Petroleum geology of Cook Inlet basin - an exploration model.

Magoon, L. B.; Claypool, G. E.

Abstract:

Oil exploration at Cook Inlet on the Iniskin Peninsula reveals sandstone of potential reservoir quality in Cretaceous and lower Tertiary rocks. All siltstones and shales analyzed are low in oil-prone organic matter, and only coals are high in humic organic matter. Oil analyses suggest that oils from the major fields of the Cook Inlet region have a common source. In addition, the Middle Jurassic strata of the Iniskin Peninsula yield shows of oil and of gas in wells and in surface seeps. Hydrocarbons from this strata are similar to the Cook Inlet oils. Organic matter in Cretaceous and Tertiary rocks is thermally immature in all wells analysed. Oil reservoirs are of Tertiary age and unconformably overlie Jurassic rocks; the pre-Tertiary unconformity may be significant in exploration for new oil reserves. The unconformable relation between reservoir rocks and Middle Jurassic source rocks implies a delay in the expulsion of oil from Jurassic until late Tertiary when localized basin subsidence and thick sedimentary fill brought older, deeper rocks to the temperature required for petroleum generation. Evidence is used to reconstruct an oil migration route. -from Authors

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Article

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70012091

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Magoon, L. B.; Claypool, G. E.

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1061

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English

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American Association of Petroleum Geologists Bulletin

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19 p.

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AAPG

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Petroleum geology of Cook Inlet basin - an exploration model.; 1981; Article; Journal; American Association of Petroleum Geologists Bulletin; Magoon, L. B.; Claypool, G. E.

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1043

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Citation Year:

1981

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citation/reference

Text:

Petroleum geology of Cook Inlet basin - an exploration model.; 1981; Article; Journal; American Association of Petroleum Geologists Bulletin; Magoon, L. B.; Claypool, G. E.