Thermal history of potential gas reservoir rocks in the eastern Parnaíba Basin, Brazil
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2020
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The Parnaíba Basin is a major intracratonic sedimentary basin in
Brazil with unconventional petroleum systems as a potential
natural resource formed by the influence of igneous intrusions. To
constrain the thermal history of unexplored potential reservoir
rocks in the eastern part of the Parnaíba Basin, sedimentary rocks
near intrusions were analyzed by petrography and thermochronology
(apatite fission-track [AFT] and zircon fission-track [ZFT]
dating). Petrography shows grain dissolution and carbonate pore
filling generated by thermal destabilization of feldspars. The AFT
results indicate partial annealing by the last magmatic event in the
basin, and ZFT results show ages of maximum paleotemperature
compatible with the Sardinha magmatic event (120–130 Ma). In
thermal history models, rocks close to intrusions experienced
maximum paleotemperatures above 300°C, which is higher than
what is considered favorable for reservoir rocks. Hydrothermal
fluids modified the diagenetic evolution of the succession by
dissolving and precipitating carbonate cement in pore spaces. In
the studied area, at distances greater than 50m(>164 ft) from the
intrusion, the rocks were not substantially altered, and in terms
of paleotemperature, they can be considered potentially viable
reservoirs. The thermal history analysis of potential tight gas
sandstone reservoirs affected by intrusive bodies is valuable for
characterizing the thermal enhancement or destruction of the
reservoir’s qualities.
Como referenciar
CARDOSO JUNIOR, MARCIO; CHEMALE JUNIOR, FARID; OLIVEIRA, CHRISTIE H.E. de; CRUZ, CARLOS E. de S.; ABREU, CARLOS J. de; GENEZINI, FREDERICO A. Thermal history of potential gas reservoir rocks in the eastern Parnaíba Basin, Brazil. AAPG Bulletin, v. 104, n. 2, p. 305-328, 2020. DOI: 10.1306/05021918117. Disponível em: http://repositorio.ipen.br/handle/123456789/31102. Acesso em: 26 Apr 2024.
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