走滑断裂叠置拉张区构造变形的物理模拟及启示
发布时间：2019-02-21 09:28
【摘要】：走滑断层的走滑量研究是构造分析过程中的关键,本文运用走滑断裂拉张叠置部位的构造物理模拟方法作为走滑量求取的手段,利用与自然界吻合程度较好的脆性-塑性双层模型对走滑拉张叠置部位进行模拟,发现叠置区主要发育与主边界断层呈80°~90°的横向断层(T断层)和呈顺时针45°的斜向断层(R剪切)两种类型的次级断层。通过改变实验中走滑断裂的叠置长度、横向间隔距离以及走滑量,计算不同实验中横向断层与斜向断层数量的比例并对实测数据进行拟合,结果显示:(1)叠置长度以及走滑量的增加或者横向间隔距离的减小,都会导致横向断层与斜向断层数量比的增加;(2)每组实验中的上述四个实测变量之间存在着特定的对数关系,通过对自然界中的走滑断裂拉张叠置区进行同比例缩小的构造物理模拟实验,获得四者之间的函数关系,从而可以确定走滑量。将构造物理模拟计算走滑量方法应用于渤海海域辽东湾地区郯庐断裂带,得到其新构造运动以来约发生了2.1 km的右旋走滑活动。
[Abstract]:The study of strike-slip quantity of strike-slip fault is the key in the process of structural analysis. In this paper, the method of structural physical simulation of the extension and tension superposition of strike-slip fault is used as the means of calculating the strike-slip quantity. The brittleness plastic double layer model, which is in good agreement with nature, is used to simulate the superposition of strike-slip tension. It is found that there are two main types of secondary faults in the overlay area: transverse fault (T fault) with 80 掳~ 90 掳main boundary fault and oblique fault (R shear) with 45 掳clockwise. By changing the overlay length, transverse distance and strike-slip amount of strike-slip faults in experiments, the ratio of transverse faults to oblique faults in different experiments is calculated and the measured data are fitted. The results show that: (1) the increase of overlay length, the amount of strike-slip or the decrease of transverse distance will lead to the increase of the ratio of transverse fault to oblique fault; (2) there is a specific logarithmic relationship between the four measured variables in each group of experiments. The functional relationship between the four variables is obtained by the structural physical simulation experiment of the same proportion of the strike-slip fault tension and overlay area in nature. Thus, the amount of strike-slip can be determined. The authors apply the structural physical simulation method to calculate the strike-slip amount in the Tan-Lu fault zone of Liaodong Bay area in the Bohai Sea. The dextral strike-slip activity of about 2.1 km has occurred since the neotectonic movement.
【作者单位】： 中海石油(中国)天津分公司渤海石油研究院;中国石油大学(华东)地球科学与技术学院;
【基金】：十二五国家科技重大专项课题(2011ZX05023-006-005)资助
【分类号】：P542
本文编号：2427424
[Abstract]:The study of strike-slip quantity of strike-slip fault is the key in the process of structural analysis. In this paper, the method of structural physical simulation of the extension and tension superposition of strike-slip fault is used as the means of calculating the strike-slip quantity. The brittleness plastic double layer model, which is in good agreement with nature, is used to simulate the superposition of strike-slip tension. It is found that there are two main types of secondary faults in the overlay area: transverse fault (T fault) with 80 掳~ 90 掳main boundary fault and oblique fault (R shear) with 45 掳clockwise. By changing the overlay length, transverse distance and strike-slip amount of strike-slip faults in experiments, the ratio of transverse faults to oblique faults in different experiments is calculated and the measured data are fitted. The results show that: (1) the increase of overlay length, the amount of strike-slip or the decrease of transverse distance will lead to the increase of the ratio of transverse fault to oblique fault; (2) there is a specific logarithmic relationship between the four measured variables in each group of experiments. The functional relationship between the four variables is obtained by the structural physical simulation experiment of the same proportion of the strike-slip fault tension and overlay area in nature. Thus, the amount of strike-slip can be determined. The authors apply the structural physical simulation method to calculate the strike-slip amount in the Tan-Lu fault zone of Liaodong Bay area in the Bohai Sea. The dextral strike-slip activity of about 2.1 km has occurred since the neotectonic movement.
【作者单位】： 中海石油(中国)天津分公司渤海石油研究院;中国石油大学(华东)地球科学与技术学院;
【基金】：十二五国家科技重大专项课题(2011ZX05023-006-005)资助
【分类号】：P542
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