66 
OIL-FIELD WATERS IN SAN JOAQUIN VALLEY, CAL. 
Table 5. —Analyses of ground water modified by action of oil, from wells in the Coalinga, 
, Midway, and Sunset oil fields, Cal . 
27 
28 
29 
30 
31 
32 
33 
14.0 
49.0 
45.4 
20.2 
44.6 
56.6 
77.4 
0 
0 
0 
0 
0 
0 
0 
82.6 
47.4 
22.4 
74.2 
39.0 
11.0 
15.6 
3.4 
3.6 
32.2 
5.6 
16.4 
32.4 
7.0 
75.7 
43.7 
67.4 
25.7 
58.3 
64.0 
1.2 
7.5 
2.4 
1.6 
15.3 
2.1 
1.2 
22.6 
a 1,003 
t 
a 807 
705 
460 
618 
a 93 
4,969 
21 
10 
33 
102 
17 
26 
124 
19 
31 
26 
109 
9 
104 
2.6 
45 
8 
144 
1 64.8 
f Trace. 
Trace. 
Trace. 
1 6 4.8 
/ 
\. 
3.1 
/ 
231 
377 
679 
53 
403 
103 
109 
54 
354 
241 
113 
210 
43 
6, 740 
cl,067 
c 555 
0 
0 
160 
c 77 
0 
1,366 
1,037 
693 
3,623 
52 
45 
60 
97 
34 
115 
9.6 
67 
2,497.8 
2,119 
2,690 
1,202.6 
1,959.1 
364.4 
14,025 
27 
2 
1.3 
a 48.3 
o48.2 
33.3 
47.1 
40.5 
o33.8 
46.0 
.6 
.1 
1.3 
.5 
.9 
1.8 
6.8 
2.3 
2.4 
10.7 
1.1 
.8 
9.3 
.5 
5.8 
5.5 
2.4 
5.3 
10.7 
15.3 
2.6 
13.0 
18.1 
.5 
1.7 
13.8 
7.4 
7.5 
9.3 
10.2 
38.2 
c39.5 
c 25.5 
0 
0 
8.3 
c 21. 7 
0 
24.3 
39.9 
19.4 
11. 3 
3.0 
18.41 
32.60 
8.91 
5.25 
34.14 
4.17 
106. 45 
53.40 
2.03 
7.34 
1.00 
1.80 
3. 74 
3.74 
.39 
1.48 
Trace. 
1.59 
.28 
.28 
3.49 
.56 
145.89 
123.88 
21.28 
PROPERTIES OF REACTION IN PER CENT. 
Primary salinity. 
Secondary salinity... 
Primary alkalinity.. 
Secondary alkalinity. 
Ratio of rSC >4 to rSCL+rCl. 
Ratio ofrC0 3 +rHC0 3 to rSC> 4 . 
CONSTITUENTS IN PARTS PER MILLION. 
Sodium (Na). 
Potassium (K). 
Calcium (Ca). 
Magnesium (Mg). 
Iron (Fe). 
Aluminum (Al). 
Sulphate (SO 4 ). 
Chloride (Cl). 
Carbonate (C0 3 ). 
Bicarbonate (HC0 3 ). 
Sulphide (S). 
Silica (SiC> 2 ). 
Hydrogen sulphide (H 2 S). 
REACTING VALUES IN PER CENT. 
Alkalies: 
Sodium (rNa). 
Potassium (rK). 
Alkaline earths: 
Calcium (rCa).1. 
Magnesium (rMg). 
Strong acids: 
Sulphate (rSOJ. 
Chloride (rCl). 
Weak acids: 
Carbonate (rC0 3 ). 
Bicarbonate (rHC0 3 ). 
Sulphide (rS). 
ANALYSIS AS REPORTED .d 
Sodium sulphate. 
Sodium chloride. 
Sodium carbonate. 
Sodium sulphide. 
Calcium sulphate. 
Calcium carbonate. 
Magnesium sulphate. 
Magnesium carbonate. 
Iron and alumina. 
Silica. 
0 Reported and calculated as sodium but includes potassium. 
& Fe 20 3 +Al 2 0 3 . 
c Reported and calculated as carbonate but probably in part bicarbonate. 
d In hypothetic combinations, in grains per U. S. gallon. 
Coalinga field: 
27. California Oilfields (Ltd.) well 16, sec. 26, T. 19 S., R. 15 E. Waterf rom 2,415 to 2,450 feet (above the 
oil). Analyst, Smith, Emery & Co., November, 1915. Authority, California Oilfields (Ltd.). 
28. Union Oil Co. well La Vista 4, sec. 4, T. 20 S., R. 15 E. Water from 3,191 feet, or about 400 feet 
above first show of oil reported. Analyst, E. H. Miller, April, 1911. Authority, Union Oil Co. 
29. Coalinga Homestake water well, sec. 26, T. 20 S., R. 14 E. Sulphur water from 336 to 354 feet, 
or at top of tar sand zone and 200 to 300 feet above the oil. Sampled by G. S. Rogers, October, 
1915. Analyst, S. C. Dinsmore. 
30. Santa Rosa Oil & Development Co. water well, sec. 12, T. 21 S.. R. 14 E. Sulphur water from 
2,077 feet, or about 600 feet below the oil. Temperature, 118* F. Sampled by G. S. Rogers. 
October, 1915. Analyst, S. C. Dinsmore. ^ * 6 ’ 
Midway and Sunset fields: 
31. Stratton Water Co. well 3, sec. 7, T. 32 S., R. 23 E. Probably a mixture of waters from above 
and below the oil. Temperature, 90° F. Sampled by G. S. Rogers, August, 1914. Analyst. 
S. C. Dinsmore. 
32. Midway Basin Oil Co. well in sec. 28, T. 31S., R. 24 E. Water from 2,980 feet. No oil encountered 
though possibly present at greater depth. Analyst, Standard Oil Co., November, 1910 
33. Union Oil Co. water well Diamond 2, sec. 13, T. 11 N., R. 24 W. Sulphur water from about 650 
feet, or about 100 feet above the oil. Sampled by G. S. Rogers, September, 1915, Analyst, S C 
Dinsmore. * ’ 
