Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (4): 993-1001.doi: 10.13278/j.cnki.jjuese.201504103

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Contributing Factor Divergence Analysis of Relative High Quality Reservoir of Upper Triassic in the 2nd and 4th Member of Xujiahe Formation of Xinchang Gas Field in West Sichuan

Liu Sibing, Shen Zhongmin, Lü Zhengxiang, Song Rongcai, Wang Peng   

  1. State Key Lab of Oil-Gas Reservoirs Geology and Exploitation/Chengdu University of Technology, Chengdu 610059, China
  • Received:2014-10-09 Published:2015-07-26

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Abstract:

Major relative high quality reservoirs are locally developed in the context of the entire super densified Xujiahe Formation in Xinchang in west Sichuan. They have a great burial depth, complicate diagenesis, and high density. The relative high quality reservoir is in the 2nd member of Xujiahe Formation with a big burial depth, which developed more primary pores than secondary pores; while the 4th member of Xujiahe Formation with small burial depth developed more secondary pores than primary pores. The main reason of this appearance is the divergent mechanisms of the primary pore conservation and secondary pore development of the 2nd and 4th member of Xujiahe Formation. The existence of the relatively developed encapsulating chlorite and the harsh particulates led to the well conservation of the primary pores in the 2nd member of Xujiahe Formation; while the single thick sand and the undeveloped mudstone layer cause the poor influx of organic acid fluid, so that the feldspar corrosion is limited. As for the 4th member of Xujiahe Formation, the plasticity of the rocks is relatively high; this, in turn, resulted in the disappearance of the primary pores under the diagenetic compaction, while the secondary pores are relatively popular with minor authigenic kaolinite sedimentated, multiple thin single sand and mudstone developed, and sufficient feldspar corroded by organic acid fluid.

Key words: tight sandstones, relatively high-quality reservoir, Xujiahe Formation, Xinchang gasfield

CLC Number: 

  • P618.13

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