Abstract A recently drilled exploratory well encompassing over 5 km of Mesozoic and Paleozoic sediments has been studied from the Bhiret Hammou field of the Berkine Basin, Algeria. Geophysical logs and downhole measurements have been integrated to ascertain rock strength, elastic properties, pore pressure and principal in-situ stress magnitudes. Vertical stress has an average 1.02 PSI/feet gradient in the studied field, as estimated from the density log. The Devonian shales are mildly over-pressured, while the Triassic and Carboniferous hydrocarbon reservoirs are in a hydrostatic pore pressure regime. Minimum and maximum horizontal stresses are quantified from a poroelastic strain model. The Sh gradient varies between 0.59 and 0.80 PSI/feet, whereas the SH gradient is interpreted as 0.86–1.26 PSI/feet. Based on the relative stress magnitudes (SH≥Sv>Sh), a present-day normal to strike-slip transitional tectonic regime is inferred.

中文翻译：

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阿尔及利亚 Berkine 盆地 Bhiret Hammou 油气田的孔隙压力和地应力大小

摘要 对阿尔及利亚 Berkine 盆地 Bhiret Hammou 油田最近钻探的探井进行了研究，该探井包含超过 5 公里的中生界和古生界沉积物。地球物理测井和井下测量已被整合，以确定岩石强度、弹性特性、孔隙压力和主要地应力大小。根据密度测井估计，垂直应力在研究领域的平均梯度为 1.02 PSI/英尺。泥盆系页岩轻度超压，而三叠系和石炭系油气藏处于静水孔隙压力状态。最小和最大水平应力从多孔弹性应变模型中量化。Sh 梯度在 0.59 和 0.80 PSI/英尺之间变化，而 SH 梯度被解释为 0.86-1.26 PSI/英尺。