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Previous issue date: 2015-08-24 / Ag?ncia Nacional do Petr?leo - ANP / A Sequ?ncia Neocarbon?fera-Eotri?ssica corresponde ao terceiro grande ciclo sedimentar da Bacia do Parna?ba e concerne litoestratigraficamente ao Grupo Balsas. Esta sequ?ncia ? descrita como um pacote de rochas cujos sedimentos foram depositados em um ambiente complexo, cl?stico/evapor?tico de mar raso, gradando para um ambiente lacustre/des?rtico. O principal objetivo deste trabalho foi realizar uma an?lise estratigr?fica da Sequ?ncia Neocarbon?fera-Eotri?ssica, visando uma melhor compreens?o da sua evolu??o. Para tal, foram empregados os conceitos modernos e gen?ticos da estratigrafia, utilizando-se como base de dados informa??es de po?os e se??es s?smicas. Para o intervalo estratigr?fico em quest?o foram identificadas tr?s sequ?ncias deposicionais. A Sequ?ncia 1 corresponde a rochas que foram depositadas inicialmente a partir de um sistema fluvial, que passa para um sistema marinho raso implantado durante uma fase transgressiva, e que posteriormente evolui para um sistema deltaico. A Sequ?ncia 2 corresponde a rochas que foram depositadas a partir de um ambiente lacustre/des?rtico, representando uma fase regressiva importante que culmina com a implanta??o de um ambiente des?rtico, o qual corresponde ? Sequ?ncia 3. Na an?lise sismoestratigr?fica foi poss?vel reconhecer as superf?cies cronoestratigr?ficas e as unidades gen?ticas identificadas em po?os e analisar a sua express?o lateral. De modo geral, as sismof?cies reconhecidas nas se??es s?smicas apresentam-se com configura??es paralelas a subparalelas, com grande continuidade lateral, sugerindo uma const?ncia na taxa de sedimenta??o durante a deposi??o desta sequ?ncia. / The Parna?ba Basin consists in an intracratonic basin whose sucession of rocks is
arranged in five supersequences. The Upper Carboniferous-Lower Triassic Sequence
represents the third major sedimentary cycle and corresponds to Balsas Group, which is
divided into four units: Piau? Formation, Pedra de Fogo Formation, Motuca Formation
and Samba?ba Formation, from base to top. Different interpretations have been made by
several authors in recent decades to interpreted the depositional system and
environments related to each unit that belongs to this sequence. In general way, it is
described as a thick pack of siliciclastic sediments deposited under complex conditions,
varying from clastic/evaporitic shallow marine to lacustrine and desert environment.
Aiming to clarify the sedimentary sequence evolution, this work underwent a
stratigraphic analysis of the Upper Carboniferous-Lower Triassic deposits by applying
modern concepts of the sequence stratigraphy based on well and seismic database.
Three main depositional sequences of higher frequency were identified in each well
analyzed. The sequence 1 corresponds to rocks initially deposited by a fluvial system
with braided channel characteristics which evolved to shallow marine with coastal
sabkha conditions related to a transgressive stage, that later evolved to a deltaic system.
The Sequence 2 corresponds to rocks deposited in a lacustrine/desert environment
associated with sabkha generated during a period of increased aridity in which the area
occupied by the Parna?ba Basin had been suffering. The registration of a major
regressive phase is shown in Sequence 2 which evolved to a dominantly desert
environment recorded in Sequence 3. Seismic stratigraphy analyses allow to define a
series of stratigraphic surfaces and related genetic units, as well as to infer its lateral
expression. Seismic facies associated with such sequences are dominantly parallel and
sub-parallel, with good lateral continuity, suggesting the sedimentary rate was relatively
constant during deposition.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21057 |
| Date | 24 August 2015 |
| Creators | Barbosa, Everton N?brega |
| Contributors | 59176911691, Silva, Carlos Cesar Nascimento da, 81352921472, Cruz, Liliane Rabelo, 03026147451, Cordoba, Valeria Centurion |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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