The dual transmitter implements the equivalent anti-magnetic flux transient electromagnetic method, which can effectively reduce the scope of the transient electromagnetic detection blind area. However, this method is...The dual transmitter implements the equivalent anti-magnetic flux transient electromagnetic method, which can effectively reduce the scope of the transient electromagnetic detection blind area. However, this method is rarely reported in the detection of pipelines in urban geophysical exploration and the application of coal mines. Based on this, this paper realizes the equivalent anti-magnetic flux transient electromagnetic method based on the dual launcher. The suppression effect of this method on the blind area is analyzed by physical simulation. And the detection experiment of underground pipelines is carried out outdoors. The results show that the dual launcher can significantly reduce the turn-off time, thereby effectively reducing the impact of the blind area on the detection results, and the pipeline detection results verify the device’s effectiveness. Finally, based on the ground experimental results, the application prospect of mine advanced detection is discussed. Compared with other detection fields, the formation of blind areas is mainly caused by the equipment. If the dual launcher can be used to reduce the blind area, the accuracy of advanced detection can be improved more effectively. The above research results are of great significance for improving the detection accuracy of the underground transient electromagnetic method.展开更多
Traditional geophysical prospecting methods( electromagnetic induction method,high-density resistivity method and ground penetrating radar method) were applied to the environmental quality detection of reclaimed land ...Traditional geophysical prospecting methods( electromagnetic induction method,high-density resistivity method and ground penetrating radar method) were applied to the environmental quality detection of reclaimed land in the "198" area of Shanghai. According to the results of drilling sampling and laboratory analysis,the accuracy,suitability and consistency of theses geophysical prospecting methods were evaluated.展开更多
In Sidi Chennane deposits (Morocco), the phosphatic series is composed of regular interbedded phosphatic and marly limestone layers. Exploitation of the phosphate in these deposits collides frequently with problems bo...In Sidi Chennane deposits (Morocco), the phosphatic series is composed of regular interbedded phosphatic and marly limestone layers. Exploitation of the phosphate in these deposits collides frequently with problems bound to the existence, in this series, of sterile bodies qualified as derangements. They cause two kinds of problems: 1) as they are hard, compact and masked by a Quaternary cover, they disturb the exploitation in some yards and give bad reserve calculation;2) even the use of wells and mechanical boreholes did not evidence their delimitation. Our study shows that these bodies can be detected and delimited using ground penetrating radar and electrical resistivity tomography methods. It is based on the acquisition and the interpretation of series tests using these methods carried out above visible sterile bodies in a trench of exploitation in order to have geologically valid information. The article concerns to the analysis of the results and of the proceeding for a possible large geophysics survey.展开更多
广西那渠地区铀成矿潜力巨大,与铀共生的钼矿也达到可综合利用的程度。然而目前该区钼矿系统的勘查工作依然缺乏,致使钼矿的找矿勘查依据不足。为了优选那渠地区钼矿找矿靶区,在该区开展了1:10000土壤地球化学测量工作。系统采集了3295...广西那渠地区铀成矿潜力巨大,与铀共生的钼矿也达到可综合利用的程度。然而目前该区钼矿系统的勘查工作依然缺乏,致使钼矿的找矿勘查依据不足。为了优选那渠地区钼矿找矿靶区,在该区开展了1:10000土壤地球化学测量工作。系统采集了3295件土壤样品,分析了土壤中Au、Ag、As、Bi、Hg、W、Mo、Cu、V和Ti共10种元素的含量。多元统计分析显示Mo是该地区主成矿元素之一。运用统计学软件SPSS 22对原始数据进行R型聚类分析和R型因子分析,划分出Ag-Cu-V、Bi-Ti-W、As-Mo、Au和Hg五组成矿元素组合。采用衬度异常法计算各元素和元素组合的异常下限,运用Geochem Studio 3.5软件将各成矿元素组合衬度数据处理并绘制成异常图,结合地质条件共预测圈出3个找矿靶区。对Ⅰ号找矿靶区进行探槽和钻探工程验证,发现了一个工业钼矿体,钼品位0.11%~0.15%,平均值0.112%。对Ⅱ号找矿靶区开展探槽工程验证,通过刻槽取样分析,显示钼品位均达到了矿化标准。研究结果指示那渠地区钼的成矿潜力较大。展开更多
