LOS ANGELES DISTRICT: SALT LAKE FIELD. 195 
The region immediately southeast of the Salt Lake flexure, although 
supporting some small producing wells—one of which attains a depth 
of nearly 3,000 feet—does not compare in productiveness with the 
territory to the northwest. This condition may be explained on sev¬ 
eral hypotheses, the two most probable being either (a) that the Salt 
Lake flexure is accompanied by a fault which has dropped the pro¬ 
ductive sands on the southeast down out of reach of the drill, or 
raised them up to such an elevation that they were eroded away in a 
period subsequent to the faulting, or ( b ) that the continuation of the 
productive beds passes over the flexure (in this case an anticline) and 
down on the southeastern flank, but under conditions unsuited to the 
accumulation of oil in large quantities. The second hypothesis is 
represented diagrammatically by fig. 17. 
Faulting may be responsible for the cutting off of the upper oil 
sands immediately to the northwest of the axis of the flexure. If this 
be true it seems likely that the oil sand at the apex, which in fig. 17 
is correlated with the main oil sand of the productive field, should be 
correlated with the uppermost sands northwest of the fold. In this 
case the fault would have a downthrow of about 250 feet on the 
southeast. 
DEVELOPMENT. 
There are at present (February, 1906) between 75 and 80 produc¬ 
tive or drilling wells in the Salt. Lake field, belonging to the following 
companies: Salt Lake Oil Company, about 50 or 55; Arcturus Oil 
Company, 9; Utah Oil Company, 1 (these three companies con¬ 
trolled by the Associated Oil Company); A. F. Gilmore, 4; Pacific 
Light and Power Company, 4; E. P. Clark Oil Company, 7. In addi¬ 
tion to the wells mentioned above, there are several comparatively 
small producers, belonging to the last-named company. These are 
located near the northern half of the line separating secs. 28 and 29, 
and are pumped intermittently. The wells north of the Salt Lake 
flexure vary from 1,200 feet to oA^er 3,100 feet in depth, the deeper 
wells being as a rule the more productive and yielding the lighter oil. 
The individual Avells produce from 20 to o\ r er 1,000 barrels a day, the 
average being about 100 barrels. Owing to the tremendous gas pres¬ 
sure nearly all the wells “gush” when they first come in, and it is said 
that one of the deep wells produced about 18,000 barrels a day for a 
short time after its inception. The gravity of the oil varies from 11° 
to 22°, the heaviest oil coming, it is said, from an isolated sand below 
the main productive zone. The average for the field is between 16° 
and 18°. 
The large quantity of gas which comes from the wells is used mainly 
for the generation of power for operating and deA r elopment, although 
a small amount is used in the field for domestic purposes. 
