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Previous issue date: 2011-08-29 / The main objective of the present thesis was the seismic interpretation and seismic attribute
analysis of the 3D seismic data from the Siririzinho high, located in the Sergipe Sub-basin
(southern portion of Sergipe-Alagoas Basin). This study has enabled a better understanding
of the stratigraphy and structure that the Siririzinho high experienced during its
development. In a first analysis, we used two types of filters: the dip-steered median filter,
was used to remove random noise and increase the lateral continuity of reflections, and
fault-enhancement filter was applied to enhance the reflection discontinuities. After this
filtering step similarity and curvature attributes were applied in order to identify and
enhance the distribution of faults and fractures. The use of attributes and filtering greatly
contributed to the identification and enhancement of continuity of faults. Besides the
application of typical attributes (similarity and curvature) neural network and fingerprint
techniques were also used, which generate meta-attributes, also aiming to highlight the
faults; however, the results were not satisfactory. In a subsequent step, well log and seismic
data analysis were performed, which allowed the understanding of the distribution and
arrangement of sequences that occur in the Siririzinho high, as well as an understanding of
how these units are affected by main structures in the region. The Siririzinho high comprises
an elongated structure elongated in the NS direction, capped by four seismo-sequences
(informally named, from bottom to top, the sequences I to IV, plus the top of the basement).
It was possible to recognize the main NS-oriented faults, which especially affect the
sequences I and II, and faults oriented NE-SW, that reach the younger sequences, III and IV.
Finally, with the interpretation of seismic horizons corresponding to each of these
sequences, it was possible to define a better understanding of geometry, deposition and
structural relations in the area. / A presente disserta??o tem como objetivo principal a interpreta??o s?smica e an?lise
de atributos s?smicos do alto de Sirizinho, localizado na Sub-bacia de Sergipe (por??o sul da
Bacia Sergipe-Alagoas). Tal estudo possibilitou um melhor entendimento da estratigrafia e
estrutura??o que o alto experimentou durante o seu desenvolvimento. Em uma primeira
an?lise, foram utilizados dois tipos de filtros, sendo o dip-steered median filter, com a
finalidade de retirar os ru?dos aleat?rios e aumentar a continuidade lateral das reflex?es, e o
fault-enhancement filter para real?ar as descontinuidades das reflex?es. Ap?s esta etapa de
filtragem foram aplicados os atributos de similaridade e curvatura, para se identificar a
distribui??o das falhas. O uso dos atributos e filtragens colaborou fortemente para a
identifica??o e o realce da continuidade dos falhamentos. Al?m da aplica??o dos atributos
t?picos (similaridade e curvatura) foram utilizadas as t?cnicas de redes neurais e fingerprint,
que geram meta-atributos, tamb?m com o objetivo de real?ar os falhamentos. No entanto, os
resultados obtidos n?o foram satisfat?rios. Em etapa subsequente com a avalia??o dos perfis
geof?sicos e do dado s?smico, foi poss?vel realizar a interpreta??o sismoestrutural e
sismoestratigr?fica que permitiram o entendimento da distribui??o e arranjo das sequ?ncias
que capeiam o alto de Siririzinho, bem como da compreens?o de como estas unidades s?o
afetadas pelas principais estruturas da regi?o. O alto de Siririzinho compreende uma
estrutura d?mica alongada na dire??o N-S, capeada por quatro sismossequ?ncias
(informalmente nomeadas, da base para o topo, de sequ?ncias I a IV, al?m do topo do
embasamento). Foi poss?vel reconhecer falhamentos com orienta??o principal N-S, que
afetam especialmente as sequ?ncias I e II, e falhamentos com orienta??o NE-SW que
atingem as sequ?ncias mais jovens, III e IV. Por fim, com a interpreta??o dos horizontes
s?smicos correspondentes a cada uma dessas sequ?ncias, foi poss?vel definir um melhor
entendimento da geometria, deposi??o e das rela??es estruturais na ?rea estudada.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/18819 |
| Date | 29 August 2011 |
| Creators | Francelino, Arthur V?ctor Medeiros |
| Contributors | CPF:97038210491, http://lattes.cnpq.br/1519973126832391, Reis, Antonio Tadeu dos, CPF:85755575720, http://lattes.cnpq.br/8212550476765235, Silva, Fernando Cesar Alves da, CPF:15461483453, http://lattes.cnpq.br/8572129314081197, Antunes, Alex Francisco |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Geodin?mica e Geof?sica, UFRN, BR, Geodin?mica; Geof?sica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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