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王斌, 秦向辉, 陈群策, 孙东生. 鄂尔多斯地块西南缘宁夏固原地区原位地应力测量结果及其成因[J]. 地质通报, 2020, 39(7): 983-994.
引用本文: 王斌, 秦向辉, 陈群策, 孙东生. 鄂尔多斯地块西南缘宁夏固原地区原位地应力测量结果及其成因[J]. 地质通报, 2020, 39(7): 983-994.
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WANG Bin, QIN Xianghui, CHEN Qunce, SUN Dongsheng. Measurement results of in-situ stress in Guyuan area of Ningxia on the southwest margin of Ordos block and its causation analysis[J]. Geological Bulletin of China, 2020, 39(7): 983-994.
Citation: WANG Bin, QIN Xianghui, CHEN Qunce, SUN Dongsheng. Measurement results of in-situ stress in Guyuan area of Ningxia on the southwest margin of Ordos block and its causation analysis[J]. Geological Bulletin of China, 2020, 39(7): 983-994.
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鄂尔多斯地块西南缘宁夏固原地区原位地应力测量结果及其成因

  • 1.

    中国地质科学院地质力学研究所, 北京 100081

  • 2.

    新构造运动与地质灾害重点实验室, 北京 100081

  • 基金项目:
    国家科技重大专项项目《地下深部水压致裂地应力测试设备研发及应用》（编号：2016ZX05034）和中国地质调查局项目《重点地区构造体系及油气页岩气控藏条件调查》（编号：DD20190085）
详细信息
    作者简介: 王斌(1990-), 男, 在读博士生, 从事地应力测量技术及应用研究。E-mail:hpuwangbin@163.com
    通讯作者: 秦向辉(1984-), 男, 博士, 副研究员, 从事地应力测量、构造应力场等方面的研究。E-mail:qinxiangh03@126.com

  • 中图分类号: P553

Measurement results of in-situ stress in Guyuan area of Ningxia on the southwest margin of Ordos block and its causation analysis

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China

More Information

    摘要

  • 鄂尔多斯地块西南缘新构造活动强烈、地震频发，具有复杂多样的构造变形模式和活动特征。为了解鄂尔多斯地块西南缘地壳浅部地应力分布规律及断层稳定性，利用宁夏固原地区的水压致裂地应力测量数据，结合其他实测及震源机制解资料，分析了鄂尔多斯地块西南缘构造应力场特征。结果表明：①研究区2个钻孔的主应力关系整体表现为SH > Sv > Sh，水平应力起主导作用，属于走滑型应力状态，钻孔附近最大水平主应力方位平均为N59°W，与震源机制解获得的青藏高原东北缘主压应力方位有差异，推断鄂尔多斯地块西南缘现今NWW向走滑剪切应力环境的形成可能主要受到海原断裂带和六盘山断裂带的影响，应为局部构造和区域构造应力场共同作用的结果。②利用Mohr-Coulomb准则及Byerlee定律，摩擦系数取0.6~1.0，对研究区的现今地应力状态分析后发现，鄂尔多斯地块西南缘海原断裂带和六盘山断裂带的地应力大小未达到地壳浅部断层产生滑动失稳的临界条件，处于较稳定的应力状态。该研究成果为鄂尔多斯地块关键构造部位的断裂活动性分析和地质环境安全评价提供了参考依据。

    The southwestern margin of the Ordos block has experienced many great earthquakes with complicated tectonic deformation and tectonic activities.In order to understand in-situ stress environment of southwestern margin of the Ordos block and to evaluate the seismic risk, the authors carried out the in-situ stress measurement by hydraulic fracturing in two boreholes in the Guyuan area of Ningxia.Combined with other measured data and focal mechanism solutions, the authors discussed the tectonic stress field characteristics of the southwestern margin of the Ordos block.Some conclusions have been reached:(1) The results show that the relationship of principal stress of the two boreholes in the study area is SH > Sv > Sh, belonging to the strike-slip stress state.The azimuth of maximum horizontal principal stress near the borehole is N59°W; however, it is different from the P-axis orientation of focal mechanism solutions on the northeastern margin of the Tibetan Plateau.It is considered that the formation of the NWW strike-slip shear stress environment on the southwestern margin of the Ordos block is mainly affected by the Haiyuan fault and Liupanshan fault zone.The current stress environment may be the result of the combined effect of local structure and regional tectonic stress fields.(2) The crustal activity in the study area is discussed using the Mohr-Coulomb criterion and Byerlee's law under the premise that the friction coefficient is 0.6~1.0.The in-situ stress state of the southwestern margin of the Ordos block has not reached the sliding critical condition of the shallow fault and is in a relatively stable crustal stress state.The results have great significance for analysis of active faults as well as assessment of the regional geological environment and geological disasters prevention.

