Quantitative research on the effect of diagenesis on porosity evolution of Xujiahe Formation in northeastern Sichuang Basin
Online published: 2014-08-15
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.
LI Yanan , ZHENG Rongcai , LI Guohui , WANG Xiaojuan , LI Nan , WANG Changyong . Quantitative research on the effect of diagenesis on porosity evolution of Xujiahe Formation in northeastern Sichuang Basin[J]. Lithologic Reservoirs, 2014 , 26(4) : 103 -108 . DOI: 10.3969/j.issn.1673-8926.2014.04.015
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