Page 196 - Basic Well Log Analysis for Geologist
P. 196
LOG INTERPRETATION CASE STUDIES
. INTERVAL
SPONTANEOUS - POTENTIAL TRANSIT TIME
microseconds per faot
millivolts
€———_—_____- 'ncreases
20 T2LR, Ro
- } 4 +
7O
130
GAMMA RAY
Figure 86. Sonic log with spontaneous potential log Pennsylvanian upper Morrow Sandstone, Anadarko basin.
Note:
The high interval transit time (At = 81 sec/ft. at 7.446 ft) which indicates high sonic porosity. See tracks #2 and
#3 between 7.440 and 7,452 ft.
18]