文摘The dual transmitter implements the equivalent anti-magnetic flux transient electromagnetic method, which can effectively reduce the scope of the transient electromagnetic detection blind area. However, this method is rarely reported in the detection of pipelines in urban geophysical exploration and the application of coal mines. Based on this, this paper realizes the equivalent anti-magnetic flux transient electromagnetic method based on the dual launcher. The suppression effect of this method on the blind area is analyzed by physical simulation. And the detection experiment of underground pipelines is carried out outdoors. The results show that the dual launcher can significantly reduce the turn-off time, thereby effectively reducing the impact of the blind area on the detection results, and the pipeline detection results verify the device’s effectiveness. Finally, based on the ground experimental results, the application prospect of mine advanced detection is discussed. Compared with other detection fields, the formation of blind areas is mainly caused by the equipment. If the dual launcher can be used to reduce the blind area, the accuracy of advanced detection can be improved more effectively. The above research results are of great significance for improving the detection accuracy of the underground transient electromagnetic method.
文摘Traditional geophysical prospecting methods( electromagnetic induction method,high-density resistivity method and ground penetrating radar method) were applied to the environmental quality detection of reclaimed land in the "198" area of Shanghai. According to the results of drilling sampling and laboratory analysis,the accuracy,suitability and consistency of theses geophysical prospecting methods were evaluated.
基金part of the A/3820/05 and A/025780/09 Projects,financed by the Spanish Agency of International Cooperation(AECI,PCI-Mediterranean)support of the integrated action MA/209/09(Morocco-French,volubilis program).
文摘In Sidi Chennane deposits (Morocco), the phosphatic series is composed of regular interbedded phosphatic and marly limestone layers. Exploitation of the phosphate in these deposits collides frequently with problems bound to the existence, in this series, of sterile bodies qualified as derangements. They cause two kinds of problems: 1) as they are hard, compact and masked by a Quaternary cover, they disturb the exploitation in some yards and give bad reserve calculation;2) even the use of wells and mechanical boreholes did not evidence their delimitation. Our study shows that these bodies can be detected and delimited using ground penetrating radar and electrical resistivity tomography methods. It is based on the acquisition and the interpretation of series tests using these methods carried out above visible sterile bodies in a trench of exploitation in order to have geologically valid information. The article concerns to the analysis of the results and of the proceeding for a possible large geophysics survey.
文摘广西那渠地区铀成矿潜力巨大,与铀共生的钼矿也达到可综合利用的程度。然而目前该区钼矿系统的勘查工作依然缺乏,致使钼矿的找矿勘查依据不足。为了优选那渠地区钼矿找矿靶区,在该区开展了1:10000土壤地球化学测量工作。系统采集了3295件土壤样品,分析了土壤中Au、Ag、As、Bi、Hg、W、Mo、Cu、V和Ti共10种元素的含量。多元统计分析显示Mo是该地区主成矿元素之一。运用统计学软件SPSS 22对原始数据进行R型聚类分析和R型因子分析,划分出Ag-Cu-V、Bi-Ti-W、As-Mo、Au和Hg五组成矿元素组合。采用衬度异常法计算各元素和元素组合的异常下限,运用Geochem Studio 3.5软件将各成矿元素组合衬度数据处理并绘制成异常图,结合地质条件共预测圈出3个找矿靶区。对Ⅰ号找矿靶区进行探槽和钻探工程验证,发现了一个工业钼矿体,钼品位0.11%~0.15%,平均值0.112%。对Ⅱ号找矿靶区开展探槽工程验证,通过刻槽取样分析,显示钼品位均达到了矿化标准。研究结果指示那渠地区钼的成矿潜力较大。
