The Kevin review. [volume] (Kevin, Mont.) 1922-1929, 1926-07-15
Will DRILL new FOLD

to be penetrated by the drill 1t is
composed of grey and buff coarse,
cross-bedded sandstones. massive at
the top but becoming thinner bedded
father down, and grading into shale
at the very base. 1t is a fresh water
and land formation.
Colorado Shale:
Lying Immediately below the Vir-
gelle Sandstone are the Colorado
shales which constitute a thickness of
about 1000 feet The upper half is
as black Marine. Shales, while the
wer half contains several sandstone
beds which. under proper structural
conditions, contain oil in some of the
fields of Montana and Wyoming
While a very good showing of oil has
been found at this horizon, in several
OF the wells drilled in the Kevin-Sun-
burst field, it has not produced in
commercial quantities. Stili the hope
is quite gene al that this horizon will
] be productive in parts of the field.
it has not produced in commercial
: quantities. Still the hope is quite
general that this horizon will be pro-
ductiye in parts Of the field. Several
good gas wells have been found in
! these sands in the KevinlSunburst
! field.
! fhe Kootenia formation is fresh
water foriation made up of grey
sandstone and shaie with alternating
beds of reddish brown clay shale. The
log of wells drilled in this locality
show the Kootenai to be about 400
feet thick and to contain two beds of
porous sandstone ranging in thick
ness from ten to fifty feet. About
ten of the producing oil wells in the
Keyin-Sunburst field get their oil
from these sands; also the largest gas
flow released in the field comes from
this horizon
The Ellis formation lies immedil
atcIy below the Kootenai 1t is COM
posed OF buff colored limestone and
sandstone. Most of the producing
wells in the Kevin-Sunburst district,
as well as the heaviest production, is
found at this horizon. 1t is about
200 feet thick
Madison Lime:
The Madison Lime which is over
800 feet thick lies next below the Ellis
The Troy-Sweetgrass Oil company
drilled a test hole with diamond
drill through the Madison and several
feet into the underlying De- |
vonian beds where the best showings |
of oil encountered in this we'll was |
found. The California Standard Oil
company is now drilling test hole
with a Standard rig with a view to
exploring the beds underlying the |
Madison
STRUCTURE
THE Barthelote Dome covers about |
5000 acres and is almost entirely |
within the area covered by the leases
you hold. The dips are about one de-
gree. No faulted conditions of the
beds was found.
The upcupping of the beds at this
point is due to the stress caused by
the igneous upheayal that formed the
Sweet Grass Hills north and east of
the structure. No igneous intrusions
appear nearer than four miles from
the crest of the dome
Conditions for Drilling
A good grade of coal can be hauled
from a mine five miles north of the
structure Water in abundance can be
carried in bitches or piped from
springs and reservoirs on the land.
Drilling machinery, etc, can be haul
ed to this structure from Dunkirk, on
the Great Northern railroad a dis
tance of about 35 miles over very fair
dirt roads with no appreciable grade.
Conclusions and
recommendations:
In brief, the Barthelote Dome is a
minor upwarping of the unfaulted Gre
aceous beds of the Sweet Grass Arch
The magnitude of Sweet Grass Arch
allows of an area for accumulation so
rast as to make it quite probable
hat oil has accumulated in this minor
ield. The marked success following ,
ihe drilling of wells over several
townships in the nearby Kevin-Sun-
hurst field lends confidence to the
writer's belief that oil will be found
il the. Barthelote Dome. II
1t is recommended. that well be I
d'illed near the center of Section IL, y
SO North of Range 2 East, Is