118 SANTA MARIA OIL DISTRICT, CALIFORNIA. 
Analyses and texts of six samples of oil from wells near Santa Maria —Continued./ 
RESULTS OF DISTILLATION. 
Water, percent by volume.. 
Benzines, boiling point un¬ 
der 150° C. (302° F.): 
Percent. 
Kerosene, boiling point 150° 
0.-250° C. (302° F.-482°F.): 
Per cent. 
Lubricants, boiling point 
250° 0.-350° C. (482° F.- 
662° F.): 
Per cent. 
QraTit Hlaum“ c .::::::::: 
Lubricants, boiling point 
above 350° C. (666° F.): 
Percent. 
r<u 1 - (Baum6. 
Asphaltum: 
Percent. 
No. 3. 
* 
No. 4. 
No. 5. 
No. 6. 
No. 7. 
No. 13. 
1.2 . 
0.2 
Trace. 
Trace. 
Trace. 
10.8 
24.5 
.745 
60° 
22.1 
.740 
61. °2 
20.2 
.740 
61. °2 
23.5 
.752 
52° 
18.5 
.752 
52° 
16.8 
.742 
60. °8 
21.5 
.8345 
39 
20.5 
.821 
41.8 
21.5 
.818 
42.5 
18.7 
.823 
41.4 
18.5 
.822 
41.4 
22.1 
.843 
37 
19.0 
.905 
25.3 
22.8 
.889 
28.2 
19.2 
.898 
26.6 
20.0 
.897 
26.6 
25.5 
.895 
27 
17.2 
.899 
26.4 
23.0 
.917 
23.2 
22.7 
.905 
25.3 
20.3 
.924 
22 
25.5 
.917 
23.2 
22.5 
.903 
25.6 
16.2 
.906 
25 
10.8 
11.7 
8.8 
12.3 
15.0 
16.9 
ASSOCIATED HYDROCARBONS. 
NATURAL GAS. 
Throughout the Santa Maria district wherever any oil has been found 
it is invariably accompanied by considerable quantities of natural 
gas; indeed, this form of hydrocarbon is somewhat more widely dis¬ 
tributed than the oil, occurring in many places in the shale above the 
oil zones and in some wells which have yielded no petroleum. The pres¬ 
sure of the gas varies from zone to zone and from well to well. The 
greatest pressure so far recorded was in Hartnell well No. 1, where, 
according to Mr. Orcutt, it was over 400 pounds per square inch dur¬ 
ing the initial flow of oil and gas. Most of the gas is utilized for the 
generation of heat or of power direct in gas engines. Some of it is 
utilized for domestic purposes in the field and the immediate vicinity. 
ASPHALT. 
Great deposits of asphalt are associated with the petroleum-bearing 
and later formations over certain portions of the Santa Maria dis¬ 
trict. The asphalt (in the broader sense of the word) within the 
district occurs in several different ways—as veins penetrating the 
Monterey shale and later formations; as impregnations of the shale, 
sands, or gravels in or overlying the Monterey; and as more or less 
impure effusions at the surface. The more important deposits are in 
the hills northwest of Arroyo Grande; in the region of Asphaltum 
and La Zaca creeks, east of Sisquoc; in Graciosa Ridge; and in the 
vicinity of Redrock Mountain. These deposits have been described 
