Great Falls tribune., 1921-11-22
DRILLING At .GENOU
WILL START SOON;
EQUIPMENT ON WAY
Well Site Pronounced in Apex
Of Pool Area by Geologist
3. F. HOyt.

Clearing Of the present storm viii
pared to start drilling its test well at
ing for the management. Material for
the rig and drilling equipment were
moved to the well site several weeks
ago, but operations have ben suspended
until now because of lack of water. A
water supply will be available by the
time weather conditions permit drill
ing to begin, Mr.. Sturm stated
Announcement of the company s
readiness to drill is made at a time
when report by Geologist 3. f. Hoyt
has added interest to the companys in
vestigation of the property. Geologist
Hoyt declares that the problems of
companies operating within the Sweet
Grass arch has not been that of de-
termining whether oil exists in this ter.
ritory, but in discovering the pooling
places. The report has particularly to
do with the well site selected by the
Northfield company. The report
reads:
Find lgneous Intrusion
my geological survey of Montana re-
Gently completed has dealt largely with
classification of the sedimentary strata.
special attention has been given to the
period of mountain uplift and it's re-
sultant pressure.
'"The systematic study has made pos
sible far clearer understanding of the
folding of the sedim entary. 1t has also
defined the shearage planes through
which poured forth igneous magma, so
prevalent throughout Montana
THE outstanding feature of this sur
vey is the now known pressure of an
igneous intrusion, which had its incep-
tion in the Bearpaw mountains and ex-
tended westward across the Sweet
Grass arch, connecting with the Rocky
mountains west of Choteau.
Detailed study shows the primary
line Of fracture to be of major char
acter and the resultant igneous intru-
sion, strong, constant and continuous.
The knowledge and definite facts Of this
intrusion should be of special interest
to you. 1t has direct bearing on the
present day oil placement of the entire
Sweet Grass arch, and especially so of
your Genou structure.
Locating Pools
"Our problem heretofore has not
been whether or not oil existed in the
arch. This is granted by all.) It has
been the absence of definite data to in
dicate the present day pooling area.
The slight dips and low arches hereto
fore known, were not considered suffi-
cient to overcome the hydrostatic pres
sure.
I'm view of these conditions, it has
been generally feared that all oil
~ r1rrsya h.
south.
The determination Of the igneous in
trusiOn will, therefore. set aside this
assumption: as the will Of igneous rock
from the granite 5000 feet
upwards through all the oil horizon
forms barrier beyond which neither
Dill or water could pass.
My surveys show that about 5000
square miles Of area gathers to the line
If this intrusion and that the folds of
the sedimentary strata are such that
he oil should be pooled at three areas
north Of and lying close to the intru-
sion; one of these areas is your Genou
structure.
Site in Apex Area
In my examination of this structure
lind the apex area embraces the site
II your present well. You may, there
ore. consider your present location
}. X.
The horizon exposed at the well To-
,atlon, is that of the cretaceous, some
iOO feet below the eagle; this makes
or a drilling depth Of $500 feet to
quadrant sands and some 1000 feet to |
he lower Kootenai.
With the arch now known to be
leeply locked by this igneous intrusion.
md this lock forming the south closure !
i your structure, every factor ap-
'ears present for strong production
md also for long lived field.
Certain, it is that the facts are snch
s to merit full consideration and fully j
variants expenditures necessary to
est out the structure"