About This Item
- Full text of this item is not available.
- Abstract PDFAbstract PDF(no subscription required)
Share This Item
The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Development Drilling and Assessment in a 40-year Old Oil
Field: New Opportunities Through the Integration of
Depositional System and
Sequence
Stratigraphic Analyses
with Cumulative Production Histories
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
By
Grand Isle 43 is an oil and gas field in
the Gulf of Mexico that was discovered in
1955. This field is currently being re-evaluated
in the context of depositional system
and sequence
stratigraphic analyses. These
analyses, which are largely
well
log
and, to
a lesser extent core based, have been integrated
with cumulative production histories
and have led to the identification of
bypassed or underexploited reservoir compartments,
and consequently additional
drilling locations.
This study focuses on the Middle Miocene JR sandstone, one of 93 pay sands in Grand Isle 43. Reservoir compartments in this field are delineated primarily by flooding surfaces overlain by fine-grained transgressive deposits, and maximum flooding surfaces, lying within fine grained transgressive to highstand deposits. At initial discovery, a common oil/water contact was observed in the JR sand. Recent drilling, however, has shown there to be multiple oil/water contacts as some compartments have been drained and others not.
The depositional model suggests that
the producing sandstones are part of a
shingled, offlapping shelf-edge lowstand
systems tract progradational shoreface/deltaic succession. Several orders of permeability
barriers have been identified.
These include first order barriers comprising shales deposited as part of the transgressive
to highstand system tract. Second
order barriers are shales deposited in
response to lobe switching and minor
depocenter shifts within a given lowstand.
Third order barriers comprise shales
deposited within a given progradational
event and are associated with a shingling
architecture. Careful analysis
of production
history and perforation strategy, combined with
analysis
of recent drilling
results within a tightly constrained
sequence
stratigraphic framework has
revealed that significant bypassed pay
remains in this 40-year old field.
End_of_Record - Last_Page 17---------------