Banca de QUALIFICAÇÃO: FILIPE RAMOS DE ALBUQUERQUE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : FILIPE RAMOS DE ALBUQUERQUE
DATA : 10/11/2017
HORA: 14:00
LOCAL: Laboratório de Análises Estratigráficas
TÍTULO:

The Use of Seismic Attributes to Enhance Diffraction Events in Radargrams

PALAVRAS-CHAVES:

Diffractions, Seismic Atributtes, GPR

PÁGINAS: 20
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

For the methods, seismic and GPR, which use propagation of waves in the middle and the recording of the return of these waves to the receiver on the surface we can highlight 3 possibilities of recorded events: reflections, refractions and diffractions. Like reflection, diffraction is a phenomenon that occurs with wave fronts, both electromagnetic and acoustic. The diffraction occurs with wave fronts that reachs edges, vertices or corners of boundary surfaces (Keller, 1962); discontinuities that act as point sources (Taner et al., 2006); objects, particles or obstacles (Liu, 2011). Local structures and lithologies are features that cause diffraction (Khaidukov et al., 2004). They can be fractures, faults, geological bodys like intrusions and Bioconstructions (Landa 2012), salt domes and discontinuities of layers of rock. However, diffractions are commonly considered noise (Khaidukov et al., 2004). This work presents a pioneering methodology for the enhancement of diffraction: the use of seismic attributes (or GPR) that measure the kinematic and energy properties related to the diffraction, distinguishing them from the reflections events. The methodology, in summary, consists of estimating the dip, the curvature and amplitude of the diffractions that differentiate them from the reflections and use such a distinction to eliminate the latter. This results in a diffraction image (section with enhanced diffraction).

MEMBROS DA BANCA:
Interno - 1315614 - DAVID LOPES DE CASTRO
Interno - 1161652 - FRANCISCO PINHEIRO LIMA FILHO
Interno - 349684 - WALTER EUGENIO DE MEDEIROS