is the goal for exploration geophysicists. Reverse …
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Modeling, imaging and waveform-inversion in attenuative anisotropic media
Seismic attenuation, which is often anisotropic, has a profound influence on wave propagation and seismic processing. In addition to application of attenuation coefficients in lithology and fluid discrimination, compensation for angle-dependent attenuation and velocity dispersion is critically …
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The Challenges and Solutions of Green Seismic Survey: Imaging Deep Seafloor Structures with Cruise TN-373 Reflection Data
Seismic surveys in the past can be viewed as a trade-off between data quality and survey cost. As technology advances, the gap between these two demands has lessened. Nowadays, a new factor is emerging as more regulations are aimed at curbing the environmental impact of seismic surveys. I define …
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Using Radar and Seismic Methods for the Determination of Ice Column Properties and Basal Conditions at Jakobshavn Isbræ and the NEEM Drill Site
… from ice cores. Observations of anisotropic seismic wave propagation and backscatter variation as a function of antenna orientation in GPR measurements have been proposed as methods to detect COF. For this investigation I evaluate the effectiveness of the GPR and seismic methods to detect COF …
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Enhancing land seismic data with compressive sensing and processing
Active-source seismic methods can provide a wealth of information about the structural and stratigraphic makeup of the subsurface as well as about physical and reservoir properties of rocks. However, high-resolution imaging subsurface techniques are challenging to apply for land seismic data. …
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Hierarchical Bayesian approaches to seismic imaging and other geophysical inverse problems
… these properties may vary spatially. In the seismic imaging problem, for example, where the objective is to estimate the earth's reflectivity, the reflectivity model is smooth along a particular reflector but exhibits a sharp contrast in the direction orthogonal to the reflector. In such …
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Elastic-Wave Imaging Using P-P, Sh-Sh, and Sv-P Events: Modeling and Data Processing
This thesis focuses on using seismic data that were generated by a vertical vibrator and recorded by a vertical geophone to build two different subsurface images: a conventional P-P section and a converted-wave SV-P section. Radiation patterns are calculated based on Miller and Pursey’s equations …