File:Annual report of the State Mineralogist for the year ending (1883) (14591471238).jpg

Identifier: annualreportofst10cali (find matches)
Title: Annual report of the State Mineralogist for the year ending ...
Year: 1883 (1880s)
Authors: California State Mining Bureau
Subjects: California State Mining Bureau Mines and mineral resources Gold mines and mining Geology Mineralogy
Publisher: Sacramento : California State Mining Bureau
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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rob-able line of cleavage. Of these, C. S. O. W. No. 8 (the only one findingany thickness of oil sand) was producing fairly at the time it wasplugged, as above stated. P. C. O. No. 11, after being pumped con-stantly for over nine years, is now (July, 1890) producing 46 per centas much oil as when first completed; and Hill No. 3, while producingfairly well, was flooded with water through the action of some chemicalin the water which ate through the iron casing. Of the two last named,neither show sufficient oil sand to account for its production or stayingqualities, P. C. 0. No. 11 having but twenty-five feet, and Hill No. 3none at all. Both got their oil in shells, a term by which oil drillers designatethin laminae of sand and shale alternating with a hard, impervious rock.Both of these wells being so close to the probable line of the break, itseems quite likely that they have drawn their oil supply, through theseshells, from the large body of oil sand on the north side (see Plate 11).
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OILFIELDS IN pHYSlM LOS ANGELES COUNTY. 285 Of the five dry holes drilled on the south side, Nos. 10, 11, and 16(C. S. 0. W.) all failed to go deep enough to strike the main oil sand,conceding a fault of eight hundred and ninety-five feet, and a dip of 125percent. While Nos. 10 and 16 both found a little oil, it seems quiteprobable that this leaked through some crevice from the oil sand on thenorth side of the break, as shown in Plate 9. As to the remainingwells (Hill Nos. 1 and 2), there is no formation reported sufficient todiagram, nor are there sufficient data regarding the north side of thebreak at this point to give any reliable clew to its location. On the north side of the break, the greatest horizontal breadth ofthe developed field is from C. S. 0. W. No. 2 (which is supposed to bealmost in the line of cleavage) to C. S. 0. W. No. 9, a distance of eighthundred and forty feet (see Plate 9). Following the angle of the oilsand, this would give, between the points pierced by thes

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