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  • 图 1  鄂尔多斯地块地形地貌、活动断裂、地震分布特征(a)和研究区地质构造简图[29](b)

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  水压致裂地应力测量时间-压力曲线

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  水压致裂定向印模形状及其方向

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  研究区主应力值随深度变化曲线(a)和最大水平主应力方向随深度分布特征图(b)

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    图 5  鄂尔多斯地块西南缘地壳运动速度场[56](a)及现今构造应力场图[57](b)

    Figure 5. 

    下载: 全尺寸图片 幻灯片

    图 6  基于地应力实测数据的库伦摩擦滑动计算结果

    Figure 6. 

    下载: 全尺寸图片 幻灯片

    表 1  鄂尔多斯西南缘水压致裂地应力测量结果

    Table 1.  Results of in-situ stress measurement on the southwest margin of Ordos block

    钻孔 深度/m 压裂参数/MPa 应力值/MPa 破裂方位
    Pb Pr Ps PH P0 Sh SH Sv
    ZK7 128.50 5.77 4.09 2.91 1.29 0.64 2.91 3.99 3.41
    157.50 10.44 4.70 3.36 1.58 0.93 3.36 4.44 4.17
    181.20 7.11 5.37 3.96 1.81 1.16 3.96 5.35 4.80 N62°W
    202.00 14.72 6.98 4.52 2.02 1.37 4.52 5.21 5.35 N56°W
    213.50 13.97 10.74 6.56 2.14 1.49 6.56 7.44 5.66
    231.50 17.70 9.53 6.25 2.32 1.67 6.25 7.54 6.13 N45°W
    250.80 15.08 8.57 6.11 2.51 1.86 6.11 7.90 6.65
    ZK10 206.00 6.77 4.63 4.29 2.06 1.09 4.29 7.15 5.46
    248.00 9.91 5.36 4.10 2.48 1.51 4.10 5.43 6.57 N75°W
    250.00 9.69 6.95 6.15 2.50 1.53 6.15 9.97 6.63
    258.10 9.90 5.28 5.00 2.58 1.61 5.00 8.11 6.84 N65°W
    269.50 11.94 5.67 5.25 2.70 1.72 5.25 8.35 7.14 N52°W
    282.40 7.90 6.69 5.26 2.82 1.85 5.26 7.25 7.48
     注：Pb为岩石原地破裂压力；Pr为破裂面重张压力；Ps为破裂面瞬时关闭压力；PH为静水压力；P0为孔隙压力；SH为最大水平主应力；Sh为最小水平主应力；Sv为根据上覆岩层重量计算的垂向主应力(岩石密度取2.65 g/cm3)
    下载: 导出CSV

    表 2  不同地区SH、Sh随深度变化情况

    Table 2.  Variation of SH and Sh with the depth in different regions

    地区 SH Sh 资料来源
    研究区 0.0295H+0.2395 0.0173H+1.066 本文
    华北地区 0.0233H+4.665 0.0162H+2.100 [50]
    南北地震带北段 0.0261H+5.134 0.0174H+2.648 [51]
    青藏地块 0.0292H+5.185 0.0172H+3.681 [51]
    中国大陆 0.0227H+6.590 0.0164H+3.590 [52]
    中国大陆 0.0216H+6.781 0.0182H+2.233 [53]
    中国大陆 0.0229H+4.738 0.0171H+1.829 [51]
    下载: 导出CSV
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收稿日期:  2019-08-23
修回日期:  2020-03-24
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