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

作者：Gao, Xiaoyue; Liu, Luofu^*; Jiang, Zhenxue; Shang, Xiaoqing; Liu, Guodong

来源：Geoscience Frontiers, 2013, 4(6): 779-786.

DOI：10.1016/j.gsf.2012.12.003

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 benzo[c] carbazole decreases as the content of benzo[a] carbazole and [alkyl carbazole]/[alkyl + benzo carbazole] increases. This suggests that the unconformity surface is an efficient medium for the transportation of hydrocarbons.

• 出版日期2013-11
• 单位中国石油大学（北京）