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40%. Recoverable gas reserves were estimated to be 26 Tcf (736 X lo9 m’).
These reserves are over the nose of a major “high” known as the Barrow
Arch (Figs. 13-3 and 13-4), which brings Lower Palaeozoic basement rocks to
within 800 m of the surface at Point Barrow (Morgridge and Smith, 1972;
Jones and Speers, 1976). The accumulations are due not so much to the arch
as to the unconformable Cretaceous mudstones that seal the truncated pre-
Cretaceous reservoir rocks far down the plunge of the Barrow Arch.
B WEST EAST B’
MOBlL
UNION A.R.Co. w. KUP St. A.R.Co.-EXXON
KOOKPUK No. 1 W. SAK R. NO. 1 NO. 3-11-11 PRUDHOE BAY St. No. 1
0 0 0 -SL
I I I
2000 SAGAVANIRKTOK FM. 2000
4000 4000
6000 6000
8000 8000
10.000 10,000
-
12,000 t 2,000
0 16miles
0 10 km
A W PRUOHOEBAY A’
STATE Wo 1
SOUTH PRUDHOE BAY HAMILTON BROS. NORTH
‘ TOOLIK FEDERAL NO. 1 STATE NO 1 PT. STORKERSEW
SAGAVANIRKTOK FM.
WESTSAK SANDS
VERT. EXAGGERATION 8-
Fig. 13-4. Cross-sections through Prudhoe Bay field. (Reproduced, with permission, from
Jamison et al., 1980, p. 296, figs. 7 and 8.)
