Xiaoyue Gao, Luofu Liu, Zhenxue Jiang, Xiaoqing Shang, Guodong Liu. A pre-Paleogene unconformity surface of the Sikeshu Sag, Junggar Basin: Lithological, geophysical and geochemical implications for the transportation of hydrocarbons[J]. Geoscience Frontiers, 2013, 4(6): 779-786. DOI: 10.1016/j.gsf.2012.12.003
Citation: Xiaoyue Gao, Luofu Liu, Zhenxue Jiang, Xiaoqing Shang, Guodong Liu. A pre-Paleogene unconformity surface of the Sikeshu Sag, Junggar Basin: Lithological, geophysical and geochemical implications for the transportation of hydrocarbons[J]. Geoscience Frontiers, 2013, 4(6): 779-786. DOI: 10.1016/j.gsf.2012.12.003

A pre-Paleogene unconformity surface of the Sikeshu Sag, Junggar Basin: Lithological, geophysical and geochemical implications for the transportation of hydrocarbons

  • The unconformity surface at the bottom of the Paleogene is one of the most important migration pathways in the Sikeshu Sag of the Junggar Basin, which consists of three layers: upper coarse clastic rock, lower weathering crust and leached zone. The upper coarse clastic rock is characterized by higher density and lower SDT and gamma-ray logging parameters, while the lower weathering crust displays opposite features. The transport coefficient of the unconformity surface is controlled by its position in respect to the basal sandstone; it is higher in the ramp region but lower in the adjacent uplifted and sag areas. The content of saturated hydrocarbons increases with the decrease of the content of non-hydrocarbons and asphaltenes. The content of benzoc carbazole decreases as the content of benzoa carbazole and alkyl carbazole/alkyl + benzo carbazole increases. This suggests that the unconformity surface is an efficient medium for the transportation of hydrocarbons.
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