--> ABSTRACT: Oil-Source Rock Correlation Using Carbon Isotope Data and Biological Marker Compounds, Cook Inlet-Alaska Peninsula, Alaska, by L. B. Magoon, D. E. Anders; #91003 (1990).
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ABSTRACT: Previous HitOilNext Hit-Previous HitSourceNext Hit Previous HitRockNext Hit Previous HitCorrelationNext Hit Using Carbon Isotope Data and Biological Marker Compounds, Cook Inlet-Alaska Peninsula, Alaska

L. B. Magoon, D. E. Anders

Previous HitRockNext Hit and Previous HitoilNext Hit samples from the Cook Inlet-Alaska Peninsula area were analyzed to determine the source of the commercial hydrocarbons produced in the Cook Inlet basin from lower Tertiary nonmarine sandstone reservoirs. Previous HitRockNext Hit-Eval (hydrogen index) analysis and organic-carbon content were used to identify the most favorable Previous HitrockNext Hit samples for solvent extraction and carbon isotope, gas-chromatographic (GC), and gas-chromatrographic/mass-spectrometric (GCMS) analyses. On the basis of organic-matter richness, five nonmarine Tertiary coal and shale samples and 12 marine Mesozoic (Upper Triassic and Middle Jurassic) shale samples were selected. A total of 28 Previous HitoilNext Hit and condensate samples from producing wells, drill-stem tests, field separators, and seeps were used for Previous HitoilNext Hit-Previous HitoilNext Hit and Previous HitoilNext Hit-so rce Previous HitrockNext Hit Previous HitcorrelationNext Hit. On the basis of biomarker and carbon isotope data, four of the shallower oils and condensates are from nonmarine source rocks, and 24 of the deeper oils are sourced from marine shales. Geochemical and regional geologic considerations indicate the following conclusions. The upper Tertiary nonmarine oils and condensates associated with commercial microbial gas accumulations are geochemically similar to the immature organic matter in the Tertiary nonmarine rocks. In the upper Cook Inlet, marine oils in lower Tertiary nonmarine reservoirs originated from Middle Jurassic rocks that matured during the Pliocene to Holocene; in the lower Cook Inlet-Alaska Peninsula area, oils migrated from both Upper Triassic and Middle Jurassic source rocks during the Late Cretaceous to ea ly Tertiary. Although three petroleum systems are identified, this study on the petroleum potential in a convergent-margin setting indicates that only one of these three systems was responsible for the 1.2 billion bbl of recoverable Previous HitoilTop in the lower Tertiary nonmarine reservoirs.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990