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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: 4-D
Seismic
Interpretation Technologies and their Application to the
Eugene Island 330 Field, Offshore Louisiana
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By
Lamont-Doherty Earth Observatory, Columbia University, New York
The Global Basins Research Network has
developed 4-D volume processing and attribute
analysis algorithms to identify significant
seismic
amplitude interconnectivity
and changes over time that result from
active fluid migration. To accomplish this
4-D imaging, we use multiple 3-D
seismic
surveys done several years apart over the
same blocks.
We have applied these 4-D analysis techniques
to known production from the most
prolific Pleistocene oil field in the world,
the Eugene Island 330 Field, offshore Louisiana.
Three main producing reservoirs
were examined at 4,500, 5,400, and 7,200
ft. Dim outs were detected where production
depleted oil and gas during the interval
of investigation, and amplitude increases
were observed where gas/oil ratios
increased during production. The "oil/water
contact" movement was detected by the
4-D technique. When combined with active
pressure add temperature monitoring,
repeated 3-D seismic
imaging of producing
fields promises to identify missed hydrocarbon
zones and to provide the critical
production management information of the
future.
In addition, we have imaged fluid flow pathways that are actively recharging shallower reservoirs in the field from fluid sources that appear to be turbidite stacks within salt withdrawal mini-basins buried deep within geopressure. Fault zone conduits provide the migration pathways out of geopressure. If correct, large reserves remain untapped within the deep shelf of the northern Gulf of Mexico.
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