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地质力学学报:2020,26(4):583-594
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上海地区浅部地应力测量及其构造地质意义分析
(1.同济大学海洋地质国家重点实验室, 上海 200092;2.上海市地矿工程勘察院, 上海 200072)
In-situ stress measurement in the shallow basement of the Shanghai area and its structural geological significance
(1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2.Shanghai Institute of Geological Engineering Exploration, Shanghai 200072, China)
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投稿时间:2020-03-07    修订日期:2020-05-12
中文摘要: 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。
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.
文章编号:     中图分类号:P553    文献标志码:
基金项目:上海市财政资金项目(002021080001)
引用文本:
张浩,施刚,巫虹,等,2020.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,26(4):583-594.DOI:10.12090/j.issn.1006-6616.2020.26.04.051
ZHANG Hao,SHI Gang,WU Hong,et al,2020.In-situ stress measurement in the shallow basement of the Shanghai area and its structural geological significance[J].Journal of Geomechanics,26(4):583-594.DOI:10.12090/j.issn.1006-6616.2020.26.04.051

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