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首页> 外文期刊>International Journal of Earth Sciences >Present‑day tectonic stress from borehole breakouts in the North‑Sudetic Basin (northern Bohemian Massif, SW Poland) and its regional context
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Present‑day tectonic stress from borehole breakouts in the North‑Sudetic Basin (northern Bohemian Massif, SW Poland) and its regional context

机译：北婴儿盆地钻孔突破（北波希米亚Massif，SW波兰）及其区域背景下的现今构造压力

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摘要

We analyze borehole breakouts in 18 boreholes in the North-Sudetic Basin (NSB), located on the Lower Silesian tectonic block, to provide the first present-day stress analyses performed for the NSB. Dipmeter logs from the Upper Permian sedimentary succession showed short breakout profiles in 15 boreholes, from 458 to 1368 m depth interval. Integration of log and core interpretation revealed a close correlation between breakout occurrence and fault zones. The breakouts, although scarce, indicate consistent changes of maximum horizontal stress (S-Hmax) direction among three spatial clusters of boreholes: a prominent cluster of NNW-SSE S-Hmax direction and two subordinate ones of NW-SE and NE-SW S-Hmax directions. These stress patterns in the NSB may be placed in the tectonic stress context of the broader Sudetic region comprising the northern part of the Bohemian Massif and the Fore-Sudetic Homocline. For this area, statistics of compiled stress indicators exhibit a tri-modal S-Hmax direction distribution, quite similar to that obtained for the NSB. We proposed that stress directions and regime changes were triggered by minor fault reactivation in a transtensional stress regime, and this might be applicable also to the NSB.
机译：我们分析位于较低的Silesian构造块的北婴儿盆地（NSB）中的18个钻孔中的钻孔突破，以提供对NSB进行的第一个当前的应力分析。 Upper Permian沉积连续的尾数日志显示了15个钻孔的短突破轮廓，从458到1368米深度间隔。日志和核心解释的集成揭示了突破事件和故障区域之间的紧密相关性。突破虽然稀缺，但是在钻孔三个空间簇之间的最大水平应力（S-Hmax）方向的一致变化：NNW-SSE SSE S-HMAX方向的突出簇和NW-SE和NE-SW S的两个从属-hmax方向。 NSB中的这些应力模式可以被放置在更广泛促进区域的构造应力背景中，该赋予波希米亚MassIF的北部和前婴儿同源的北部。对于该区域，编译应力指示器的统计数据表现出三模态S-HMAX方向分布，与NSB获得的相似。我们提出通过在静音压力制度中的轻微故障再激活触发应力方向和制度变化，这也可能适用于NSB。

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