A far-field stress model based on theory of elasticity and utilizing the Mohr-Coulomb criterion is commonly used in the petroleum industry as a reliable method for present-day stress profiling. We have analysed the present-day stress profile in the Lower Paleozoic shale succession of the Baltic Basin (northern Poland), based on data from a single borehole. Our analyses take into account the vertical transverse isotropy (VTI) of the mechanical properties. Initial modelling of the stress profile showed – despite general agreement concerning the length and location of the modelled and observed breakouts – systematic differences when the profile of these structures is analysed in detail. Analyses carried out for selected segments of the borehole have shown that the mere presence of breakouts affects the interpretation of the mechanical properties, and thus also the stress profile. We have analysed the size of the necessary correction for tectonic strain, to avoid this effect, as well as uncertainty resulting from the failure criteria adopted. The final model, corrected for stress disturbances by breakouts, reveals the stratification of stress regime, with the dominance of a normal faulting regime, and low values of differential stresses in the shale formations

基于弹性理论并利用 Mohr-Coulomb 准则的远场应力模型通常用于石油工业，作为当今应力分析的可靠方法。我们已经根据单个钻孔的数据分析了波罗的海盆地（波兰北部）下古生界页岩层序的当前应力剖面。我们的分析考虑了机械性能的垂直横向各向同性 (VTI)。应力剖面的初始建模显示——尽管在建模和观察到的突破的长度和位置方面普遍一致——在详细分析这些结构的剖面时存在系统差异。对选定的钻孔段进行的分析表明，仅存在突破就会影响机械性能的解释，因此也是应力分布。我们已经分析了构造应变的必要修正的大小，以避免这种影响，以及由于采用的破坏标准导致的不确定性。最终模型通过突破对应力扰动进行了校正，揭示了应力状态的分层，以正常断层状态为主导，页岩地层中的微分应力值较低