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| 基于摩擦效应的砂岩裂缝密度定量预测 |
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宋璠1,苏妮娜1,冯建伟1,罗彩明2,陈静静3,宋明福3
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(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.中石油塔里木油田勘探开发研究院, 新疆库尔勒 841000;3.胜利油田鲁明油气勘探开发有限公司,山东东营 257001)
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| 摘要: |
| 以挤压型盆地内低渗砂岩储层为研究目标,研究应力场与裂缝参数的关系,通过岩石力学实验与理论推导相结合的方法,建立一套基于考虑裂缝面摩擦耗能的裂缝密度定量预测方法。研究表明:岩石变形准则与能量转换法相结合是建立应力场和裂缝参数力学模型的有效途径,当岩石内部应力状态超过破裂条件后,裂缝密度随应变能密度的增加而增大;裂缝的形成除了要克服岩石内在的黏聚力外,还要克服围压与摩擦效应形成的阻力,可使用库仑-莫尔破裂准则进行岩石破裂判别,进而明确应力-应变与岩石产生裂缝密度的数学关系。所建立的模型应用于准西北缘低渗砂岩裂缝密度预测取得了良好的效果。 |
| 关键词: 低渗透砂岩 应力-应变 摩擦耗能 裂缝密度 定量预测 |
| DOI：10.3969/j.issn.1673-5005.2014.06.001 |
| 分类号::TE 121.2 |
| 基金项目:教育部博士点基金项目(20120133120013);国家科技重大专项(2011ZX05009);中央高校基本科研业务费专项(27R1201009A) |
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| Quantitative prediction of fracture density based on friction effect |
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SONG Fan1, SU Nina1, FENG Jianwei1, LUO Caiming2, CHEN Jingjing3, SONG Mingfu3
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Exploration and Development Research Institute, Petrochina Tarim Oilfield Branch, Korla 841000, China;3.Luming Exploratory Development Limited of Shengli Oilfield, Dongying 257001, China)
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| Abstract: |
| Aiming at low-permeability reservoirs in compressional basins, a new fracture density quantitative prediction method considering surface friction energy was developed using rock mechanic tests and theoretical derivation of relationships between the stress field and fracture parameters. The results show that the combination of rock deformation criteria with the energy conversion laws is an effective approach to establish the mechanical model of the stress field and fracture parameters. The fracture density increases with strain energy density, after the inner stress state exceeds failure conditions. In addition to breaking the inner cohesion in the sandstone, the formation of cracks has to overcome the resistance of the confining pressure and the frictional effect. The Coulomb-Moire criterion can be used to estimate rock rupture, and then to clarify the mathematic relation between the stress-strain and rock fracture density. The predictions of the established model are in good agreement with the observed fracture density of low permeability sandstone in the northwest margin of Junggar Basin. |
| Key words: low permeability sandstone stress-strain friction energy fracture density quantitative prediction |
