银川地堑主要隐伏活动断层精定位与计算机制图

发布时间：2019-05-08 08:13

【摘要】：本论文选取银川地堑中银川和芦花台两条隐伏断层为研究对象。在以银川隐伏断层为例论述了隐伏断层探测的基本思路、原则、方法和步骤的基础上,着重以芦花台隐伏断层为例,探讨隐伏活动断层精定位技术以及计算机制图方法。对芦花台隐伏断层实施了浅层地震勘探,查明其总体走向为NNE,倾向为SEE,倾角为73~78°。根据取自钻孔的地层样品沉积年龄测定,又将主断层分为南段和北段。南段的活动时代为中更新世,而北段的活动时代为全新世。通过对浅层地震勘探断层上断点向上延伸计算,使其与钻探得到的断层上断点埋深相匹配。通过断层的精确定位,得到了芦花台隐伏断层在浅表的几何分布、产状及活动性分段特征的认识。在芦花台隐伏段层精定位基础上,根据上延计算结果、探测误差、地震现场考察结果计算出芦花台隐伏断层全新世活动段避让带宽度为:87-98m。根据避让带宽度值,利用Arc GIS缓冲区研究方法绘制出了避让带范围。所得成果为石嘴山市城市辖区内的建设提供了重要参考依据。最后以芦花台隐伏断层为例阐述了利用GIS技术处理探测资料,绘制成果图件的方法。本论文研究中使用Arc GIS软件绘制完成了1:250 000工作区地震构造图、石嘴山目标区1:50 000活动断层分布图、1:50 000芦花台隐伏断层实际材料图、1:10 000芦花台隐伏活动断层带状分布图和1:10 000芦花台隐伏活动断层避让带分布图,这些图件最终以五个制图文档(mxd文件)和一个空间数据库存储。
[Abstract]:In this paper, two hidden faults, Yinchuan and Luhuatai, in Yinchuan graben are selected as research objects. Taking Yinchuan hidden fault as an example, the basic ideas, principles, methods and steps of hidden fault detection are discussed. Taking Luhuatai hidden fault as an example, the fine location technique of concealed active fault and the computer mapping method are discussed. The shallow seismic exploration of Luhuatai concealed fault has been carried out. It is found that the general strike of the fault is NNE, inclined to SEE, dip angle of 73 掳to 78 掳. The main fault is divided into the south and north segments according to the sedimentary age of the strata samples taken from the borehole. The activity age of the southern segment is Middle Pleistocene, while the activity age of the northern segment is Holocene. By calculating the upward extension of the fault break point in shallow seismic exploration, it matches the buried depth of the fault break point obtained by drilling. Based on the accurate location of faults, the geometric distribution, occurrence and active segmented characteristics of Luhuatai concealed fault are obtained. Based on the precise location of the hidden section of Luhuatai station, according to the results of up-extending calculation, the detection error and the results of seismic field investigation, the width of the avoidance zone of the Holocene active segment of the Luhuatai hidden fault is calculated as follows: 87? 98m. According to the value of the avoiding bandwidth, the range of the avoiding band is drawn by using the Arc GIS buffer research method. The results provide an important reference for the construction of Shizuishan city area. Finally, taking Luhuatai hidden fault as an example, this paper expounds the method of processing exploration data and drawing achievement map by using GIS technology. In this paper, the Arc GIS software is used to draw the seismotectonic map of 1 ~ 250,000 working area, 1:50 active fault distribution map of Shizuishan target area and 1:50 actual material map of Luhuatai hidden fault. The 1:10 map of the hidden active fault banded distribution at the Luhua platform and the 1:10 distribution map of the concealed active fault avoidance zone at the Luhua platform were eventually stored in five cartographic documents (mxd files) and a spatial database.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.6

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