Gamma Ray
0 200 0.1 gAPI
0.1
Deep Resistivity ohm.m
Bound Fluid Shell No. 1
1,000
Shallow Resistivity ohm.m
1,000
Depth ft
50 50 %
Oil %
0 0
Shell No. 1 DOI = 1.5 in.
Shell No. 4 DOI = 2.7 in.
Shell No. 8 DOI = 4.0 in.
T1 time
T1 time
T1 time
X,100
T1 time
T1 time
T1 time
X,200
T1 time
T1 time
T1 time
T1 time
T1 time
T1 time
X,300
T1 time
T1 time
T1 time
> Pinpointing OWC with station logs. After the inconclusive results from early attempts to use MR Scanner data to locate the OWC, stationary measurements were used. Station logs permit stacking of data to achieve higher signal-to-noise ratios. Continuous fluid analysis from Shell No. 1 (Track 2) shows oil throughout the interval, but the source is the OBM filtrate. A three-DOI sequence allows Shell No. 8 data to be acquired simultaneously with Shells No. 1 and 4. The deeper shell detects native oil when invasion is not too deep. The two top stations, at X,103 and X,138 ft, are in the oil leg and have a clear oil signature, with little or no water signal from all three shells. The three bottom stations, at X,142, X,165 and X,185 ft, are in the water leg, as evidenced by a strong free- water response. The absence of movable water in the upper two maps pinpoints the OWC at X,140 ft. Formation samples confirmed the interpretation.
In a third well, the petrophysicists acquired data from the 4.0-in. shell, and from the two shallower shells, using stationary measurements. Station data can be stacked to obtain a better signal-to-noise ratio. Continuous data were acquired from the 1.5- and 2.7-in. shells. As before, the data from the two shallower shells looked similar, with a strong OBM filtrate
response. However, the stationary data from the 4.0-in. shell clearly indicated free water in the water leg. Surprisingly, looking an additional 1.3 in. [3.3 cm] into the formation made a big difference in identifying the OWC.
Given the success of using the stationary measurements from the deep shell, which clarified the fluid distributions and explained vertical trends in the reservoir fluids, three-shell
Winter 2008/2009
measurements were added to the standard logging program. A first-of-its-kind triple-shell activation sequence to simultaneously measure all three DOIs in stationary and continuous logging modes was also introduced. This replaced multiple passes and multiple stations previously required to obtain three DOIs (above). Today, MR Scanner data play a critical role in the evaluation
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