Petroleum Resources and Industries 

 Santa Clara Valley District. — The Santa Clara 

 Valley district includes several isolated fields or 

 pools situated in the mountains of southern Ventura 

 and northwestern Los Angeles counties, 30 to 90 

 miles northwest of Los Angeles. The principal 

 fields are the Ojai Valley, Sulphur Mountain, Sespe, 

 Hopper Canon, Modelo, Bardsdale, Montebello, Tor- 

 rey Canon, Pico Cafion, Newhall and Simi. The 

 total proven territory is about 6895 acres. The 

 wells vary in depth from 250 to 3700 feet, and in 

 productive capacity up to initial flows of 500 bar- 

 rels daily. There are at present 430 producing 

 wells in the district, with an average daily pro- 

 duction per well of 5.9 barrels. The oil ranges 

 from 11° Beaume (0.9929 sp. gr.) in the Ojai field 

 to 38° Beaume (0.8333 sp. gr.) in the Simi and 

 Montebello fields; most of the oil now produced is 

 of the higher grades. The oil is obtained from 

 sands ranging in age from the Tejon (Eocene) to 

 the Fernando (Miocene-Pliocene) ; the productive 

 areas are small and are usually associated with 

 anticlines or nodes on anticlines, which in some 

 cases are very steep-sided. 



Los Angeles District. — The sight of oil derricks 

 distributed thickly among the residences of a great 

 city is the unique feature of the Los Angeles oil 

 field. The producing territory extends from a 

 point in the northern part of the city near the 

 Los Angeles River, westward for about five and a 

 half miles to what is known as the Salt Lake field. 

 The area includes about 1722 acres. In the City 

 field proper the wells vary in depth from 500 to 

 1200 feet, and the oil from 12° to 19° Beaume 

 (0.9859 to 0.9396 sp. gr.). The initial production 

 of the wells varies from 10 to 200 barrels; the 

 average now is about 2.4 barrels per day. The 

 wells in the Salt Lake field vary from 1200 to over 

 4000 feet in depth, the average gravity of the oil 

 being between 16° and 18° Beaume (0.9589 and 

 0.9459 sp. gr.). The initial production of individual 

 wells in this field has run as high as 5000 to 10,000 

 barrels per day. There is a total of 700 wells now 

 producing in the entire district, the average daily 

 yield being 8.9 barrels. The oil comes from the 

 lower Fernando formation and upper Monterey 

 (upper Miocene), the productive sands lying nor- 

 mally as a monocline, in some cases faulted near the 

 outcrop and in others complicated by minor anti- 

 clinal cross folds. 



Puente Hills District.— The Puente Hills district 

 has come forward recently as one of the richest 

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