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首页> 外文期刊>Earth, planets and space: EPS >Comparison of stress state around the Atera fault, central Japan, estimated using boring core samples and by improved hydraulic fracture tests
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Comparison of stress state around the Atera fault, central Japan, estimated using boring core samples and by improved hydraulic fracture tests

机译：使用钻孔岩心样本和改进的水力压裂试验估算的日本中部Atera断层周围的应力状态比较

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An often disputed subject is whether the stress memory of rocks can be reproduced by deformation rate analysis (DRA). Doubt has also been expressed on whether a rock can memorize its stress history. We compared the stress state around the Atera fault system, central Japan, using the hydraulic fracture test (HFT) and DRA at the same boreholes. The quality of the HFT results at these holes, especially that of the magnitude of maximum horizontal compression (SHmax), was recently improved by considering the tensile strength of the borehole wall. The SHmax azimuth determined by the DRA was about N-S. Although this is inconsistent with the geological presumption, it agrees well with the SHmax azimuth estimated by the HFT and the drilling-induced tensile fracture (DITF). The magnitudes of horizontal principal stresses obtained by DRA were generally consistent with the improved HFT results, and the consistency between stress states estimated by the DRA and the HFT indicates the existence of stress memory. Based on our results, we conclude that the DRA can be one option for measuring the stress state of the earth's crust.
机译：一个经常引起争议的主题是，是否可以通过变形率分析（DRA）来再现岩石的应力记忆。人们还对岩石是否能记住其应力历史表示怀疑。我们在同一井眼使用水力压裂试验（HFT）和DRA比较了日本中部Atera断层系统周围的应力状态。最近，考虑到井壁的抗拉强度，提高了这些孔处的HFT结果质量，尤其是最大水平压缩（SHmax）值的质量。 DRA确定的SHmax方位角约为N-S。尽管这与地质推定不一致，但它与HFT估计的SHmax方位角和钻井诱发的拉伸断裂（DITF）很好地吻合。 DRA获得的水平主应力的大小通常与改进的HFT结果一致，并且DRA和HFT估计的应力状态之间的一致性表明存在应力记忆。根据我们的结果，我们得出结论，DRA可以作为测量地壳应力状态的一种选择。

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