Estudo de depósitos da formação barreiras com base em reflexão por ondas de radar

Authors

  • Paula de Freitas Santos Universidade Federal do Rio de Janeiro; Centro de Ciências Matemáticas e da Natureza; Instituto de Geociências; Departamento de Geologia
  • Claudio Limeira Mello Universidade Federal do Rio de Janeiro; Centro de Ciências Matemáticas e da Natureza; Instituto de Geociências; Departamento de Geologia
  • Rute Maria Oliveira de Morais PETROBRAS; E& P-EXP; IABS; OS
  • Carolina da Silva Ribeiro Universidade Federal do Rio de Janeiro; Centro de Ciências Matemáticas e da Natureza; Instituto de Geociências; Departamento de Geologia

DOI:

https://doi.org/10.5327/S1519-874X2006000300005

Keywords:

Barreiras Formation, radar facies, Southeastern Brazil

Abstract

This paper integrates radar reflection sections (GPR - Ground Penetrating Radar) with lithologic profiles based on sounding logs in deposits of the Barreiras Formation at selected points in the northern part of Rio de Janeiro State and southern part of Espirito Santo State. Three radar survey lines were investigated by common-offset mode using PulseEkko IV radar system and 50 MHz antennas. Based on interpretation of the main radar facies and units evident in the GPR lines, sampling points were selected for obtaining sounding logs using a mechanical auger. The Barreiras Formation deposits here described correspond to fining-upward sandy successions. In the geophysical survey, these sandy deposits are associated with more-or-less continuos wavy reflection patterns presenting a cross-bedded aspect and concave-upward geometry (radar facies II). Argillaceous mudstone layers interbedded with the sandy deposits are associated with a continuous, parallel reflection pattern (radar facies I). The Barreiras Formation sediments are interpreted as fluvial channel deposits, with little contribution of suspended sediments or gravitational flow deposits, in agreement with previous interpretations based on outcrop deposits in these regions.

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Published

2006-10-01

Issue

Vol. 6 No. 2 (2006)

Section

Articles

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How to Cite

Santos, P. de F., Mello, C. L., Morais, R. M. O. de, & Ribeiro, C. da S. (2006). Estudo de depósitos da formação barreiras com base em reflexão por ondas de radar . Geologia USP. Série Científica, 6(2), 31-42. https://doi.org/10.5327/S1519-874X2006000300005