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基于钻孔摄像的深层磁性矿脉延伸方向研究
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摘要
在深部岩体中,原生特征保存较好,岩体中存在着一定的原生结构面,如流纹、层面等,这些结构面在一定程度上能够反映矿脉的延伸方向。在非磁性矿区内,通过数字式全景钻孔摄像系统能够直接获取到钻孔内的360°展开图和结构面的详细信息;在磁性矿区内,由于受到磁性矿体的影响,需结合陀螺仪和磁性仪在钻孔内的测试数据对获取的结构面产状信息进行方位修正,修正后的结构面产状即是钻孔内结构面真实产状。利用上述获得的结构面信息进行分析和统计,提出新的判断深层矿脉延伸方向的研究方法。主要成果以及创新点如下:
     1.由于数字式全景钻孔摄像系统利用磁性罗盘定位,因而在磁性矿内进行测试定位不准确。在磁性矿区,先结合陀螺仪和磁性仪的应用,提出磁性影响角的概念,测定出磁性矿区钻孔内的磁性影响角;再通过磁性影响角对钻孔摄像获取的结构面产状进行方位修正。在磁性矿区内,通过该方法能够获取到可靠的结构面产状信息。
     2.通过对成矿理论进行研究,成矿过程中存在着矿源、其矿源物质运输和堆积过程,在矿源物质运输过程中产生了原生结构面;这些结构面在深部岩体中得到了较好的保存,通过数字式全景钻孔摄像系统能够详细地获取这些结构面信息。对这些结构面产状进行分段处理,对各段进行产状矢量均值化;经过分段式处理,使得钻孔内结构面信息得到合理利用,避免了局部结构面集中对于整孔的分析影响。通过将得到的各段产状矢量均值作为各段代表性产状,对各段在两两钻孔之间进行岩脉延伸性计算,经过对钻孔内各分段延展性进行分析和统计后,判断整体深部矿脉的延伸方向。
     综上所述,文本提出了在磁性矿区内应用陀螺仪和磁性仪测定钻孔内磁性影响角方法,以及利用磁性影响角修正钻孔摄像系统获取的结构面产状。通过对整孔内的结构面进行分段式处理,研究各分段的延伸方向,从而判断整体矿脉的延伸方向。以安徽省金寨沙坪沟钼矿(非磁性矿)和霍邱重新集石英磁铁矿(磁性矿)为例,通过对两个矿区内钻孔进行数字式全景钻孔摄像系统的应用,以及在磁铁矿钻孔内利用陀螺仪和磁性仪测定数据,通过本文所述的产状修正方法和分段延伸方向的研究方法,对判断深部矿脉延伸方向提供了指导性信息。
In the deep strata, because original features are well preserved, so primary structure planes also are well preserved, Such as flow pattern, level, etc, which generally reflect extension direction of vein. In the non-magnetic mines, the Digital Panoramic Borehole Camera System (DPBCS) may directly produce 360°image of the borehole-wall, and obtain detailed information on structure plane occurrence. But the information on structure plane occurrence, obtained by DPBCS, may be affected by magnetic mine, so the DPBCS should be used with other instruments, which are gyro and magnetic instrument, in the magnetic mine. The gyro and magnetic instrument are used to get the angles affected by magnetic mine in borehole, which are used for correcting the information on structure plane occurrences. According to the information corrected, a new method that determines extension direction of vein is discussed. Main research achievements as follows:
     1. as the DPBCS using magnetic compass to determine drilling position, the information on structure plane occurrences obtained by the DPBCS is inaccurate. In the magnetic mine, the information could be corrected by using those instruments, such as gyro and magnetic instrument, which may get the angles affected by magnetic mine, so the information corrected is reliable.
     2. according to study on metallogenic theory, there are mineral source, mineral removal and mineral accumulation in process of deposit formation, so primary structure plane, which may be obtained by the DPBCS in detail, may be generated and well stored in deep vein. The information is piece wise dealt with, and global mean vector be got in each section; so the information be effectively used to avoid structure plane concentration in the whole borehole for determining extension direction of vein. The globe mean vector is used as a representative occurrence of in each section, which is used to study extension direction of vein between the drillings, so the overall extension direction of deep vein will be determined after each section is analyzed and counted.
     In summary, the dissertation offers a new method to obtain the reliable structure plane occurrence information with using the DPBCS, the gyro and magnetic instrument. These equipments could get the angle affected by magnetic mine in borehole, which is used to correct the occurrence information obtained by the DPBCS. The reliable information is piece wise dealt with and studied extension direction of vein in each section between the drillings for determining the overall extension direction of deep vein. The dissertation takes Shapinggou molybdenum mine (non-magnetic ore) in Jinzhai county and quartz magnetite (magnetic ore) in Huoqiu county Anhui Province, which provides different test environments, as example to exert above method that provides some guidance in judging the extension direction of vein.
引文
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