Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAboutGMC Data Report No. 053BRICHFIELD OIL COMPANY
WIDE BAY UNIT #1
ALASKA PENINSULA
SCANNING ELECTRON MICROGRAPHS
OF
SELECTED RADIOLARIANS
Twenty (20) Samples of ditch cuttings at 100'
intervals between 100 and 2300' were selected for scan-
ning electron microscope (SEM) examination of radiolar-
ians. Specimens were chosen from picked and unpicked
foraminifera samples, examined in the SEM, and returned'
to separate foraminifera slides according to procedures
described below.
Cover glasses were mounted on SEM stubs with
a water-soluble adhesive (gum tragacanth). A drop of
dilute solution of polyvinyl acetate (PVA) in methanol
was spread over the cover glass and allowed to dry, leav-
ing a thin film of PVA. Specimens were arranged on the
cover glass in rows with a picking brush. The stub was
then heated on a hot plate to soften the PVA and allow
the specimens to sink slightly into it. Upon cooling, the
specimens adhered firmly to the cover glass.
Specimens were arranged on the cover glass in
ross starting generally with spheroidal and discoidal
forms and ending with conical forms. For reference pur-
poses rows were considered to be numbered from top to
bottom, and specimens within rows from left to right.
·
Thus each specimen was assigned a location number in the
form: row number/specimen number. The sketch below
illustrates a typical arrangement of specimens on a cover
glass.
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Row 1
Row 2
Row 3
The stubs were coated with gold-palladium in a
sputter coater and placed in the SEM. Photographs were
taken on Polaroid t~pe 665 positive-negative film. Each
photograph bears the well name, footage interval~, speci-
men location-number and magnification. Most specimens
were photographed'at approximately the same magnification.
In a few cases a specimen was photographed at a lower mag-
nification in order to fit ~t within the format.
After Completion of the SEM work, the gold-
palladium coating was removed with agua regia from several
samples near the bottom of the studied sequence. However,
when etching of some specimens was observed, this practice
was discontinued and the coating left intact. Cover
gl~sses, with specimens intact, were then removed from the
SEM stubs and transferred to labeled depressions in card-
board foraminifera slides. Specimens can thus be re-
examined in the light microscope, using the location-
number to find the specimen corresponding to a particular
SEM photograph.
An attempt was made to provide a general over-
view of the range of morphotypes in each sample. However,
Specimen No. 2/4
-2-
preservation is poor ih these Wide Bay samples and, in
many cases, the SEM revealed little or not detail not
observable in the light microscope. Therefore, not all
the mounted specimens have been photographed, particu-
larly in the lower part of the studied range where down-
hole repetition was prominent.
Prints of the SEM photographs obtained in this
study are arranged in this notebook according to sample
number starting with the highest sample.
-3-
LIST OF PLATES
100- 200'
200- 300'
300- 400'
400- 500'
500- 600'
600- 700'
700- 800'
800- 900'
900-1000'
1000-1100'~
1100-.1200'
1200-1300'
1300-1400'
1500-1600'
1600-1700'
1700-1800'
1800-1900'
1900-2000'
2200-2300'
ROCO Wide Bay Unit #1
Plate(s)
1, 2
3, 4, 5
6, 7
·
8, 9
10
11
12, 13
14
15, 16
17, 18, 19, 20
21, 22
23, 24
25, 26
27
28
29
3O
31
32
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'q_3
,16
