自相关滤波方法及其在山东齐河—禹城铁矿勘查应用

doi:10.11720/wtyht.2022.1493

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摘要

山东齐河—禹城地区属于典型的厚覆盖区,深部隐伏铁矿在地表引起的地球物理异常相对较弱,因此提取铁矿引起的局部弱异常是该地区找矿预测的关键。自相关滤波方法采用一定波长的高通滤波压制区域场的影响,达到提取局部弱异常的目的。首先,通过建立不同规模和深度的铁矿模型和产生背景场的倾斜岩体模型,在此基础上正演获得叠加磁场,对该磁场进行自相关滤波方法处理,有效地提取了铁矿体产生的弱异常。而后,对齐河—禹城地区的实测数据进行处理,处理结果与钻孔资料进行对比,验证了方法的有效性。自相关滤波方法提取弱异常缩小了找矿范围,对圈定找矿有利部位和钻探验证具有重要指导意义。

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	吴成平
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	徐剑春
	徐东礼
	乔春贵

关键词 ：自相关滤波, 厚覆盖区, 深部铁矿, 弱异常

Abstract：

Deeply concealed iron ores cause relatively weak geophysical anomalies on the ground surface in the Qihe-Yucheng area, Shandong Province, a typical thickly covered area. Therefore, it is the key to the ore prospecting in this area to extract local weak anomalies caused by iron ores. Autocorrelation filtering can extract local weak anomalies by reducing the influence of a regional field using a high-pass filter of a certain wavelenth. The steps of the method are as follows. First, establish a model of incline plutons generating background field and models of iron ores of different scales and depths. Based on this, obtain the superimposed magnetic field through forward modeling. Then carry out autocorrelation filtering processing of the superimposed magnetic field to effectively extract the weak anomalies of iron ores. The autocorrelation filtering method was used to process the measured data in the Qihe-Yucheng area and the processing results were compared to the borehole data, verifying that the autocorrelation filtering method is effective. The extraction of weak anomalies using the autocorrelation filtering method allows for the ore prospecting scope to be reduced, which can provide guidance on the determination of prospecting favorable locations and drilling verification.

Key words： autocorrelation filtering thickly covered area deep iron ore weak anomaly

收稿日期: 2021-08-31 修回日期: 2021-09-26 出版日期: 2022-08-20

ZTFLH:

P631

基金资助:国家重点研发计划项目(2017YFC0602201)

通讯作者: 于长春

作者简介: 吴成平(1982-),教授级高级工程师,主要从事航空物探数据处理和综合解释工作。Email: chengpingwu@163.com

引用本文:

吴成平, 于长春, 熊盛青, 徐剑春, 徐东礼, 乔春贵. 自相关滤波方法及其在山东齐河—禹城铁矿勘查应用[J]. 物探与化探, 2022, 46(4): 940-945.
WU Cheng-Ping, YU Chang-Chun, XIONG Sheng-Qing, XU Jian-Chun, QIAO Chun-Gui. Application of autocorrelation filtering to iron ore prospecting in Qihe-Yucheng area, Shandong Province. Geophysical and Geochemical Exploration, 2022, 46(4): 940-945.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1493 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I4/940

Fig.1 地质模型在xy、xz、yz平面投影
a—模型在xy平面投影;b—模型在xz平面投影;c—模型在yz平面投影

Table 1 矿体模型参数

Fig.2 自相关滤波方法模型试验
a—地面正演ΔT异常;b—自相关滤波方法提取局部弱异常

Fig.3 研究区地质图(a)和航磁异常ΔT(b)

Fig.4 自相关滤波方法处理结果及钻孔分布

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