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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Correlating Sandstones
Within and Between Growth-Faulted Intraslope Subbasins; Rules and Common
Correlation Pitfalls
Brown, L. Frank, Jr.1,
Loucks, Robert G.1, and Trevi?o, Ramon H.1
ABSTRACT
Lowstand sandstone lithofacies (or any other facies) cannot
be correlated between different systems tracts within a subbasin or between
diachronous subbasins on the basis of similar wireline-log shape. Pattern
correlations equate only lithogenetically similar facies, not chronostratigraphically
equivalent facies. Log-facies maps are based on time-equivalent facies and
not genetically similar log patterns. On-shelf highstand and transgressive
sandstone facies do not correlate with off-shelf lowstand sandstone facies
within the same subbasin even though they occur between the same marine-condensed
sections. On-shelf and off-shelf sandstone depositional episodes were temporally
unique, and the facies are diachronous. Assumptions that in different subbasins,
lowstand sandstone facies that occur between the same condensed sections
are chronostratigraphically equivalent may lead to serious miscorrelations.
Subbasin lowstand tracts become younger basinward, even if they occur between
the same condensed sections. Laterally positioned subbasins on downthrown
sides of the same regional growth faults were filled contemporaneously,
and their basin fills are isochronous. Sandstone facies within high continuity
on-shelf highstand and transgressive systems tracts can be correlated lithostratigraphically
across large areas with confidence using the condensed section "envelope"
as proof of time-equivalence. On-shelf progradational or retrogradational
units are cut by high-frequency time lines precluding absolute equivalency
throughout. The lowstand sandstone facies within different subbasins must
be components of the same 3rd-or
higher frequency sequence before accepting time equivalence. The correct
way to ensure equivalency is to verify that the marine-condensed sections
at the top of the transgressive tracts within each sequence are faunally
equivalent.
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