Study on Stress Sensitivity in Ultra-Low Permeability Sandstone Reservoir of Chang 8 Oil Formation in Xifeng Oilfield Based on Microscopic Methods
详细信息
- 责任者：Liao Jijia (College of Geosciences ; China University of Petroleum ; Beijing 102249 ; China) ; Tang Hongming
- 刊名：Journal of China University of Petroleum
- 出版年：2012
- 卷期：36(2)
- 关键词：低渗透油气藏 ; low permeability reservoir ; 砂岩储集层 ; sandstone reservoirs
- 页码：p.27-33
- 图表：2 illus., 21 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Based on thin sections of casting,physical property analysis and mercury penetration analysis,the Chang 8 oil formation in Xifeng oilfield belongs to the ultra-low permeability sandstone reservoir.The stress sensitivity of porosity and fractured rock samples was studied.The fracture closure laws were evaluated and fracture width change was characterized quantitatively by specially designed fracture visualization test system and capillary flow porometer.The results show that in the research area,the stress sensitivity of porosity rock samples is weak and that of the fractured ones is strong.The chlorite in pore’s liner,the quartz secondary distributed partly and the high automorphic quartz crystallite are main causes of the low stress sensitivity injury rate and the high permeability recovery for porosity rock.
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