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SEDIMENTOS ALBO-SANTONIANOS DA BACIA SERGIPE-ALAGOAS: AMBIENTES DE SEDIMENTAÇÃO E PERSPECTIVAS PETROLÍFERAS

1987; Sociedade Brasileira de Geologia; Volume: 17; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.1987135138

ISSN

2177-4382

Autores

César Cainelli, NELSON ADÃO BABINSKI, REGINA CÉLIA RABELO DOS SANTOS, NAMIO UESUGUI,

Tópico(s)

Geography and Environmental Studies

Resumo

The sedimentary sequence from Albian toSantonian in Sergipe-Alagoas Basin comprises Riachuelo and Cotinguiba formations. It represents the initial development of an open marine sedimentation in the tectonic-sedimentary evolution of the Brazilian continental margin basins. The Albian/Cenomanian rocks (Ríachuelo Formation) are composed of coarse terrigenous sediments (Angico Member) at the border of the basin, grading laterally to shales interbedded with carbonates (Taquari Member), and are topped by ao essentially carbonatic sequenee with development of large oolitic bars and algalic biolithites (Maruim Member), deposited in shallow marine conditions. The Turonian to Santonian rocks (Cotinguiba Formation) are composed mostly of laminated hemipelagic calcilutites, deposited at the slope of a carbonate platform which was entirely eroded. Shales from the lower part of Taquari Member have good oil-source potential but are thermally immature. The best prospeets of the studied sedimentary sequence are fraetured calcilutites, associated with halokynetic structures and paleo-highs basements.

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