摘要
低渗透储层是中国陆相沉积盆地重要的油气储层类型,而裂缝是低渗透砂岩储层油气的有效储集空间和主要渗流通道,影响着低渗透砂岩油气藏的开发方案部署和开发效果。建立应力应变与裂缝体积密度之间的定量关系是实现构造裂缝定量预测的关键。以史南油田史深100块沙三段中亚段储层砂岩样品为例,在物理测试和裂缝参数统计的基础上,根据岩石应变能和裂缝表面能守恒原理建立了理论力学模型,探讨了单轴压缩状态下储层应力与裂缝体积密度之间的定量关系。结果表明:裂缝体积密度和应变能密度呈线性关系,将储层应力值为0.85倍单轴压缩强度时的应变能密度作为产生裂缝所需克服的弹性应变能密度切实可行,只要进行少量的岩石单轴压缩实验就可获得应力应变和裂缝体积密度的定量关系。
Low permeability reservoir is an important reservoir type in Chinese continental sedimentary basin.As the effective storage space and main flowing channel for oil and gas,fracture affects definitely the development performance of low permeability sandstone reservoir.Building quantitative correlation between stress-strain and fracture volume density is the key to realize quantitative prediction of tectoclase.Quantitative correlation between stress-strain and fracture volume density of Mid-Sha III reservoir sandstone specimens in Shishen 100 fault block of Shinan oilfield is studied on uniaxial compression condition by physical test,fracture parameters statistics and establishing of theoretical mechanics model according to rock strain energy and fracture surface energy conservation principle.The results are presented as follows:fracture volume density is linearly dependent on strain energy density and it is feasible to take strain energy density as the elastic strain energy density that has to be overcome to produce fracture when stress value is 0.85 times of uniaxial compressive strength.Thereby,quantitative relation between stress-strain and fracture volume density can be obtained only by minor rock uniaxial compression experiments.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第4期87-90,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"低渗油气田高效开发钻井优化设计技术"(2008ZX05022-001)
关键词
应力应变
裂缝体积密度
构造裂缝
定量预测
低渗透储层
史南油田
stress-strain
fracture volume density
tectoclase
quantitative prediction
low permeability reservoir
Shinan oilfield
