尕斯库勒渐新统下部油藏原油成因地球化学

doi:10.11743/ogg20040613

Abstract

Abstract:

Organic geochemical analysis shows that oils in the lower Oligocene reservoirs in Gas Hure,western Qaidam basin,are of typical salt lake origin and have the characteristics of both low mature oil and mature oil. Source correlation shows that oils in the lower Oligocene reservoirs in Gas Hure were mainly sourced from the lower Tertiary near mature or mature source rocks buried over 3500m in the adjacent area, which were deposited in salt lakes with high concentration of calcium and salt in strong reducing environment. Salt and high carbonate content in the source rocks significantly inhibited isomerization of steroid and terpenoid, wich would delay the maturation of lower Tertiary source rocks. Oils currently discovered in the lower Oligocene reservoirs in Gas Hure are mainly low mature oil, with rare immature and mature oils. Analysis shows that mature source rocks are mainly distributed in deep layers with a burial depth of over 4000m, thus deep layers would be the potential targets for discovering mature oils.

Key words: salt lake facies, low mature oil, hydrocarbon origin, biomarker, geochemistry, Gas Hure

CLC Number:

TE112.111

Li Sumei, Liu Luofu, Wang Tieguan. Geochemical origin of oil in Lower Oligocene reservoirs in Gas Hure,western Qaidam basin[J]. Oil & Gas Geology, 2004, 25(6): 666-670,691.

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Geochemical origin of oil in Lower Oligocene reservoirs in Gas Hure,western Qaidam basin

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