摘要
根据裂缝形成的微观原理,选用库伦—莫尔准则及格里菲斯准则作为岩石剪性及张性破裂判断依据,以岩石力学和断裂力学中应变能及表面能理论为基础,借助于表征单元体及裂缝平板渗流模型分别研究了三向挤压应力状态及有张应力存在情况下地应力与构造裂缝参数之间的定量关系并给出计算模型。使用该模型能够计算裂缝密度、开度、孔隙度、渗透率等参数,在渗透率的计算中体现了矢量参数的方向性差异。地应力与构造裂缝参数计算模型适用于砂岩、碳酸盐岩、火成岩等多种脆弹性岩层,与地应力场数值模拟相结合能够有效地进行储层裂缝的定量表征及裂缝参数的定量预测。
On the bases of strain energy,surface energy in rock and fracturing mechanics theory,the relationship between crustal stress and parameters of tectonic fracture was confirmed using the represent element volume and flat seepage model.The Coulumb-Mohr principle was applied to the examination of shear fracture,while Griffith principle was taken as the examination of tension fracture.The calculation model of the relationship between crustal stress and tectonic fracture parameter was developed and used to calculate aperture,density,porosity and permeability of fractures on the basis of paleo-fracture parameters.The calculated vector parameters such as permeability were anisotropy using this model.In combination with stress field numerical simulation,the calculation model is available to quantitave characterization of reservoir fractures and prediction of fracture parameters in the brittle-elasticity strata,such as sandstone,carbonate and igneous rocks.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2010年第1期68-72,共5页
Acta Petrolei Sinica
基金
国家"十五"科技重点攻关项目(2003BA613A-02)部分成果
关键词
构造裂缝参数
地应力
孔隙度
渗透率
储层裂缝
定量表征
定量预测
tectonic ~racture parameter
crustal stress
porosity
permeability
reservoir fractures quantitative eharacterization
quantitative prediction
