Xinjiang Petroleum Geology ›› 2007, Vol. 28 ›› Issue (4): 428-431.

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Diagenesis and Porosity Evolution of Jurassic Reservoir in Wu-Xia Area, Junggar Basin

XUE Xin-ke, HUANG Zhi-jiu, LI Zhen-hua, GUO Jian-gang   

  1. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
  • Received:2007-01-11 Online:2007-08-01 Published:2020-07-31

Abstract: The Jurassi reservoir in Wu-Xia area is dominated by lithic sandstone and feldspathic litharenite under alluvial fan, fan delta and braided river sedimentary environments. The diagenesis study shows that the porosity evolution of reservoir is closely related with the diagenesis types. Compaction and early cementation are the main reasons for destroying primary pores. The dissolution of detrital grain, clay mineral and calcite is the main factor for forming secondary pores. And the cement like ferrocalcite is responsible for the destruction of the secondary pores. The porosity evolution experienced three steps, including the destroying of primary pores, formation of secondary pores and destruction of secondary pores.

Key words: Wuerhe-Xizijie area, Jurassic, diagenesis, porosity evolution

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