Journal
AAPG BULLETIN
Volume 91, Issue 2, Pages 151-160Publisher
AMER ASSOC PETROLEUM GEOLOGIST
DOI: 10.1306/09250605085
Keywords
-
Categories
Ask authors/readers for more resources
Upper Paleozoic glacially related sandstones of the Itaran Group constitute thick and complex hydrocarbon reservoirs in the intracratonic Parand Basin of southern Brazil. Because these sandstones were deposited in both glacial and nonglacial environments, they show a high degree of variability in facies. In this article, we analyze outcrop and shallow well data to describe facies heterogeneities and their reservoir-quality implications. A regional subsurface sequence-stratigraphic framework was built, based on both strike- and dip-oriented well-to-well correlations. A well-exposed sandstone succession correlative with the main reservoir interval in the subsurface was selected in the eastern part of the basin. The Vila Velha sandstone comprises an up to 100-m (328-ft)-thick, unconformity-bounded, sand-rich succession composed of four stacked facies assemblages. Vertical facies succession shows a transition from glacial and glacio-marine to periglacial shallow-marine and nearshore settings, which define a retrograclational-prograclational succession. Channel-mouth bars and wave-modified shoreline sandstones in the progradational section contain stratigraphically predictable reservoir-quality lithofacies. In subsurface, gas-bearing sandstone intervals with the same well-log response occur below unconformities, which control the overall reservoir geometry.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available