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

Abstract

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 (J₁$s^{1}_{2}$). 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 words: Junggar basin, oil-source correlation, biomarker, carbon isotope

CLC Number:

TE112.114

LI Zhi-ming, QIN Jian-zhong, LIAO Zong-ting, LIU Wen-bin, FAN Ming, WANG Chuan-sheng. Analysis of Oil Source in Well Z-1 in Junggar Basin[J]. Xinjiang Petroleum Geology, 2006, 27(1): 38-41.

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