我国某地下油库预可行性研究地应力测量及其应用分析
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摘要
本文运用水压致裂地应力测量方法,对我国某地下油库预可行性研究工程场区两个钻孔进行了地应力测量。测量结果表明:最大和最小水平主应力(SH,Sh)都远大于对应深度处的垂向应力(Sv),三向主应力的关系为:SH>Sh>Sv,应力大小在该深度范围属中等偏大级别;工程场区最大水平主应力方向近EW方向,与测点外围确定的区域最大水平主应力总体方向较为一致;建议未来地下硐库长轴按近EW分布,地应力状态、岩体结构构造、岩石强度等基本保证了其岩体稳定性。
Hydrofracturing in situ stress measurements were used to determine in situ stress states of two drill holes for the pre-feasibility study of an underground reservoir at an engineering site in China.Both the maximum and minimum horizontal principal stresses(S_H and S_h)are by far greater than the vertical stress(S_v)at the same depth,and the SH and Sh are higher than the normal stress state at the depth range,with a relation of S_H>S_h>S_v.The maximum horizontal principal stress direction is nearly(E-W),which is in accord with the general direction of the regional maximum horizontal principal stress determined by measuring points in surrounding areas.The authors suggest that the long axis of the underground reservoir should be oriented in a nearly E-W direction in the future,and the in situ stress state,rock mass structure and rock strength will in the main ensure the rock mass stability.
Hydrofracturing in situ stress measurements were used to determine in situ stress states of two drill holes for the pre-feasibility study of an underground reservoir at an engineering site in China.Both the maximum and minimum horizontal principal stresses(S_H and S_h)are by far greater than the vertical stress(S_v)at the same depth,and the SH and Sh are higher than the normal stress state at the depth range,with a relation of S_H>S_h>S_v.The maximum horizontal principal stress direction is nearly(E-W),which is in accord with the general direction of the regional maximum horizontal principal stress determined by measuring points in surrounding areas.The authors suggest that the long axis of the underground reservoir should be oriented in a nearly E-W direction in the future,and the in situ stress state,rock mass structure and rock strength will in the main ensure the rock mass stability.
引文
[1]国际岩石力学学会试验方法委员会确定岩石应力建议方法,方法2:采用水压致裂技术确定岩石应力的建议方法[J].Int.J.Rock Mech.Min.Sci.&Geomech.Abstract.1987,24(1):53~73.
[2]白世伟,李光煜.二滩水电站岩体应力场研究[J].岩石力学与工程学报,1982,1(1):45~55.
[3]陈彭年,陈宏德,等.世界地应力实测资料汇编[M].北京:地震出版社,1990.
[4]李方全,张伯崇,等.三峡坝区水库诱发地震研究-茅坪钻孔的现场测试与分析[M].北京:地震出版社,1993.
[5]陈庆宣,王维襄,等.岩石力学与构造应力场分析[M].北京:地质出版社,1998.
[6]向文,李辉.重力场与构造应力场内在关系的理论研究[J].地壳形变与地震,1999,19(1):32~36.
[7]游永雄.重力转换区域构造应力场的研究[J].地球物理学报,1994,37(增刊Ⅱ):259~271.
[8]谭成轩,孙叶,等.构造应力面研究[J].岩石力学与工程学报,2004,23(23):3970-3978.
[9]谭成轩,孙叶,等.地应力测量值得注意的若干问题[J].地质力学学报,2003,9(3):275~280.
[10]谢富仁,崔效锋,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654~662.
[11]谢富仁,陈群策,等.中国大陆地壳应力环境基础数据库,中国大陆地壳应力环境研究[M].北京:地质出版社,2003.
[12]Martin CD.Characterizing in-situ stress domains at the AECL underground research laboratory[J].Canadian GeotechnicalJournal.1990,27:631~646.
[13]Zoback ML.First-and second-order patterns of stress in the lithosphere:The World Stress Map Project[J].Journal Geophys Res,1992,97(B8):11703~11728.
[14]McGarr A.On the state of lithospheric stress in the absence of applied tectonic forces[J].Journal Geophys Res,1988,93:13609~13617.
[15]Tan Chengxuan,Wang Ruijiang,Sun Ye,et al.Numerical modeling estimation of the‘tectonic stress plane(TSP)’beneathtopography with quasi-U-shaped valleys[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):303~310.
[2]白世伟,李光煜.二滩水电站岩体应力场研究[J].岩石力学与工程学报,1982,1(1):45~55.
[3]陈彭年,陈宏德,等.世界地应力实测资料汇编[M].北京:地震出版社,1990.
[4]李方全,张伯崇,等.三峡坝区水库诱发地震研究-茅坪钻孔的现场测试与分析[M].北京:地震出版社,1993.
[5]陈庆宣,王维襄,等.岩石力学与构造应力场分析[M].北京:地质出版社,1998.
[6]向文,李辉.重力场与构造应力场内在关系的理论研究[J].地壳形变与地震,1999,19(1):32~36.
[7]游永雄.重力转换区域构造应力场的研究[J].地球物理学报,1994,37(增刊Ⅱ):259~271.
[8]谭成轩,孙叶,等.构造应力面研究[J].岩石力学与工程学报,2004,23(23):3970-3978.
[9]谭成轩,孙叶,等.地应力测量值得注意的若干问题[J].地质力学学报,2003,9(3):275~280.
[10]谢富仁,崔效锋,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654~662.
[11]谢富仁,陈群策,等.中国大陆地壳应力环境基础数据库,中国大陆地壳应力环境研究[M].北京:地质出版社,2003.
[12]Martin CD.Characterizing in-situ stress domains at the AECL underground research laboratory[J].Canadian GeotechnicalJournal.1990,27:631~646.
[13]Zoback ML.First-and second-order patterns of stress in the lithosphere:The World Stress Map Project[J].Journal Geophys Res,1992,97(B8):11703~11728.
[14]McGarr A.On the state of lithospheric stress in the absence of applied tectonic forces[J].Journal Geophys Res,1988,93:13609~13617.
[15]Tan Chengxuan,Wang Ruijiang,Sun Ye,et al.Numerical modeling estimation of the‘tectonic stress plane(TSP)’beneathtopography with quasi-U-shaped valleys[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):303~310.
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