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Marine seismic data processing for subsurface imaging of an area in Ionian sea

Triantafyllou Marios

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Year 2021
Type of Item Master Thesis
Bibliographic Citation Marios Triantafyllou, "Marine seismic data processing for subsurface imaging of an area in Ionian sea", Master Thesis, School of Mineral Resources Engineering, Technical University of Crete, Chania, Greece, 2021
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Seismic reflection data for a2D offshore seismic line (80 Km) located in the south Ionian Sea was processed for this thesis. The purpose of the seismic data processing was the subsurface imaging of the aforementioned deep-sea region. Marine seismic data are typically imprinted with multiples energy, which is undesirable in seismic imaging. In order to increaseS/N ratio, two methods for the suppression of multiples were applied and two processing sequenceswere introduced which provide an improved image.The processing of the seismic data has been implemented using the seismic processing and imaging software ProMAX 2D. Prior to poststack Kirchhoff time migration and constantoffsetprestack Kirchhoff migration, multiple attenuation methods and trace processingmethods were applied. A velocity analysis has been accomplished by using the semblance method to determine the RMS velocities, further used for multiple constant velocity stacks with dip filter method. Multiple attenuation methods include f-k filtering for the suppression of long period multiples and predictive deconvolution, which was applied to the stacked section to suppress water column reverberations.

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