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首页> 外文期刊>Geophysical Prospecting >Effective stresses and shear failure pressure from in situ Biot's coefficient, Hejre Field, North Sea
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Effective stresses and shear failure pressure from in situ Biot's coefficient, Hejre Field, North Sea

机译：来自北海海尔菲尔德原位比奥系数的有效应力和剪切破坏压力

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摘要

We propose a combination of Biot's equations for effective stress and the expression for shear failure in a rock to obtain an expression for minimum pore pressure in a stable vertical well bore. We show that a Biot's coefficient calculated from logging data in the Hejre Field, North Sea, is significantly different from 1. The log-derived Biot's coefficient is above 0.8 in the Shetland Chalk Group and in the Tyne Group, and 0.6-0.8 in the Heno Sandstone Formation. We show that the effective vertical and horizontal stresses obtained using the log-derived Biot's coefficient result in a drilling window for a vertical well larger than if approximating Biot's coefficient by 1. The estimation of the Biot's coefficient is straightforward in formations with a stiff frame, whereas in formations such as shales, caution has to be taken. We discuss the consequence of assumptions made on the mineral composition of shales as unphysical results could be obtained when choosing inappropriate mineral moduli.
机译：我们提出了有效应力的Biot方程和岩石剪切破坏的表达式的组合，以获得稳定的垂直井筒中最小孔隙压力的表达式。我们显示，根据北海赫赫尔油田的测井数据计算出的比奥系数与1显着不同。设得兰群岛和泰恩集团的对数推导比奥系数大于0.8，而设得兰群岛和泰恩集团则为0.6-0.8。河野砂岩组。我们表明，使用对数推导的毕奥特系数获得的有效垂直应力和水平应力会导致垂直井的钻窗大于将毕奥特系数近似为1的情况。在具有刚性框架的地层中，对毕奥特系数的估算很简单，而在诸如页岩之类的地层中，必须谨慎。我们讨论了对页岩矿物组成的假设的结果，因为当选择不合适的矿物模量时可以获得非物理结果。

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