Schlumberger

Technical Paper: Determining Reservoir Stratigraphic Continuity Via Well Testing in Deepwater Gulf of Mexico, Fuji Prospect

Society: SPE
Paper Number: 77456
Presentation Date: 2002
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Abstract

The Fuji Prospect is located in the Green Canyon Blocks 505 and 506 approximately 180 miles south-southwest of New Orleans in a water depth of 4,280 ft. The discovery well, Fuji Well #1 (Green Canyon 506 Well #1) encountered 182 ft of oil pay in four Lower Pliocene age sandstones and was temporarily abandoned in 1995. The second well, Fuji Well 2 (Green Canyon 505 Well #1) was drilled in 1997. The well encountered 214 ft of oil pay, in sands equivalent to the pay sands and some wet sands seen in the discovery well.

Well tests were performed on two pay sands. Both tests had low productivity rates of less than 5000 BOPD and recorded pressure depletion. The 1st test indicated a small compartment. The 2nd test was inconclusive and could be explained by either a small compartment with high permeability or a larger compartment with very low permeability.

The Fuji Well 3 (Green Canyon 506 Well No. 2) was drilled next, in a structural position between Fuji Wells 1 and 2 in order to confirm stratigraphic continuity of the reservoirs. It penetrated 227 ft total of oil pay sands and 123 ft of oil pay in the shallower interval. The main field pay sand was the Magenta Sand, which was tested in Fuji Well 3 at a rate of 7,192 BOPD. The Magenta Sand in Fuji Well #3, however, showed pressure depletion during the test. Fuji Well #3 was temporarily abandoned in March 1998.

The Fuji #2 and Fuji #3 well test design and results will be presented. Pressure transient interpretation challenges and conclusions will be discussed. This work will also demonstrate the impact of well testing on determining stratigraphic continuity and reserves calculations.

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