In-situ Stress Measurement of Qushan Island in Hangzhou Bay and Its Crustal Dynamic Significance
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摘要: 杭州湾衢山岛屿位于中国大陆华北、华南活动地块和华北华南地应力分区的边界地带，该区域的地应力研究工作对于理解该区域地壳应力状态和地壳动力学行为意义重大。研究区小衢山岛大地构造位于华南地槽褶皱系的浙东南褶皱带的东北部，距上海芦潮港30海里。基于小衢山岛上3个钻孔的水压致裂原地应力测试数据综合分析，研究区最大水平主应力方向范围为N56.9°W～ N76.9°W，说明该区域主要受太平洋板块和菲律宾海板块向北西西、北西向俯冲推挤力源的影响。最大、最小水平主应力量值基本随深度增加而增大，最大水平主应力量值一般为7.39～15.74 MPa，最小水平主应力量值一般为3.99～8.41 MPa，最大、最小侧压力系数范围分别为kH=2.11～7.56，kh=1.23～3.85。利用实测数据计算的剪应力积累因子μ的范围是0.36～0.77，平均值为0.55，剪应力积累程度较高。研究结果为认识中国大陆东部华北、华南活动地块的分界分区问题提供了新的地应力证据。Abstract: Qushan Island, located in Hangzhou Bay, lies at the boundary zone between the North China and South China active blocks, within the North China–South China in-situ stress zone. Investigating the in-situ stress state in this region is crucial for understanding the crustal stress distribution and tectonic dynamics. The Xiaoqushan Island tectonic structure, situated in the northeastern part of the South Zhejiang fold belt within the geosynclinal fold system of South China, is approximately 30 km from Luchao Port, Shanghai. Based on a comprehensive analysis of in-situ stress measurements from three boreholes on Xiaoqushan Island, the orientation of the maximum horizontal principal stress ranges from N56.9°W to N76.9°W, indicating that the region is primarily influenced by NWW- and NW-directed compressive forces associated with the subduction and push of the Pacific and Philippine Sea plates. Both the maximum and minimum horizontal principal stress values generally increase with depth. Maximum horizontal principal stress values range from 7.39 to 15.74 MPa, while minimum horizontal principal stress values range from 3.99 to 8.41 MPa. The corresponding maximum and minimum lateral pressure coefficients are 2.11–7.56 and 1.23–3.85, respectively. Analysis of the measured data indicates that the shear stress accumulation factor (μ) ranges from 0.36 to 0.77, with an average value of 0.55, suggesting a high degree of shear stress accumulation in the study area.
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Key words:
- Qushan Island /
- In-situ stress measurement /
- Tectonic stress field /
- Crustal dynamics
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图 1 XQS石油储备洞库址区域构造图
Figure 1. Regional geological structure map of XQS oil reserve cavern site
图 2 典型测试段水压致裂原地应力测量压力-时间图
Figure 2. Typical pressure-time diagram for in-situ stress measurement during hydraulic fracturing test section
图 5 3个钻孔的SH方向分布玫瑰图
Figure 5. Rose diagram of SH direction distribution of three boreholes
图 6 三个钻孔的侧压力系数随深度的拟合变化图
Figure 6. Fitting variation of lateral pressure coefficients with depth of three boreholes
表 1 3个钻孔水压致裂原地应力数据及特征值分析汇总表
Table 1. Summary of hydraulic fracturing in-situ stress data and characteristic value analysis for three drilling holes
钻孔编号 深度 SH Sh Sv kH kh μ R 最大主应力方向 /m /MPa /MPa /MPa ZKS-1 71.54 4.83 2.40 1.90 2.55 1.27 0.44 0.17 80.86 5.52 2.79 2.14 2.58 1.30 0.44 0.19 89.47 6.00 3.08 2.37 2.53 1.30 0.43 0.19 N61.9°W 93.42 8.54 4.42 2.48 3.45 1.78 0.55 0.32 ZKS-1 97.38 6.48 3.35 2.58 2.51 1.30 0.43 0.20 162.21 11.02 5.89 4.30 2.56 1.37 0.44 0.24 167.27 10.07 5.44 4.43 2.27 1.23 0.39 0.18 181.49 12.20 6.68 4.81 2.54 1.39 0.43 0.25 N63.3°W 192.96 14.82 7.99 5.11 2.90 1.56 0.49 0.30 N63.3°W 205.54 15.74 8.41 5.45 2.89 1.54 0.49 0.29 N58.9°W ZKS-2 60.87 10.60 5.50 1.61 6.57 3.41 0.74 0.43 62.84 10.32 5.42 1.67 6.19 3.25 0.72 0.43 66.1 13.25 6.75 1.75 7.56 3.85 0.77 0.43 71.24 9.80 5.20 1.89 5.19 2.75 0.68 0.42 N75.3°W 75.47 9.44 5.04 2.00 4.72 2.52 0.65 0.41 N76.9°W 76.34 10.55 5.85 2.02 5.21 2.89 0.68 0.45 80.93 7.39 3.99 2.14 3.45 1.86 0.55 0.35 85.94 9.64 4.84 2.28 4.23 2.13 0.62 0.35 N56.9°W 90.94 9.79 5.19 2.41 4.06 2.15 0.60 0.38 95.86 7.54 4.14 2.54 2.97 1.63 0.50 0.32 100.42 10.88 5.78 2.66 4.09 2.17 0.61 0.38 N69.6°W ZKS-3 65.70 3.67 2.14 1.74 2.11 1.23 0.36 0.21 N70.1°W 76.72 5.58 3.05 2.03 2.74 1.50 0.47 0.29 N66.3°W 90.07 10.81 5.78 2.39 4.53 2.42 0.64 0.40 98.16 10.79 5.76 2.60 4.15 2.22 0.61 0.39 101.74 10.92 5.90 2.70 4.05 2.19 0.60 0.39 117.76 10.28 5.65 3.12 3.29 1.81 0.53 0.35 N68.3°W 均值 3.77 2.00 0.55 0.32 N67.0°W 注：侧压力系数kH=SH/SV、kh=Sh/SV; 剪应力积累因子μ=（SH−SV）/（Sh−SV）; 应力型因子R=（SH−Sh） /（SH−SV）。 
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