Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 103-108.doi: 10.3969/j.issn.1673-8926.2014.04.015

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Quantitative research on the effect of diagenesis on porosity evolution of Xujiahe Formation in northeastern Sichuang Basin

HU Hao1， LU Yao2， TANG Qunying3，WANG Min1   

  1. 1. No. 7 Oil Production Plant， PetroChina Daqing Oilfield Company Ltd.， Daqing 163000， Heilongjiang， China； 2. College of Earth Sciences， Yangtze University， Wuhan 430010， China； 3. Research Institute of Exploration and Development， PetroChina Qinghai Oilfield Company， Dunhuang 736202， Gansu， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

Based on the data of rock slice, cast thin section, scanning electronic microscope, fractional and reservoir physical properties analysis, this paper summarized reservoir space and pore structure of Xujiahe Formation in northeast Sichuan Basin, analyzed the diagenesis types, and quantitatively calculated the pore evolution process. The research reveals that the reservoir of Xujiahe Formation is in the middle diagenetic B phase. The diagenesis includes compaction, cementation, dissolution and tectonic fracturing. The average original porosity is 31.1%. 45.74% pores are lost for compaction, and 22.51% pores are filled by cementation. However, the porosity was added to 6.4% because of dissolution and tectonic fracturing, which improved the reservoir quality in some degree. The result of calculated porosity is in accord with actual porosity, which shows the feasibility of this method, and it contributes directive meanings in the evaluation of diagenetic evolution.

Key words:  sedimentary system, sedimentary facies distribution, Xujiahe Formation, Santai-Yanting area, Sichuan Basin

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