Banca de DEFESA: ODMAKSUEL ANISIO BEZERRA DANTAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ODMAKSUEL ANISIO BEZERRA DANTAS
DATA : 15/08/2016
HORA: 10:00
LOCAL: DGEF
TÍTULO:

 

Structure determination and subsurface speed in an oil field using seismic noise environment.

PALAVRAS-CHAVES:

Ambient Noise Interferometry Seismic; Cross-Correlation; Stacking; Seismic Modeling.

PÁGINAS: 63
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The noisy signals recorded during the monitoring hydraulic fracturing operations in an oil field can provide important information on the structure of the subsoil. Such information is extracted through a set of procedures for analyzing and processing data, based on the technique of of Ambient Noise Interferometry Seismic (ANSI). In practice, the technique involves the application of two steps: the cross-correlation, which is equivalent to a convolution of the signals with each other in reverse time and the stacking the results generated. The answer is found by this is equivalent to empirical Green function convolved the medium of the source wavelet and therefore, the seismic interferometry recovery is also called the Green function. In this work, new seismic responses were obtained by combining two cross-correlation techniques (classical cross-correlation geometrically normalized - CCGN and phase cross-correlation - PCC) with two stacking techniques (linear stack - LS and the nonlinear stack or phase-weighting stack - PWS). Consequently, four approaches have been reached which, after undergoing a standard processing flow of seismic data resulted in four stacked seismic sections (LS-PCC - linear stack with phase cross-correlation, TS-CCGN - linear stack with classical cross-correlation geometrically normalized, PWSPCC - nonlinear stack with phase cross-correlation and PWS-CCGN - nonlinear stack with classical cross-correlation geometrically normalized). To interpret the results, a direct seismic modeling was performed to obtain a synthetic seismic section. Interpretation of the results with the use of synthetic data information and geology showed that some events corresponding to geological markers were recovered. This adds to the confirmation that is possivel retrieve the reflections of an environment in the subsurface using ambient seismic noise records and seismic interferometry technique.

MEMBROS DA BANCA:
Presidente - 1451214 - ADERSON FARIAS DO NASCIMENTO
Externo ao Programa - 1675166 - JOSIBEL GOMES DE OLIVEIRA JUNIOR
Externo à Instituição - MARCELO PERES ROCHA - UnB