瞬变电磁法三维数据模拟及应用效果
3D Data Simulation of TEM Method and its Exploration Application
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摘要: 借助三维正演数值模拟获取已知矿点上的瞬变电磁法（TEM）响应理论曲线，从理论上证明了在锡铁山铅锌矿区开展TEM方法工作的有效性。笔者主要以锡铁山典型铅锌矿床为例，讨论瞬变电磁三维正演数值模拟在该类型矿床的应用效果，并通过实测剖面进行验证。通过在锡铁山断层沟地区已知矿点上的TEM中心回线和重叠回线对比试验工作，确定了一套适合该地区寻找铅锌矿体的TEM工作方法参数，说明TEM响应电位异常曲线能较好的反映规则低阻异常体，背景场响应与主异常区响应幅值差较大、衰减稳定，能有效分辨不同深度矿致异常的能力。
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关键词:
- 瞬变电磁法(TEM) /
- 锡铁山断层沟 /
- 中心回线和重叠回线 /
- 深边部找矿 /
- 三维数值模拟
Abstract: By using the modeling test of 3D simulation, the response potential curves of TEM has been obtained for discovering mineral occurrence. Thus, the TEM method has been proved as an effective method for prospecting in this mining area.A set of TEM method parameters for Pb-Zn ore bodies are determined by comparing the test works between TEM central loops andsuperimposed loops in Duancenggou district of the Xitieshan mining area. The TEM response potential abnormal curve can reflect the abnormal feature of low resistance object effectively. The response amplitude has large ambient field and its anomaly area with stable attenuation, which has an effective ability to distinguish the mineralization anomalies at different depth. -
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