Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 16-23.doi: 10.3969/j.issn.1673-8926.2016.02.003

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Characteristics and controlling factors of shale pore structure of Yanchang Formation in Ordos Basin

Xiong Jian1， Luo Danxu2， Liu Xiangjun 1，2， Liang Lixi2   

  1.  1. School of Geoscience and Technology ， Southwest Petroleum University ， Chengdu 610500 ， China ； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ， Chengdu 610500 ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

The pore structure characteristics and influence factors of Chang 7 member of shale of the Upper Triassic Yanchang Formation in Ordos Basin were analyzed by low-pressure N2 adsorption/desorption analysis. The result shows that the shale pore structure of Chang 7 member in Ordos Basin is complicated, and pores are mainly consist of parallel-plate pores with four sides open and ink bottle-shaped. The mineral compositions of the shale are mainly quartz and clays, the former content is between 17.1% and 72.33%, and the latter content is between 12.37% and 61.55%. The BJH pore volume of the shale is concentrated in the range of 0.696-6.575 mm3/g, and the BET specific surface area is between 0.380 m2/g and 3.030 m2/g. The contents of TOC, clays and quartz have significant effects on the pore volume and pore specific surface area, whereas the carbonate and feldspar have a little influence. The pore volume and pore specific surface area are positively correlated with the contents of TOC, clays and feldspar, and negatively correlated with the contents of quartz and carbonate. The TOC and clays have significant control on micropore and mesopore volumes, whereas the quartz has positive effect on macropore volumes.

Key words: source-reservoir-caprock assemblage , successive type of assemblage , discontinuous type of assemblage , accumulation characteristics , Yanchang Formation , Ordos Basin

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