Bedregal, Ricardo Perez1,
Garry David Karner2, Felix T.T. Goncalves3 (1) LAB2M /
COPPE / UFRJ, rio de janeiro,
Brazil (2) ExxonMobil Company, Houston, TX (3) PGT
Petroleum Geoscience Technology, Rio de janeiro, Brazil
During a lithospheric
extension event, depositional packages and their bounding surfaces are a
consequence of the distribution, in time and space, of the rift system along
the margin, and of the resultant structural and sedimentological
interactions. The main goal of this work is to map the distribution and
amplitude of the extensional tectonics responsible for the preservation of the
sedimentary record of Camamu-Almada basin, in the
Brazilian eastern margin.
Syn-rift evaporites and post-rift sediments regional distribution
and thicknesses along this margin are not consistent with the observed weak
brittle Early Cretaceous deformation. The existence of an intracrustal
detachment is suggested, in order to explain the deformation
compartmentalization along depth. Maximum heat flow modeled for the end of the
rift phase, in both margins, is circa 200-220 mW/m2 in deep water and 42-70
mW/m2 in the coast region.
As a consequence of the extreme thinning
of the lower crust and lithospheric mantle, the
viability of potential source rocks and deep-water regions prospectivity
in the Brazilian margin will mostly depend on the delicate interaction between
the extended lithosphere cooling and subsequent burial of potential source
rocks, in time.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California