深部盐岩含夹层地层初始地应力场模拟分析
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摘要
为了对深部盐岩储气库建腔进行可行性分析,结合金坛盐岩矿区地层情况,采用三维快速拉格朗日方法对盐岩地层沉积过程的自重应力分布进行了模拟计算,分析含夹层盐岩地层沉积过程自重地应力场的时空演化规律,得到了含夹层深部地层自重地应力垂直应力和侧压力系数的确定方法。结果表明,静力情况下,初始垂直地应力vσ、水平地应力hσ与埋深呈良好的线性关系,侧压力系数与半无限空间弹性理论值大体一致;蠕变作用下,岩层水平地应力不断增大直至与垂直地应力相等,最终使得岩层433.2 m以下处于静水压力状态,侧压系数变为1。总结金坛盐岩层初始地应力场分布规律可知,岩层分层面和夹层赋存的位置水平地应力会产生大幅突变,在储气库建腔设计及施工中应予以高度的重视。
To study the feasibility of building gas storage cavern in deep rock salt and based on the actual stratum situation of salt rock mining field in Jintan,the sedimentation progress of salt rock stratum under the action of gravity was simulated by the three-dimensional finite-volume method,and then the time-space evolvement rule of gravity induced in-situ ground stress was analyzed. The calculation method of vertical pressure component of in-situ ground stress and the coefficient of horizontal pressure were proposed.It was shown that σv and σhlinearly increased with the depth in static situation,and the coefficients of horizontal pressure quite matched the elastic theoretical solution in halt infinite space,that the horizontal pressure component gradually increased until equal to the vertical component under the action of creep,and the rock stratum under 443.2 m was under hydrostatic pressure,accordingly,the coefficient of horizontal pressure became 1.In conclusion,serious attention should be paid to the construction of gas storage cavern,for there are horizontal groumd stress multations on the interface of rock stratum as well as in the mudstone inter-layers.
To study the feasibility of building gas storage cavern in deep rock salt and based on the actual stratum situation of salt rock mining field in Jintan,the sedimentation progress of salt rock stratum under the action of gravity was simulated by the three-dimensional finite-volume method,and then the time-space evolvement rule of gravity induced in-situ ground stress was analyzed. The calculation method of vertical pressure component of in-situ ground stress and the coefficient of horizontal pressure were proposed.It was shown that σv and σhlinearly increased with the depth in static situation,and the coefficients of horizontal pressure quite matched the elastic theoretical solution in halt infinite space,that the horizontal pressure component gradually increased until equal to the vertical component under the action of creep,and the rock stratum under 443.2 m was under hydrostatic pressure,accordingly,the coefficient of horizontal pressure became 1.In conclusion,serious attention should be paid to the construction of gas storage cavern,for there are horizontal groumd stress multations on the interface of rock stratum as well as in the mudstone inter-layers.
引文
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[3]尹雪英,杨春和,李银平.泥岩夹层对层状盐岩体中储库稳定性影响[J].岩土力学,2006,27(增刊):344-348.YIN Xue-ying,YANG Chun-he,LI Yin-ping.Influ-ence mudstone interlayers on stability of oil storage inlaminates salt rock[J].Rock Mechanics,2006,27(supplement):344-348.(in Chinese).
[4]孙礼健,朱元清.初始地应力场方法研究[J].地震地磁观测与研究,2008,29(3):14-21.SUN Li-jian,ZHU Yuan-qing.The research progresson numerical analysis method of initial geostress[J].Seismological and Geomagnetic Observation and Re-search,2008,29(3):14-21.(in Chinese).
[5]李银平,尹雪英,高敬.中盐金坛压气蓄能电站工程初步可行性研究项目(地质)报告[R].武汉:中国科学院武汉岩土力学研究所,2007.
[6]李二兵.层状盐岩中天然气地下储存库稳定性评价研究[D].南京:解放军理工大学,2007.
[7]陈锋,杨春和,白世伟.盐岩储气库最佳采气速率数值模拟研究[J].岩土力学,2007,28(1):57-62.CHEN Feng,YANG Chun-he,BAI Shi-wei.Investi-gation on optimized gas recovery velocity of naturalgas storage in salt layer by numerical simulation[J].Rock Mechanics,2007,28(1):57-62.(in Chinese).
[8]蔡美锋.岩石力学与工程[M].北京:科学版社,2002.
[9]景锋,盛谦,张勇慧,等.中国大陆浅层地壳实测地应力分布规律研究[J].岩石力学与工程学报,2007,26(10):2056-2062.JING Feng,SHENG Qian,ZHANG Yong-hui,et al.Research on distribution rule of shallow crustalgeostress in China mainland[J].Chinese Journal ofRock Mechanics and Engineering,2007,26(10):2056-2062.(in Chinese).
[10]赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析[J].岩石力学与工程学报,2007,26(6):1265-1271.ZHAO De-an,CHEN Zhi-min,CAI Xiao-lin,et al.Analysis of distribution rule of geostress in China[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1265-1271.(in Chinese).
[11]李银平,刘江,杨春和.泥岩夹层对盐岩变形和破损特征的影响分析[J].岩石力学与工程学报,2006,5(12):461-2466.LI Yin-ping,LIU Jiang,YANG Chun-he.Influence ofmudstone interlayer on deformation and failure char-acteristics of salt rock[J].Chinese Journal of RockMechanics and Engineering.2006,5(12):461-2466.(in Chinese).
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