Banca de DEFESA: YURI SHALOM DE FREITAS BEZERRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : YURI SHALOM DE FREITAS BEZERRA
DATE: 04/10/2021
TIME: 09:00
LOCAL: Virtual via Google Meet (meet.google.com/nss-ppfi-hgs)
TITLE:

Multidimensional regularization and interpolation of seismic data using Matchin Pursuit, MWNI and ALFT algorithms

KEY WORDS:

Seismic Processing, Seismic Regularization, Multidimensional Interpolation, Fourier Transform, Matching Pursuit

PAGES: 92
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

One of the great challenges in the seismic imaging is the data acquisition, since these are frequently sampled in an irregular way with many shots and missing traces due to logistical restrictions in the sources and geophones distribution. This causes a serious problem of covering subsurface structures of interest, as well as making it difficult to apply processes to treat and modify the data for a better interpretation of these structures. Thus, regularization and interpolation are essential to obtain better results and facilitate subsequent steps in seismic data processing. Techniques based on the Fourier transform show the best results due to the ability to capture both correct amplitude and continuity of events. The Minimum Weighted Norm Interpolation (MWNI) technique estimates the Fourier coefficients that synthesize the spatial positions of the data through the regularized inversion of a desired regular grid. Unlike Matching Pursuit and Anti-Leakage Fourier Transform (ALFT), they use an iterative procedure to calculate the spectrum of irregularly sampled data for a regular grid. In this thesis it is proposed the implementation and comparative testing of the mentioned algorithms. Numerical examples using 1D and 2D harmonic functions exemplify capability to handle sparse data. Application to synthetic seismic section show capability to handle large gaps between seismic traces. Application to 2D land seismic data from Parna\'iba basin show significantly improve in stacked and migrated seismic sections. All results show Matching Pursuit and ALFT have similar and better results than MWNI.

BANKING MEMBERS:
Presidente - 1347984 - GERMAN GARABITO CALLAPINO
Interno - 1379465 - GILBERTO CORSO
Externo à Instituição - João Carlos Ribeiro Cruz - UFPA
Interno - 004.056.634-04 - LIACIR DOS SANTOS LUCENA - UFRN
Externo à Instituição - MANUEL DE JESUS DOS SANTOS COSTA - UFPA