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Previous issue date: 2016-06-07 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / O alvo da presente pesquisa ? a regi?o do baixo curso do Rio Maxaranguape, localizado no litoral leste do Estado do Rio Grande do Norte e, particularmente, no dom?nio hidrogeol?gico do Aqu?fero Barreiras. Este trabalho teve como principal objetivo analisar a influ?ncia da estrutura??o regional na geometria do aqu?fero na ?rea de estudo (considerando a ocorr?ncia de varia??es de sua espessura), com intuito de efetuar o c?lculo otimizado das reservas hidrogeol?gicas locais na referida ?rea. A metodologia adotada foi fundamentada na utiliza??o de t?cnicas de an?lise morfotect?nica, litoestratigr?fica em correla??es de perfis de po?os, hidrogeol?gica e geoel?trica (Sondagem El?trica Vertical - SEV). O m?todo geof?sico da eletrorresistividade foi adotado a fim de inferir valores de espessura do aqu?fero e profundidade do topo do embasamento hidrogeoel?trico. Foram realizadas 17 SEV com abertura m?xima de AB=1200m (arranjo Schlumberger), distribu?das de forma a cobrir toda a ?rea de estudo, buscando assim, suprir a falta de informa??es nas regi?es onde n?o havia a presen?a po?os. Integrado ?s SEVs, dados hidroestratigr?ficos/litol?gicos de 21 perfis de po?os tubulares foram utilizados, 5 perfis hidrogeof?sicos foram gerados para defini??o de rejeitos de falha, bem como realizada uma an?lise geomorfol?gica, que visou a caracteriza??o estrutural da ?rea com ?nfase na compartimenta??o do aqu?fero. A an?lise geomorfol?gica foi realizada utilizando-se dados topogr?ficos (SRTM - Shuttle Radar Topography Mission) e hidrogr?ficos, subsidiando a caracteriza??o estrutural, tendo em vista a n?o ocorr?ncia de afloramentos com crit?rios cinem?ticos. Os dados topogr?ficos s?o apresentados na forma de um mapa de anomalias topogr?ficas residuais e defini??o de lineamentos topogr?ficos. Os dados hidrogr?ficos ressaltam dire??es preferenciais dos canais fluviais e anomalias dessa rede hidrogr?fica, na forma de deflex?es abruptas das drenagens e alinhamentos de outras fei??es superficiais tais como nascentes. Os resultados dessa an?lise possibilitaram a elabora??o de um mapa de lineamentos morfotect?nicos, dispostos segundo as dire??es predominantes NE e NW. Perfis hidrogeof?sicos, obtidos a partir de modelos geoel?tricos inversos e informa??es de po?os, foram elaborados de forma a interceptar tais lineamentos, enfatizando valores de espessuras saturadas variando de 19 a 66 metros, caracterizando alguns desses lineamentos como falhas. A avalia??o das reservas hidrogeol?gicas locais foi efetuada considerando-se 18 sub?reas, associadas a blocos resultantes da compartimenta??o estrutural. Nesse contexto, as reservas de satura??o s?o da ordem de 8,7x108 m3, adotando-se espessuras saturadas m?dias para cada sub?rea e porosidade efetiva de 7,6%. / The target area of this research is the Maxaranguape River lower course, located on the east coast of Rio Grande do Norte state, and particularly the hydrogeological domain Barreiras Aquifer. This study aimed to analyze the influence of regional structure in the geometry of the aquifer in the study area (taking into account thickness variations), in order to make an optimized calculation of local hydrogeological reserves in that area. The methodology was based on the use of morphotectonic and lithostratigraphic analysis techniques, in well profile correlation, as well as hydrogeological and geoelectric analysis (Vertical Electrical Sounding - VES). The geophysical method of electrical resistivity was adopted in order to infer thickness values of the aquifer and depth of the basement. It were carried out 17 SEV with maximum aperture of current electrodes (AB) of 1200 meters, distributed so as to cover the entire study area, although primarily seeking to obtain data for subareas with little or no well information. Hydro-stratigraphic and lithologic data from 21 wells profiles were integrated with VES data, 5 hydrogeophysical profiles were generated to define downthrow and a geomorphological analysis was performed, which aimed at the structural characterization of the area with emphasis on aquifer compartmentalization. The morphotectonic analysis used the topographic (SRTM) and hydrographical data to support the structural characterization taking into account the lack of outcrops with specific features in the area. Topographic data are presented as a map of residual topographic anomalies, with defined topographic lineaments. Hydrographic data underscore preferred directions of fluvial channels and anomalies of this hydrogeophysical network with abrupt deflections of drainages and alignments of other surface features such as springs. The results of this analysis enabled to draw up a morphotectonic lineaments map, arranged according to the prevailing NE and NW directions. The results of this analysis enabled the development of a map of morphotectonic lineaments, arranged according to the prevailing NE and NW directions. The hydrogeophysical profiles, obtained from geoelectric inverse models and well data, were prepared to intercept the lineaments, emphasizing saturated thickness values ranging from 19 to 66 meters, and featuring some of these lineaments as faults. The hydrogeological reserves were evaluated considering 18 subareas associated with blocks resulting from structural compartmentalization. Therefore, the saturation reserves are the order of 8.7x108 m3, considering average saturated thickness for each subarea and 7.6% average effective porosity.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21576 |
| Date | 07 June 2016 |
| Creators | Nunes, Lucas Miguel Gomes |
| Contributors | 67164358400, http://lattes.cnpq.br/4673404543485023, Bezerra, Francisco Hilario Rego, 37923579415, http://lattes.cnpq.br/6050302316049061, Stein, Paula, 95031103000, http://lattes.cnpq.br/2752611203107511, Silva, Carlos Cesar Nascimento da, Lucena, Leandson Roberto Fernandes de |
| Publisher | 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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