The San Francisco call., 1910-04-27

600 barrels, or a trifie more than . per
cent. AT last years rate of extraction.
when something more than I4.0OO. 900
barrels were taken from the district. il
VIII require zoo years 10 exhaust the
field.
With the extension o. the Coslinga
oil fed and the prospective addition Of
a large area 70 the proved belt, the
report recently compiled for the gov
ernnent by Ralph Arnold and Robert
Anderson assumes z pertinent interest
Speaking on the general topic OF future
development. the report says:
a depth Of $500 feet below the sur
face has been arbitrarily taken as the
maximum 10 which Il is possible 10
driu ny present methods in The region
under discussion, as this IS about the
maximum depth OF holes in California
which have been drilled with a stand
ard rig Il may be possible 10 go
deeper than this. but for the present
this limit seems sufficiently great
Whether or not well can be profitably
drilled depends upon SO many factors
such as quantity of oil produced com
pared with cost Of drilling. price OF oil.
etc. tAa1 local conditions must deter
mine the result I'm each specific case.
E0CENE SHALEs DEVELOPED
of The region northwest Of the east
side FIELD tie report says
The writer's have examined the
country only ss far north as the middle
% section 19-1S-15. but up TO this
point -Le shales OF The TETON ieocene1
were found well developed. and II is
q 7erefCre believed that the everything mi
ccene sands VIII be found as productive
cs iu tle region farther south The
steeperinE Of the dip Of the BEDS IN this
Ur1eFelopeC territory viii necessarily
narrow the productive ground mate
rally. decreas nE IL TO a band less than
TWO -les V-lGe. whereas southwark in
t1e middle Of the eas1wide field. where
Tie dip IS approximately only Is de-
crees. -le width Of the productive belt
Is ore- three miles.
OF rhe east side extension the geolo-
Gis-s say
III should be bOrneein mind that the
lower part and what IN section IS and
The western part Of sections - and p
IS The richest part1 Of the oil measures
mas not been tested in those wells
tar1hest down The dip and should Weld
good returns for The extra cost Of
deepening i water is not encountered
- aT the greater depth, and there Is no
evidence at present indicatin that
water exists AT The base Of the oil IN
This area
Many OF the theories set forth in the
report have been given practical appli-
cation within The last few weeks The
report continues:
Within the area Of the shale and
inuerbedded sandstone OF The TETON
leocene) lying between the cretaceous
fChicoD beds on the west and the over
lying VaQuerOs dover miocene) sand
stone on the east and extending from
% and 90. 1915. il Is believed that
favorable locations FOR productive wells
yet remain undeTelOped. Surface indf-
cations lead 70 The belief that wherever
IN this area the sands fnterbedded with
the shale OF the TETON formation are Of
z porous character they contain appre-
CishIe and in some cases probably com
mercial quantities OF petroleum al
available depths. AS the quality Of the
oil obtained from the TETON sands is.
usually considerably higher than that
found in the uiocene. small producers
IN the TETON area should pay where
the same production would involve a
loss elsewhere. Il is believed that q
well site so chosen that the prospective
sand would be encountered at 500 feet
or more below the surface would be the
most favorable for exploiting the Teton
territory"
ANTICLINE RIDGE PRODUCTIVE
Passing TO the anticline ridge and
the Guijsrral hills, Arnold and Ander-
son say
Throughout its entire length along
the southwestern edge OF the derel-
Oped territory in the east side field. The
axis OF the Coalinga anticline dips
southeast al about degrees until in
The northwestern part OF section 2
20-15. il assumes an angle Of approxi-
mstely four degrees The territory
along this comparatively low dipping
portion Of the anticlfne has heen
proved productive as far southeastvvard
as the middle Of the northwest quarter
section OF section 2-20-15- Southeast
ward from this last mentioned locality
The indications for productive wells are
good.
Taking up the west side fields. the
experts assert.
There are no known reasons .af rres-
ent for believing that any Of the Ter
ritory in the main portion Of the west
side Held under which the productive
measures lie at a greater depth than
500 feet are unprOductive Local con
oltions, such as the extreme tbinness
OF the shale or clay separating water
from oil sands may make the msninu-
lauon OF certain wells more or less
difficult or possibly unsuccessful. but
there is no evidence Of bottom or
edge" water IN any Of the wells so
far drilled that condemns any of the
territory generally considered as
proved On the contrary. evidence is
available Indicating that in MANY Of
the wells which have been penetrated
but short distance into the oil bear
ing zone there are underlying and IN
touched sands even more productive
than those already developed
REEF RIDGE PROMISING
OF the Reef ridge south 10 Dagany
gap. the report says:
The great mOnocline Of tertiary
beds. which TANKS Reef ridge on the
east and forms the kreyenhagen hills.
Is unoerlain by the TETON formation
from & point al least as far north as
Sulphur Spring canyon to the head of
the =eao OF Little Tar canyon. Through
OUT nearly the whole extent Of this
TETON band il shows unmista kable signs
Of its petroleum contents Many oil
seepages also occur from the vaoueros
sands everything the eocene. SO that
there is no doubt as TO the presence of
petroleum throughout practically the
whole length OF the region under dis
cussion. Furthermore, productive wells
on canoas creek in Big Tar canyon and