地面高精度磁测在金矿勘查中的应用效果

论述了金矿勘查中地面高精度磁测野外工作方法的技术特点和保证高精度的技术措施，以及金矿区高精度磁测观测数据的处理方法和解释方法，并通过实例说明高精度磁测在金矿勘查中的应用效果。     

内蒙花敖包特银铅锌矿床高精度磁测找矿模式

地面高精度磁测技术在花敖包特银铅锌矿区及外围找矿中的成功应用,证明了在第四系覆盖较高的地区,运用该方法找矿具有分辨弱磁性能力强以及勘探效率高、成本低、效果好等特点;对矿区不同地段的地面高精度磁测资料进行了数据处理与解译,总结并建立了矿区高精度磁测地球物理找矿模式,为矿区及外围的进一步勘探提供了依据。     

高精度磁测资料的三维反演及找煤地质意义

采用精细的正演和拟神经网络反演技术对邯郸矿区北李庄井田的高磁资料进行正演,反演研究和资料分析,针对本地区磁场的特点,用先进的位场正演和分离技术将本区上,下层火成岩的磁场进行了分离,在此基础上对下层火成岩磁场进行三维反演,确定了下层火成岩的底界埋深及厚度,并据此提供了进一步找煤的勘探孔位。在其他物探方法难以取得找煤效果的情况下,该方法保证了高精度磁测工作在本区的有效性。     

地磁2．5D剖面反演在西藏某磁铁矿区的应用解释

高精度磁测是一种直接寻找磁铁矿的有效方法,但由于磁法存在纵向分辨率低的缺点,浅部磁性变化往往又对磁异常影响很大。本文结合矿区地质资料,依据矿区物性参数、成矿模式,使用2．5D剖面人机交互正反演技术对矿区内几个典型的磁异常进行定量反演,结合对矿区铁矿情况进行了定量分析,为矿区进一步工作提供了依据。     

磁场波数域正则化化极方法及应用

使用磁场波数域正则化化极方法，对干扰严重的中低纬度航磁异常数据化极，能压制磁南北向的条带状干扰，获得稳定结果；对含有较高噪声水平的高精度地面磁测ΔＴ异常化极，不论纬度高低，都能较大程度地压低噪声水平，获得高质量的化极结果。     

物探方法寻找隐伏岩浆岩型铜镍矿床

岩浆岩型铜镍矿床与超基性岩体密切相关,采用高精度磁测法及大功率TEM法,对金川Ⅰ、Ⅱ矿区已知矿深边部及下盘进行了探测,并对隐伏超基性岩体及含矿性作出了评价。在矿区南延普查区,对地表基性-超基性岩地质地球化学异常区,采用高精度磁测圈出了可能存在的中深隐伏超基性岩体异常带。在异常带上选择M-2-4异常段,进行大功率TEM探测,发现了深部低阻异常地段,为南延区深部找矿前景的评价提供了依据。     

高精度磁测在青海某工区间接寻找金锑多金属矿床的应用

磁法勘探作为一种重要的地球物理勘探方法,在各种金属非金属矿产勘察工作中有着不可替代的作用。本文以青海某矿区高精度磁测的工作成果为例,说明该方法在寻找金锑多金属矿床方面具有广阔的前景。通过对矿区内主要出露岩矿石进行物性测定,大致了解了区内岩矿石的磁性特征,然后通过对高精度地面磁测工作结果进行处理和分析,划定了五个磁异常区域。并对典型的局部磁异常进行了分析,初步划分出了有一定找矿意义的异常(M2、M7、M13、M14),重点异常(M3、M5、M6、M8)和无找矿意义的非矿致异常(M1、M9、M10),为后续地质工作提供了一定的参考。     

根据地震勘查信息预测火成岩储集体

由于火成岩具有极强的非均质性，对其识别与预测是油气勘探的难题之一。油气勘探首次综合使用地震速度分析、地震相分析、三瞬信息分析，以及深、浅侧向非常规测井约束反演等技术和方法，有效地识别了胜利油田济阳坳陷三类火成岩储集体：火山碎屑锥体、溢流玄武岩体和辉绿岩侵入体，圈定出它们的横向展布并成功地进行了裂缝储集体的预测，为火成岩油气藏的勘探开发提供了理论依据和技术方法。     

高精度磁测在沉积型磁铁矿区的找矿效果

沉积型磁铁矿脉特点是矿脉宽度小,品位低,综合磁性不均匀。通过对已知矿体进行剖面测量,证明高精度磁测的有效性,对野外实测数据进行日变校正、正常场校正、高度校正、水平梯度校正,化极、向上延拓、求取垂向二阶导数,以及对实测磁异常剖面进行人机对话反演等处理获得良好的效果。本次高精度磁测工作查明了矿区内磁铁矿（化）体的空间分布范围及大致埋深情况,圈定了几个有价值的磁铁矿（化）体靶区,取得了良好的找矿效果。     

综合物探方法在单竹坑多金属矿区的找矿应用

为了在单竹坑多金属矿区取得良好的找矿效果,采用高精度磁测与可控源(CSAMT)相结合的方法对工作区进行研究,提出了磁测扫面先行,磁法数据进行小波多尺度分解进而圈定磁源深度,可控源在磁法异常区进行标量测试进一步探深的工作方法组合,为以后的找矿提供了良好的技术支撑。     

高精度磁测在黄沙泉铁矿勘查中的应用

为了在甘肃省肃南县黄沙泉铁矿开展探矿工作,首先对矿区的地质特征和岩(矿)石磁性特征进行分析,然后在矿区进行1:10000高精度磁法测量,通过磁测剖面测量,对磁铁矿体及隐伏矿体埋深及产状进行进一步推测。结果表明,磁法测量是该区寻找磁铁矿和隐伏矿体的最直接、最有效的方法之一,可以为探矿工程提供依据。     

