| 上海地区浅部地应力测量及其构造地质意义分析 |
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| 引用本文： | 张浩,施刚,巫虹,邵磊,王乾.上海地区浅部地应力测量及其构造地质意义分析[J].地质力学学报,2020,26(4):583-594. |
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| 作者姓名： | 张浩 施刚 巫虹 邵磊 王乾 |
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| 作者单位： | 1.同济大学海洋地质国家重点实验室, 上海 200092 |
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| 基金项目： | 上海市财政资金项目（002021080001） |
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| 摘 要： | 通过水压致裂法与超声波成像测井法相结合的方法，对上海地区浅部（180 m深度范围）原位地应力进行了测量。测量结果表明:最大水平主应力值在9.54~12.91 MPa之间，最小水平主应力值在5.41~6.96 MPa之间，最大水平主应力方向为北西42°-62°，优势方位为北西，地应力结构为SH > Sh > Sv，可以反映区域构造应力场特征。依据区域内断裂空间分布特征和现今实测地应力结果综合分析认为，北东向断裂易于发生压性或压扭性逆断活动，断裂相对稳定；而北西向断裂易于发生张性或张扭性正断活动，在现今相对较高的应力水平状态下仍值得关注。测量结果可能对于揭示区域构造界线（江山-绍兴断裂）的走向有一定启示。
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| 关 键 词： | 原位地应力 水压致裂法 超声波成像测井法 断裂活动性 区域构造动力背景 |
| 收稿时间： | 2020/3/7 0:00:00 |
| 修稿时间： | 2020/5/12 0:00:00 |
In-situ stress measurement in the shallow basement of the Shanghai area and its structural geological significance |
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| ZHANG Hao,SHI Gang,WU Hong,SHAO Lei,WANG Qian.In-situ stress measurement in the shallow basement of the Shanghai area and its structural geological significance[J].Journal of Geomechanics,2020,26(4):583-594. |
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| Authors: | ZHANG Hao SHI Gang WU Hong SHAO Lei WANG Qian |
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| Institution: | 1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China2.Shanghai Institute of Geological Engineering Exploration, Shanghai 200072, China |
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| Abstract: | By the hydraulic fracturing method and the ultrasonic imaging logging method, in-situ stress measurement was carried out in the shallow basement (180 m depth range) of the Shanghai area. The measurement results show that the maximum horizontal principal stress is between 9.54~12.91 MPa, and the minimum principal stress is between 5.41~6.96 MPa. The maximum horizontal principal stress direction is NW42°-62°, the dominant orientation is NW, and the stress structure is SH > Sh > Sv, which reflects the characteristics of the regional structural stress field. Based on the spatial distribution of the internal fractures in the area and the in-situ stress measurement results, the NE faults are prone to compressive or compression-torsional reverse faulting and the faults are relatively stable, while the NW faults are prone to tensile or tension-torsional positive faulting, which is still worthy of attention under the current relatively high stress level. At the same time, the in-situ stress measurement results may have guiding significance for the study of the structural boundary trend (the Jiangshan-Shaoxing fault) in this area. |
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| Keywords: | in-situ stress hydraulic fracturing ultrasonic imaging logging fault activity regional tectonic dynamic background |
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