| 提高管线探测水平分辨率的技术方法 |
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| 引用本文： | 陈谦,;梁延广,;王争明,;田增台.提高管线探测水平分辨率的技术方法[J].中国煤炭地质,2008(9):64-67. |
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| 作者姓名： | 陈谦 ;梁延广 ;王争明 ;田增台 |
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| 作者单位： | [1]河南省地球物理工程勘察院,河南郑州450053; [2]中石油华东勘探设计研究院,山东青岛266071 |
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| 摘 要： | 在平顶山矿工路路面改造工程中,使用GX-2型及RD-4000型地下管线探测仪探测地下管网布设情况。根据地下管线种类、管线布设方位、埋置深度、探测难度大小进行了多次试验,在此基础上确定了电磁探测技术与方法：利用直连法提高被测管线中的交变电流,压制邻近平行管线和地下介质中的异常反映;在多管并存、且间距较小的情况下,应选择“梯度法”对磁场水平分量垂直梯度ΔHx进行观测,以得到最大清晰异常;另外,还应根据具体情况,合理选择诸如压制旁侧管线法、选择发射法、偏移感应法、动源发射法等发射方式,保证目标管线中有较强异常呈现。在管线密集区,应尽可能地降低工作频率,以减小旁侧管线中产生的二次电流及二次磁场;为防止信噪比下降,可适当减小收发距,以提高接收机的灵敏度。
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| 关 键 词： | 管线探测 压制旁侧管线法 选择发射法 偏移感应法 动源发射法 电磁探测技术 |
Technical Methods to Improve Pipeline Detection Horizontal Resolution |
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| Institution: | Chen Qian, Liang Yanguang, Wang Zhengming and Tian Zengtai (1. Henan Provincial Geophysical Engineering Prospecting Institute, Zhengzhou, Henan 450053; 2. East China Exploration, Design and Research Institute, CNPC, Qingdao, Shandong 266071) |
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| Abstract: | To detect underground pipeline network layout, the GX-2 and RD-4000 underground pipeline detector were used in pavement reconstruction engineering of the Kuanggong Road, Pingdingshan. According to pipeline kind, layout orientation, depth and detecting degree of difficulty carried out tests many times and then the EM probing was selected. Use direct connecting to improve alternating current in pipeline detected, suppress anomalous reflection from neighboring parallel pipelines and underground media. In case of multiple pipelines coexisting and interval between is small, the ＂gradient method＂ should be selected to observe magnetic field horizontal component vertical gradient AHx to obtain clearest anomalies. In addition, based on specific condition, methods of flanking pipeline suppression, selective transmitting, deviated induction, moving-source transmitting are selected in reason to ensure stronger target pipeline anomaly presentation. In pipeline compact districts, should lower down operating frequency as far as possible to reduce secondary current and magnetic field produced by franking pipelines. To prevent S/N ratio declining, can cut down T-R spacing properly to improve receiver sensitivity. |
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| Keywords: | pipeline detection flanking pipeline suppression method selective transmitting method deviated induction method moving-source transmitting method EM probing technology |
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