The Theoretical Model between Fracture Parameters and Stress Field of Low-Permeability Sandstones
详细信息
- 责任者：Feng Jianwei (College of Geo-Resources & Information ; China University of Petroleum ; Qingdao 266555 ; China) ; Dai Junsheng
- 刊名：Acta Petrolei Sinica
- 出版年：2011
- 卷期：32(4)
- 关键词：低渗透储集层 ; low permeability reservoirs ; 砂岩储集层 ; sandstone reservoirs
- 页码：p.664-671
- 图表：6 illus., 4 tables, 16 refs.
- 分类号：1003
- 出版序号：999
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
Aiming at low-permeability sandstones, on the premise of reasonable preference of fracture criteria and based on the principle of geological mechanics, the authors established a mechanical model of the stress-strain field and parameters of fractures (aperture and density) by means of tests and theoretical derivation, and developed a set of quantitative methods using the relationship between fracture parameters and stress field. The results showed that the combination of an energy method with fracture criteria was an effective approach to establish the mechanical model of stress field and fracture parameters, when the inner stress state reached or exceeded failure conditions, the aperture and density of fractures would increase with the increase of strain energy density.