. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. e would be impervious. A per-sistent stratum of salt water occurs beneath a shell layer at about950 to 1,000 feet above the top of the first important oil sand in thearea northwest of the flexure, but does not appear in any of the wellssoutheast of it. (See fig. 17.) Salt water is also encountered in someof the wells at horizons 150 to 200 feet and 650 feet above the oil zone. The oil zone proper varies in thickness from 150 to 500 feet andconsists of fine to coarse sand inter
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. e would be impervious. A per-sistent stratum of salt water occurs beneath a shell layer at about950 to 1,000 feet above the top of the first important oil sand in thearea northwest of the flexure, but does not appear in any of the wellssoutheast of it. (See fig. 17.) Salt water is also encountered in someof the wells at horizons 150 to 200 feet and 650 feet above the oil zone. The oil zone proper varies in thickness from 150 to 500 feet andconsists of fine to coarse sand interstratified with clayey shale and shell. The logs of a few wells near the flexure show no well-definedoil sand, but rather a series of thin productive sands interbedded withclayey and sandy shales. Whether the sand occurs as persistentlayers or as lenses is problematical, although from the evidence inhand it appears highly probable that it is present in both formswithin the area under discussion. It is known, however, that theuppermost important oil sand in the wells over a large part of the U. S. GEOLOGICAL SURVE. .1. CHARACTERISTIC THIN-BEDDED PLIOCENE SANDSTONE LOS ANGELES OIL FIELDS.
Size: 1685px × 1483px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidbulletinofunited309eldr
