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Analysis of Oil Source in Well Z-1 in Junggar Basin

Wang Chuansheng

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Abstract

Well Z-1 is located at joint among Changji sag,Maqiao swell and Zhongguai swell that are regarded as Grade-2 structural units in Junggar basin,in which two oil-bearing zones are found at 4 788-4 797 m(K1tg) and 4 808.5-4 812.5 m(J1s21).The GC-MS analyses indicate that both of them have generally consistent geochemical properties in crude family component,carbon isotope and biomarkers,and the same oil source from reducing,salt-bearing and algae-enriched lake facies sediments with high maturity.Oil-source correlation shows that the crude oils in two zones mainly originate in the source rocks of Permian,mixed with certain crude oils from Jurassic or Jurassic-Triassic source rocks.Such a result is consistent with the geological background of existing multi-set source rocks in the studied area.

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What this paper is about

Well Z-1 is located at joint among Changji sag,Maqiao swell and Zhongguai swell that are regarded as Grade-2 structural units in Junggar basin,in which two oil-bearing zones are found at 4 788-4 797 m(K1tg) and 4 808.5-4 812.5 m(J1s21).The GC-MS analyses indicate that both of them have generally consistent geochemical properties in crude family component,carbon isotope and biomarkers,and the same oil source from reducing,salt-bearing and algae-enriched lake facies sediments with high maturity.Oil-source correlation shows that the crude oils in two zones mainly originate in the source rocks of Permian,mixed with certain crude oils from Jurassic or Jurassic-Triassic source rocks.Such a result is consistent with the geological background of existing multi-set source rocks in the studied area.

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Available abstract

Well Z-1 is located at joint among Changji sag,Maqiao swell and Zhongguai swell that are regarded as Grade-2 structural units in Junggar basin,in which two oil-bearing zones are found at 4 788-4 797 m(K1tg) and 4 808.5-4 812.5 m(J1s21).The GC-MS analyses indicate that both of them have generally consistent geochemical properties in crude family component,carbon isotope and biomarkers,and the same oil source from reducing,salt-bearing and algae-enriched lake facies sediments with high maturity.Oil-source correlation shows that the crude oils in two zones mainly originate in the source rocks of Permian,mixed with certain crude oils from Jurassic or Jurassic-Triassic source rocks.Such a result is consistent with the geological background of existing multi-set source rocks in the studied area.

Key concepts: Source rock, Geology, Facies, Structural basin, Maturity (psychological), Geochemistry, Permian, Swell

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