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Stress Sensitivity of Seismic and Electric Rock Properties of the Upper Continental Crust at the KTB

机译：KTB上陆壳地壳的地震和电岩石特性的应力敏感性

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摘要

We test the hypothesis that the general trend of P-wave and S-wave sonic log velocities and resistivity with depth in the pilot hole of the KTB site Germany, can be explained by the progressive closure of the compliant porosity with increasingly effective pressure. We introduce a quantity θ c characterizing the stress sensitivity of the mentioned properties. An analysis of the downhole measurements showed that estimates of the quantitiy θ c for seismic velocities and electrical formation factor of the in situ formation coincide. Moreover, this quantity is 3.5 to 4.5 times larger than the averaged stress sensitivity obtained from core samples. We conclude that the hypothesis mentioned above is consistent with both data sets. Moreover, since θ c corresponds approximately to the inverse of the effective crack aspect ratio, larger in situ estimates of θ c might reflect the influence of fractures and faults on the stress sensitivity of the crystalline formation in contrast to the stress sensitivity of the nearly intact core samples. Finally, because the stress sensitivity is directly related to the elastic nonlinearity we conclude that the elastic nonlinearity (i.e., deviation from linear stress-strain relationship i.e., Hooke's law) of the KTB rocks is significantly larger in situ than in the laboratory.
机译：我们检验了这样的假设：在KTB站点德国的导向孔中，P波和S波声波测井速度和电阻率随深度的总体趋势可以用逐渐增加的有效压力顺应性孔隙逐渐封闭来解释。我们引入了一个θc 量，该量表征了上述特性的应力敏感性。对井下测量的分析表明，地震速度的定量θc 的估计与原位地层的电形成因子是一致的。而且，该量是从岩心样品获得的平均应力敏感性的3.5至4.5倍。我们得出结论，上述假设与两个数据集都一致。此外，由于θc 近似等于有效裂缝长宽比的倒数，因此较大的θc 原位估计值可能反映出裂缝和断层对晶体形成应力敏感性的影响。对几乎完整的岩心样品的应力敏感度。最后，由于应力敏感性与弹性非线性直接相关，因此我们得出结论，KTB岩石的弹性非线性（即偏离线性应力-应变关系，即胡克定律）在现场比实验室要大得多。

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