7s

not been mapped in detail, but several have been outlined sufficiently
to show their extent and type. .Before a structure that exposes Tri-
assic strata is drilled more work should be done on the stratigraphy
of the underlying Palaeozoic rocks to determine the presence of source
beds and reservoir beds in these rocks. A well located on one of the
folds in Cretaceous strata should test the sands in the Bullhead group
and underlying Mesozoic strata. The accessibility of the area by the
Alaska Highway and the presence of various types of folds in beds that
contain source material and possible reservoir beds should warrant ©
more detailed geological investigations, followed by test drilling.

Wells Drilled at Fort Nelson Airport

Three wells have been drilled at the Airport for water by
the United States Army Engineers. The first well, Fort Nelson No. 1,
reached a depth of 521 feet and was wholly in glacial drift. It en-
countered a pocket of gas and was abandoned. Tho second woll, Fort
Nelson No. 2, was drilled to a depth of 1,451 feet. It encountered
the base of the’ drift between 720 and 730 and a flow of gas estimated
to be about 150,000 cubic feet at a depth of 1,010 feet ina fine-
grained sandstone. A supply of water was obtained in a coarse gravel
at the base of the drift and rose to within 250 feet of the top.
Seven-inch casing was set at 730 feet, but not cemented. The casing
was plugged at 720 feet and perforated betwoen 610 and 690 feet. The
well makes some gas, resulting in muddy water. An analysis” of @

Analysis by Division of Fuels, Bureau of Mines, Department of Mines
and Resources. — iY di has

PSR LAMA a en iS NS PS aa

sample of the gas is.as follows: Nae
Se a Per cent by volume

Methane | © egia1

Ethane . 0.18
Propane pate Nil
Butanes ~ _ Mil
Pentanes : i OeLO
Carbon dioxide : 0.28
Oxygen 0.91
Nitrogen _ 012
Helium ; Trace
Total 100

Specific gravity (Air= 1.000) 0.575
‘Heating value at 760 mm. and 60°F.
B.T.U. per cue ft.=999 pipes

The third well, Fort Nelson No. 3, was drilled only a
short distance from No» 2 with the object of utilizing the gas struck
in No. 2 well for fuel.e It was, however, drilled to a depth of 706
feet and finished off as a water well. Cores were not taken con-
tinuously, but the impression obtained from discussions with the
driller, Mr. J. K. Hawkins, was that the beds between 485 and 660
feet consist entirely of bedded silts and clays. .