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Oil and Gas Seeps in Alaska. North-Central Gulf of Alaska.

Blasko DP
NTIS: PB 259 325 :123 pages
The Bureau of Mines investigated two areas of oil and gas seeps in the north-central Gulf of Alaska--Katalla River to Bering River and Cape Yakataga to Yakutat Bay to determine (1) whether previously reported seeps are still active, (2) the characteristics of the seeping hydrocarbons, and (3) the amount of bitumen contained in the drainage leaving the seeps and entering the Gulf of Alaska. Thirteen separate oil seeps, six bitumen deposits, and eight gas seeps were located, sampled, and analyzed. The oils ranged from 35.2 Deg to 14.1 Deg api gravity and had sulfur contents from 0.53 to 1.31 wt-pct. Bitumen samples had api gravities from 2.4 Deg to 14.6 Deg and sulfur contents from 0.28 to 0.88 wt-pct. Gas samples had specific gravities ranging from 0.577 to 0.883 and caloric values from 724 to 1,427 btu/cu ft. A total of 63 water samples obtained from seep locations and seep drainages were analyzed by atomic absorption spectrophotometry for ionic content and by solvent extraction for hydrocarbon content. Although some of the water at the oil seeps had a bitumen content as high as 246,000 mg/l, the amount of hydrocarbons actually reaching the Gulf of Alaska averaged <2 mg/l.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 8136
Source Name
NTIS: PB 259 325
Page last reviewed: November 26, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division