多层烧变岩磁异常正演模拟研究

根据烧变岩磁性分布规律和实测磁异常特征,建立了烧变岩地质－地球物理模型．采用归一化方法,以上层烧变岩几何参数为单位,改变下层烧变岩几何参数,对两层烧变岩叠加磁异常进行了正演模拟;分析了两层烧变岩叠加磁异常特征,确定了根据叠加磁异常识别下层烧变岩存在的条件,为实测磁异常反演解释奠定了理论基础     

Top coal caving mining technique in thick coal seam beneath the earth dam

It is important to study the mining technology under structures for raising the coal resources recovery ratio. Based on the geological and mining conditions, the top coal caving harmonic mining technique in thick coal seam beneath the earth dam was put forward and studied. The 5 factors such as the panel mining direction, panel size, panel location, panel mining sequence and panel advance velocity were taken into account in this technique. The dam movement and deformation were predicted after the thick coal seam mining and the effects of mining on the dam were studied. By setting up the surveying stations on the dam, the movement and deformation of the dam were observed during mining. By taking some protective measures on the dam, the top coal caving mining technique in thick coal seam beneath the earth dam was carried out successfully. The study demonstrates that harmonic mining in thick coal seam is feasible under the dam. The safety of the earth dam after mining was ensured and the coal resources recovery ratio was improved.     

根据磁异常确定磁性体上顶埋深的几种反演方法——以尕林格矿区磁测资料解释为例

根据磁异常确定磁性体上顶埋深是磁法勘探中寻找磁性物体及磁性矿床的重要问题之一。笔者总结了4种用磁异常确定磁性体上顶埋深的反演方法,它们是切线法、欧拉法、功率谱法、磁化强度成像法。本文首先将这4种方法用于板状体模型的反演,反演深度与板状体实际深度一致。然后,将它们应用于青海省尕林格矿区地面高精度磁测资料的反演解释,以勘查被广厚的第四纪砂砾沉积覆盖的磁铁矿,取得较好找矿效果。     

Time-domain characteristics of overlying strata failure under condition of longwall ascending mining

Ascending mining is one of the most effective ways to solve problems of water inrush, gas outburst and rock burst in coal seams mining. In order to reveal the law of motion and spatiotemporal relationship of overlaying strata, field measurement has been done in a mine. Long distance drillings were constructed from 4# coal seam to 6# coal seam at several certain typical positions, and movement and failure law of overlying strata after mining was analyzed by drilling video and observing the fluid leakage. Besides, we also analyzed the spatiotemporal development law of overlying strata failure with different mining heights and time intervals in the lower coal seam. The results show that: ascending mining is significantly affected by time-domain characteristics of overlaying strata failure after the lower coal seam’s mining, height equations of caving zone and fractured zone are given in this paper, and the feasibility of ascending mining was compartmentalized concretely according to the spatiotemporal relationship. Research methods and conclusions of this paper have certain referential significance for the study of ascending mining, mining under water, mining under building, mining under railway and stress-relief mining.     

安家岭露天煤矿端帮采煤方法研究

将井工开采的放顶煤采煤技术应用于平朔安家岭露天煤矿端帮煤开采,提出了“煤墙支撑简易放顶煤”采煤法。该法将煤层全厚分为上下两个采掘层,每个采掘层又分为上下两个分层,采掘下分层时用单体液压支架支护,采掘上分层时采用顶板放炮民落煤,采掘的煤层厚度可达10m以上,此种采煤方法具有安全可靠,资源回收率高、作业效率高等优点。     

高瓦斯矿井一次采全高综采工作面瓦斯治理

介绍了晋城矿区寺河矿高瓦斯矿井一次采全高工作面瓦斯治理方法和瓦斯利用情况,提出了高瓦斯矿井一次采全高工作面瓦斯治理途径和技术,指出高瓦斯矿井高产高效、安全生产的根本出路在于提高瓦斯抽放率,加强瓦斯利用,进而提高矿井的综合效益.     

Influence of different mining layouts on the mechanical properties of coal

Non-pillar mining, top-coal caving and protected coal seam mining are the most popular mining methods in coal exploitation, and the different mining layouts will change the stress state and failure mechanism of coal in front of the working face. In this paper, mining-induced mechanical behaviors under three mining layouts have been simulated in the laboratory to investigate the effects of mining layouts on the deformation and strength of coal. Furthermore, the coal failure mechanism under different mining layouts is analyzed microscopically. The experimental results indicate that the stage characteristics of the coal deformation are obvious. Under the serial action of non-pillar mining, top-coal caving and protected coal seam mining layouts, the values of radial deformation, volume strain and Poisson’s ratio increase, while the peak strength and deformation modulus decrease at the same buried depth, and the peak strength under non-pillar mining, top-coal caving and protected coal seam mining is about 3.0, 2.5 and 2.0 times of the initial confining pressure, respectively. The results also indicate that the trend of the coal deformation decreases with the increase of the buried depth under the same mining layout, while the strength and deformation modulus increase, and the failure mechanism under three mining layouts is dominated with shear/tensile failure.     

瞬变电磁法在煤矿采空区探测中的应用研究

从煤矿采空区的危害和探测的现实意义出发,介绍了瞬变电磁法的探测原理及在国内煤矿采空区探测中的应用现状。根据生产中常遇到的采空区及一般电性异常表现对采空区做了归纳分类,总结了采空区的一般定位解释方法,并通过生产实例说明了方法的实用和有效性。文章旨在为今后煤矿采空区探测提供一定的借鉴经验。