Banca de DEFESA: BRUNO FREITAS GONÇALVES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : BRUNO FREITAS GONÇALVES
DATE: 12/02/2021
TIME: 14:00
LOCAL: Virtual
TITLE:
Seismic Refraction Tomography for Near-surface Velocity Model Building and Statics Corrections

 

KEY WORDS:

Seismic Processing, Seismic Tomography, Seismic Refraction, Statics Corrections, Inversion, Velocity Model Building


PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:
This work proposes a new methodology for the construction of 2D near-surface velocity models and statics corrections of land seismic data using surface refraction information. An algorithm, widely used in wide-angle seismic data for crustal modeling applications, was adapted for modeling and inversion of velocity and layer structure close to the surface. The proposed methodology was evaluated on four synthetic models built with real topography information and velocity models from geophysical and geological information. Three real land seismic data from 2D lines were also used. Initial models were built using traditional methods of interpreting shallow seismic refraction. Subsequently, the modeling and inversion were performed using a 2D tomography algorithm based on ray tracing to minimize the misfit of the observed and modeled traveltimes of the first arrivals, inverting the seismic velocities and vertical position of the refractor. For the synthetic data was observed that the algorithm obtained the smallest relative errors in most parameters of the model and in the estimation of static corrections. For the real data, a better stacking of the seismic reflections was observed in relation to traditional methods used in the stage of statics corrections in the seismic processing workflow. Also, for two seismic lines, the final model provided more reliable structural depths when compared to information from well data.


BANKING MEMBERS:
Externo à Instituição - ALÍPIO PEREIRA - PETROBRAS
Externo à Instituição - CLÁUDIO GUERRA CARDOSO
Presidente - 1347984 - GERMAN GARABITO CALLAPINO
Externo à Instituição - João Carlos Ribeiro Cruz - UFPA
Interno - 004.056.634-04 - LIACIR DOS SANTOS LUCENA - UFRN
Notícia cadastrada em: 27/01/2021 16:02
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