| Autor: |
Jean M. Flexor, Sergio L. Fontes, Maxwell Meju, Flora F. Solon |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15–18 August 2011. |
| DOI: |
10.1190/sbgf2011-055 |
| Popis: |
The magnetotelluric (MT) method has been widely used in studies of terrestrial and marine Brazilian basins. A major problem in oil exploration is precisely locating basement fracture-zones and heterogeneous carbonate reservoirs underneath thick overburden. Fractures in granitic zones, massive carbonates rocks can be detectable by EM methods, since it is geologically expected that this rock may form regional unconformityrelated conductive horizons. In the present study we analyzed several MT soundings from the central region of Sao Francisco Basin in northwest portion of the state of Bahia near the region called Remanso do Fogo in Brazil. We obtained EM attributes from various geological formations of Sao Francisco basin. The main thrust was to obtain depth-converted EM attributes of fractured carbonate rocks and to map the resistivity structure of well-known portions of the basins. It is shown that the stratigraphic groups characterized in seismic reflection images are in agreement with structural features revealed by MT conductivity imaging. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
