中文摘要：

利用套管变形资料估算测点地应力和反演储层应力场。首先,根据API标准确定套管挤毁压力,并根据地应力和挤毁压力的关系确定测点的均匀地应力或平均地应力。通过对套管和地层系统进行弹性分析,给出柔度比、位移比和应力比的关系;由套管变形资料给出位移比,而柔度比是由系统本身决定的,由此确定应力比;再结合平均地应力,估算测点的非均匀地应力。其次,以得到的测点地应力作为基础资料,利用有限元和最小二乘法外推储层区域应力场。最后,利用大庆葡北储层二断块的套管变形资料研究该区域的三维应力场,为分析该区域套管损坏提供判断依据。该方法为缺乏实测地应力资料的区域提供反演储层应力场的新途径。

英文摘要：

　A new method is proposed which is used to approximately calculate the in-situ stresses with the logging data of casing deformation and to inverse the stress field of reservoir.Firstly,the uniform or average in-situ stresses may be determined on the bases of the damage pressure which can be determined by API.The relation among flexibility ratio,displacement ratio and stress ratio may be determined by analyzing of the elastic system with the casing and formation.The flexibility ratio depends on the elasticity and the geometry structure of the system.The displacement ratio is calculated by the logging data of the casing deformation.The stress ratio can be obtained by the flexibility ratio and the displacement ratio.Therefore,the nonuniform in-situ stresses can be obtained by the stress ratio and the average stresses.Secondly,taking the in-situ stresses as the foundational data,the finite element and inverse method are utilized to calculate the stress field of the reservoir.Finally,the method is applied to Daqing Oilfield preliminarily.The method makes it possible to inverse stress field in the formation where the data of in-situ stress measured are scarce.