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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Migration
Estimates
1Manuscript received January 12, 1998; revised manuscript received December 21,
1998; final acceptance January 15, 2000.
2Division of Geology-Geochemistry, Institut Français du Pétrole, 1 and 4
Avenue de Bois Préau, 92852 Rueil Malmaison Cedex, France; e-mail: [email protected]
3Petrobras Research and Development Center - Cenpes, Cidade Universitária,
Quadra 7, Ilha do Fundão, 21949-900, Rio de Janeiro, RJ, Brazil.
ABSTRACT
migration
. Positive values of the second parameter indicate that gases accumulated far
from their source, whereas negative values correspond to residual gas pools after leakage
of a part of the fluids. A tentative reconstruction of the gas history has been performed
in two Brazilian basins: the Espirito Santo basin and part of the Recôncavo basin. The
Espirito Santo basin is located on the passive continental margin of the Atlantic Ocean,
and the Recôncavo basin corresponds to an intracontinental aborted rift. In both cases,
the source rocks are mainly lacustrine, with thermal maturities ranging between the oil
window and the beginning of the gas window. Results show that in the Recôncavo basin, a
major fault (the Mata Catu fault) acts as a drain for hydrocarbon
migration
at the basin
scale, associating a major isotopic fractionation to the gas
migration
with a clear
correlation between isotope fractionation and the distance of
migration
. In the Espirito
Santo basin, this segregation appears in the platform sediments to a lesser extent and is
absent in the gas pools located in the paleocanyons filled with turbidites. This
long-distance
migration
in the platform sediments suggests that a hydrocarbon kitchen is
located offshore.
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