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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 reservoirs are important types of oil and gas reservoirs in continental terrestrial sedimentary basins, while fractures are the effective reservoir space and main seepage channel for low-permeability sandstone reservoirs, affecting the deployment and development of low-permeability sandstone reservoirs . Establishing the quantitative relationship between stress and strain and the bulk density of fractures is the key to the quantitative prediction of structural fractures. Taking the reservoir sandstone samples of the third member of Es3 in the Shushen oilfield as an example, based on the physical testing and the statistics of fracture parameters, the theoretical mechanics model is established according to the theory of rock strain energy and surface energy conservation. Quantitative relationship between reservoir stress and fracture bulk density under uniaxial compression. The results show that there is a linear relationship between the bulk density and the strain energy density, and it is feasible to use the strain energy density when the reservoir stress is 0.85 times uniaxial compressive strength as the elastic strain energy density needed to overcome the fracture. As long as a small amount of rock Uniaxial compression experiments can be obtained quantitative relationship between stress and strain and crack bulk density.