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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Ancient Delta Systems in the Gulf Coast Area
Don R. Anderson (1)
ABSTRACT
The interpretation of ancient sedimentary environments of deposition is best done by using petrographic criteria coupled with the study of sedimentary structures and three-dimensional geometry. In subsurface studies, however, data are seldom available on these parameters, except perhaps the last, three-dimensional geometry.
The recognition of subsurface deltas and associated environments, which have proven to be the most important reservoirs for hydrocarbons in the Gulf Coast and elsewhere, depends on the use of gross interval isopach and net sand maps, and the use of the SP log profile as an indicator of vertical trends in grain size. Examples from the Wilcox (Eocene) of the southwest Texas, the Upper Miocene of southeast Louisiana, and the Mississippian of the Black Warrior basin (Mississippi and Alabama) illustrate the technique.
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