Geoscience Reference
In-Depth Information
Table 2. Depth of identified fractures zones in shallow bore wells by geophysical and
geological information in Wailpally watershed, AP, India.
Resistivity log
Bore well
Lithologic
number
information
EC log
LN
SN
PR
1
Fractured
57.00-60.00
55.00-58.00
54.30-55.50
56.10-57.20
granite at
61.00-62.00
58.10-59.30
59.30-61.50
50.50-59.10
2
Minor
39.00-41.00
38.30-39.70
38.10-39.20
37.30-38.70
fracture at
49.00-51.00
48.70-49.10
50.20-52.40
3
Fractured
44.00-46.00
46.10-47.30
45.20-46.30
47.50-48.80
granite at
48.20-49.70
45.60-48.75
4
Semi-weathered
34.00-38.00
39.70-41.10
40.20-42.30
42.50-44.00
granite at
46.00-48.00
35.75-36.10
50.00-52.00
50.00-55.20
Table 3. Depth of identified fractures zones in shallow bore wells by geophysical and
geological information in Sadras watershed, AP, India.
Bore
Resistivity log
well
Lithologic
number
information
EC log
LN
SN
PR
1
Fractured
23.00-25.00
22.30-23.80
25.70-27.00
20.80-23.70
Charnokite
29.00-31.00
32.50-33.60
27.10-28.30
at 20.75-24.10
2
Minor fracture
25.00-27.00
28.50-30.20
30.70-32.50
21.10-24.20
at 24.10-28.70
29.00-31.00
40.50-42.70
43.60-45.80
43.73-46.90
40.20-44.75
41.00-43.00
3
Fractured
22.00-24.00
20.70-22.90
23.10-24.20
38.50-46.10
Charnokite
37.00-39.00
40.10-41.20
38.20-40.10
45.20-48.80
at 38.50-440.20
4
Semi-weathered
27.00-31.00
30.50-32.20
30.10-31.20
30.20-35.80
Charnokite
45.00-47.00
47.10-49.20
45.20-47.10
at 25.10-28.80
44.50-48.10
The applicability of EC logs technique has been tested, in particular in
hard rock areas of India, first time. The method and their results have been
validated against the results obtained by other geophysical and geohydro-
logical techniques in these areas and in particular in above-mentioned bore
wells. The geophysical techniques such as self-potential logging, point resis-
tance logging and gamma logs
15
and hydrological techniques such as water
