76 
OIL-FIELD WATERS IN SAN JOAQUIN VALLEY, CAL. 
somewhat lower. In parts of the McKittrick field water of the mixed 
type, whose original source is generally believed to have been below 
the oil, has flooded the oil measures. About 30 analyses of the water 
obtained from oil wells in this field have been made available for the 
writer’s study. All of them are very similar and belong to the same 
type, which is represented by analysis 89 (Table 14, p. 85). 
Table 10. —Analyses of mixed meteoric and connate water altered by action of oil, from 
oil wells in the Coalinga and Midivay oil fields, Cal. 
60 
61 
62 
63 
64 
65 
66 
PROPERTIES OF REACTION IN 
PER CENT. 
Primary salinity. 
54.8 
60.2 
74.4 
56.6 
67.6 
74.8 
83.6 
Secondary salinity. 
0 
0 
0 
0 
0 
0 
0 
Primary alkalinity. 
35.6 
36.0 
22.8 
42.2 
30.2 
24.4 
11.8 
Secondary alkalinity. 
9.6 
3.8 
2.8 
1.2 
2.2 
.8 
4.6 
Per cent of rS 04 in rS0 4 -f rCl... 
* 
0 
1.0 
0 
Trace. 
.01 
0 
.01 
CONSTITUENTS IN PARTS PER 
MILLION. 
Sodium (Na). 
Potassium (K). 
1 2,273 
/ 2,951 
1 77 
1,885 
20 
°1,749 
1 3,315 
/ 3,140 
24 
a 7,090 
Calcium (Ca).. 
77 
19 
17 
10 
19 
9.3 
73 
Magnesium (Mg). 
81 
53 
18 
6.3 
28 
3.6 
135 
Iron (Fe). 
22 
Trace. 
Trace. 
} 6 2.6 
f Trace. 
} 6 13 
Aluminum (Al). 
Sulphate (S0 4 ). 
0 
37 
0 
0.7 
. 
4.9 
0 
4.5 
Chloride (Cl). 
2,119 
2,960 
2,170 
1,543 
3,526 
3,662 
9,566 
Carbonate (Co 3 ). 
0 
192 
120 
cl, 001 
0 
'219 
c1,588 
Bicarbonate (HC0 3 ). 
3,013 
3,013 
1,049 
2,903 
1,708 
Silica (Si0 2 ). 
61 
119 
' 75 
33 
68 
40 
44 
6,116 
7,891 
4,822 
4,345. 6 
8,390.9 
7,939.9 
18,513. 5 
Carbon dioxide. 
18 
0 
REACTING VALUES IN PER CENT. 
Alkalies: 
Sodium (rNa). 
/ 47.4 
48.3 
a 49.4 
/ 49.4 
a 47.7 
Potassium (rK). 
> 45. Z 
f .7 
.3 
) 48.9 
l 2 
Alkaline earths: 
Calcium (rCa). 
1.8 
.3 
.5 
.3 
.3 
.2 
. 6 
Magnesium (rMg). 
3.0 
1.6 
.9 
.3 
.8 
.1 
1.7 
Strong acids: 
Sulphate (rS0 4 ). 
0 
.3 
Trace 
o 
Chloride (rCl). 
27.4 
29.8 
37.2 
28.3 
33.8 
37.4 
41.8 
Weak acids: 
Carbonate (rC0 3 ). 
0 
2.3 
2.4 
c 21. 7 
0 
2.6 
c 8.2 
Bicarbonate (rHC0 3 ). 
22.6 
17.6 
10.4 
16.2 
10.1 
a Reported and calculated as sodium but includes potassium. 
6 F 62 O 3 +AI 2 O 3 . 
c Reported and calculated as carbonate but probably in part bicarbonate. 
Coalinga field: 
60. Section Seven Oil Co. well 5, sec. 7, T. 20 S., R. 15 E. Sampled by S. H. Hain, October, 1915. 
Analyst, S. C. Dinsmore.. ’ 
61. American Petroleum Co. well 2 N, sec. 30, T. 20 S., R. 15 E. Water from 1,916 feet, or 3 feet below 
main oil. Sampled by T. J. Crumpton, August, 1912. Analyst, S. C. Dinsmore, November, 
iy i5» 
62. American Petroleum Co. well 21, sec. 30, T. 20 S., R. 15 E. Water from a short distance above 
the producing oil sand (“upper edge water”). Sampled by T. J. Crumpton, August, 1912 
Analyst, S. Q. Dinsmore, November, 1915. & ’ 
63. Nevada Petroleum Co. well 1 sec. 20, T. 20 S., R. 15 E. Water from 3,305 feet, or about 25 feet 
below lowest oil. Analyst, Smith, Emery & Co. Authority, Nevada Petroleum Co. 
64 ' L Q C 1 i e A’J n e L 1S d and Vfi 6 ’ TaA 1 S P 3 V 15 E - Water from sand probably in oil /.one. 
Sampled by G. S. Rogers, October, 1915. Analyst, S. C. Dinsmore. 
Midway field: 
65. Associated Oil Co. well 1, sec. 35, T. 31 S., R. 22 E. Water from 1,495 to 1,727 feet, or about 100 
lyst ^hase l'ahne ? 1 Sand ' Tem P erature > l20 ° F - Sampled by G. S. Rogers, July, 1914. Ana- 
66 . North American Oil Consolidated Co. well 71, sec. 16, T. 32 S., R. 23 E. Water probably from 
North AmeS OUfoZli&rtCo^ m * ySt ' Sm “ h ’ Emery * Co - March ’ A ^ority, 
