DEVELOPMENT LAW AND PREDICTION OF THE LOWER-ORDER FAULTS IN THE WEST OF ZHENWU FAULT ZONE IN GAOYOU SAG
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摘要:
在应用蚂蚁追踪技术对真武断裂带西部低级序断层进行解释并根据主要断层走向确定阜宁期构造应力方向的基础上，应用构造应力场数值模拟法模拟阜宁期古构造应力的分布，从应力的角度对低级序断层的平面及剖面发育规律进行预测，最后将预测结果与构造解析结果进行对比。研究结果表明，应用蚂蚁追踪技术对低级序断层进行解释获得的蚂蚁属性体断裂痕迹清晰直观，应用效果要优于相干体技术、方差体技术等其他地震属性技术；真武断裂带西部阜宁期最小主应力方向为NW333°-SE153°；低级序断层的发育主要受阜宁期最小主应力及剪应力控制，最小主应力控制断层的优势发育区，平面剪应力控制断层的平面展布，左旋剪应力区主要发育近东西走向断层，右旋剪应力区主要发育北东走向断层，剖面剪应力控制断层的倾向，左旋剪应力区主要发育北倾、西倾断层，右旋剪应力区主要发育南倾、东倾断层。
Abstract:On the basis of the application of ant tracking technology in the lower-order faults interpretation and determining the structural stress direction of Funing sedimentary period according to the main fault strike in Zhenwu fault zone, the method of numerical simulation of tectonic stress field was applied to simulate the distribution of structural stress in Funing sedimentary period, and then the development law of the lower-order faults both on the plane and profile were predicted from the perspective of stress, finally, the prediction result was compared to the structural analysis result. The results show that the fault traces are clear and intuitive in the attribute volume obtained by using the ant tracking technology to explain the lower-order faults, the application is more effective than some other seismic attribute technology such as the coherence and variance technique. The minimum principal stress direction was nearly NW333°-SE153° in the west of Zhenwu fault zone in Funing sedimentary period. The development of the lower-order faults were mainly controlled by the minimum principal stress and shear stress, the minimum principal stress control the advantage area of the fault development, the plane shear stress control the planar distribution, the fault were developed with nearly EW strikes in sinistral shear stress area and nearly NE strikes in dextral shear stress area, the profile shear stress control the fault tendency, the fault were developed with N and W tendency in sinistral shear stress area and S and E tendency in dextral shear stress area.
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表 1 阜宁期构造应力场模拟力学参数
Table 1. Mechanical parameters simulating structural stress field in Funing Formation sedimentary period
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