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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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This study was undertaken to investigate (1) the different
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situations of fault
entrapment of hydrocarbons in Tertiary sediments of the Gulf Coast salt basin, and (2) the role of juxtaposed sediments in a sandstone-shale sequence in creating sealing and nonsealing faults.
Fault
-controlled accumulations in the hydropressured Tertiary section were studied in 10 Gulf Coast fields located on low relief structures. Investigations were limited to traps associated with faults which restrict vertical migration of hydrocarbons, that is, where an accumulation is in contact with the
fault
. The relations observed among
fault
, lithology, and accumulation are (1)
fault
sealing, with hydrocarbon-bearing sandstone in lateral juxtaposition with shale; (2)
fault
nonsealing to lateral migration, with parts of the same sandstone body juxtaposed within the hydrocarbon column; (3)
fault
nonsealing to lateral migration, with sandstone bodies of different ages juxtaposed within the hydrocarbon column; and (4)
fault
sealing, with sandstone bodies of different ages juxtaposed w
thin the hydrocarbon column. In some places these four relations are present at different levels along the same
fault
.
In the examples studied, faults nonsealing to lateral migration were observed only where parts of the same sandstone body are juxtaposed across a fault
. With sandstone bodies of different ages juxtaposed, some faults are sealing and others are nonsealing to lateral migration, but sealing faults are the most common. The
fault
seal apparently results from the presence of boundary
fault
-zone material emplaced along the
fault
by mechanical or chemical processes related directly or indirectly to faulting.
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