Page 231 - Well Logging and Formation Evaluation

Solutions to Exercises 221

1. From this the FWL is picked at 646m. Note that because the sand is
of reasonable quality no significant gap between the FWL and OWC
would be expected. The oil density is 0.85g/cc. The water density is
1.02g/cc
2. Oil bearing
3. In order to avoid early water production it is recommended to use the
tight streak at 638m to help avoid early water breakthrough. The fol-
lowing interval is therefore proposed: 622.5–638m (reference density
log). The final evaluated logs should look like this:

DT
140 US/FT 40
CAL NEUTRON RES_DEEP SHPOR
8 INCH 18 .45 FRCT –.15 .2 OHMM 2000 0 M .25
CR “DEPTH” DENSITY RES_SHAL POR
0 API 100 1.95 G/CC 2.95 .2 OHMM 2000 0 M .25

ZONE1
0
0
ZONE2_0IL
625

ZONE2_WATER
650
ZONE3
0

675