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: Understanding Wilcox 1 and Wilcox 2
Reservoir Distribution at Jack Prospect
(It’s possible that you don’t know Jack!)
Chevron
Chevron’s 2004 Jack Prospect oil discovery encountered more
than 350 feet of net pay oil sands in the
Wilcox (Upper Paleocene) in approximately
7,000 feet of water in the Gulf of Mexico.
Chevron cored the Wilcox 1 reservoir, which
was interpreted to represent truly unconfined
basin-floor turbiditic sheets. The following
year Chevron drilled Jack #2 well
approximately a mile from the #1 and cored
both the Wilcox 1 and Wilcox 2 reservoirs. As
in the Jack #1
well
, the Wilcox 1 cores were
interpreted as unconfined sheets, but the
Wilcox 2 core was interpreted as confined channel deposits. We
used commonly recognized criteria to interpret and differentiate
between unconfined sheet elements and confined channel elements.
Sub-salt seismic data in the Jack area are generally poor and lack
the resolution to effectively characterize the reservoirs.
Consequently, we used core analysis
,
log
correlation and depositional
models to characterize the Wilcox 1 & 2 reservoirs. Both
channel and sheet elements are part of a larger 3D body interpreted
to be a distributary lobe. The distributary lobe
depositional model is the result of previous outcrop research and
subsurface analogs. Using the interpreted
elements and previously derived aspect
ratios (width to thickness ratios), we were
able to provide dimensions and reservoir
distributions for each element, as
well
as for
the larger distributary lobes.
In 2006, the Jack #2 well
was successfully
tested and sustained a flow rate of more
than 6,000 barrels of crude oil per day.
End_of_Record - Last_Page 25---------------