Page 35 - The Geological Interpretation of Well Logs
P. 35
- TEMPERATURE LOGGING -
nese rapid, as opposed to conduction effects which are slow
(Alm, 1992).
o80 The use of the continuous temperature log to detect
r 27
r fluid movement is most common in production logging
(Hill, 1990) but the same principles can be used effec-
2810 tively in un-cased (open hole) exploration wells. This is
not generally the case at present.
2870
pre-frac
lL temperature L 930
r
post-frac a
temperature |
2990
; e
®
a
4
+ + 3050 =<
=
top of fractures
a
2E- — — FP ~ a
2 a fracture aii
3 Fl
anomaly
Ek
D>
a
1
3470
aor — 93° 108° —T 135°
121°
Temperature, °C
Figure 3.11 A borehote temperature anomaly created by
hydraulic fracturing. Borehole mud enters the created
fractures causing a cool anomaly which did not exist
before fracturing was done (re-drawn from Hill, 1990
after Dobkin, 1981).
