| 赵振华,牛英杰,刘建权,孔祥栋,刘钧沅,刘仕刚.老挝爬奔金矿勘查中EH-4电磁测深应用效果分析[J].地质找矿论丛,2024,39(4):552-557 |
| 老挝爬奔金矿勘查中EH-4电磁测深应用效果分析 |
| Effect of application of EH-4 electromagnetic sounding to prospecting in Phapon Au deposit in Laos |
| 投稿时间：2024-06-11 |
| DOI：10.6053/j.issn.1001-1412.2024.04.013 |
| 中文关键词: 爬奔金矿 电磁测深 EH-4 老挝 |
| 英文关键词:Phapon Au deposit Electromagnetic sounding EH-4 Laos |
| 基金项目:国外矿产资源风险勘查专项基金项目"老挝琅勃拉邦省巴乌县金铜多金属矿普查和详查(编号:201211B00200006)"资助。 |
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| 中文摘要: |
| 在老挝爬奔金矿勘查工作中,前期开展的EH-4电磁法剖面测量对寻找和圈定深部断裂、接触带或溶洞位置效果明显,但受地形影响,探索深度不够、不系统,信息干扰,不能满足现阶段揭示南部灰岩地质体深部埋深情况,未能全面真实反映深部构造信息。此次为开辟新的勘探方向,并研究砂岩覆盖区下灰岩空间形态变化及断裂构造特征,施测EH-4电磁测深剖面。本次共施测A、B、C三条EH-4电磁剖面,较为准确地推测出矿区内2条主要的NE向断裂位置,并在B、C剖面推测了4条含矿构造,勾绘出砂岩、粉砂岩与灰岩的分界线,同时C线深部产生的与A、B线明显不同的电阻率场值,推测其是寒武系、奥陶系老地层的反映。EH-4电磁测深方法技术成熟可靠,而且其勘探深度大,细节信息丰富,尤其能有效探测深部地质体,并能直观地反映出深部地质体的形态,对于深部地质构造也能较好地识别其位置、产状等。此方法生产效率高,成本又相对低,在地质勘探中能够提供较为准确的地层和构造信息,使其在经济及效率上都有非常明显的优势。 |
| 英文摘要: |
| The previous EH-4 electromagnetic profile survey is effective to locate deep fault, contact zone and karst cave in Phapon Au deposit but can not meet retirement of revealing burried situation of limestone and reflecting actual information of deep structure due to top-graphic influence, sounding depth and information interference. This time long EH-4 electromagnetic sounding profile survey is conducted to explore new prospecting direction and make clear spatial change of limestone and charactteristics of faults under cover of sandstone. EH-4 electromagnetic sounding profile A, B and C are measured. Two major EW faults are relatively located, four ore-bearing fractures inferred, boundaries of sandstone, siltstone and limestone outlined through measurement of profile B and C. To depth of profile C values of resistability field measured differ from those of profile A and B. The different value is inferred to be from older Cambrian and ordovician strata. The electromagnetic sounding method is mature and reliable and provide big sounding depth and abundant detail information. Especially it is effective to detect deep geological bodies and visually reflects morphology of the bodies and location, occurrences of deep structures with lower cost. The method should be popularized. |
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