Refined technique for susceptibility resolution into ferromagnetic and paramagnetic components based on susceptibility temperature-variation measurement   总被引：2，自引：0，他引：2  

Franti&#;ek Hrouda    Vit Jelínek  Karel Zapletal 《Geophysical Journal International》1997,129(3):715-719

The measurement of the temperature variation of magnetic susceptibility can be used for the separation of ferromagnetic and paramagnetic susceptibility components. The method suggested by Hrouda (1994) assumes a hyperbolic dependence of paramagnetic, susceptibility and constant ferromagnetic susceptibility in the temperature interval used for the separation. Our new method works with a paramagnetic hyperbola again, but assumes that the ferromagnetic susceptibility temperature variation is represented by a linear relationship in the resolution interval, as indicated by the investigation of monomineralic ferromagnetic fractions.  相似文献   

油气田微磁异常成因及性质研究的近期进展   总被引：1，自引：0，他引：1  

朱起煌 《地质科技情报》1992,11(1):49-55

微磁测量是80年代出现的一种成功的非常规油气勘探方法,它所检测的是与油气渗漏相关的次生磁性矿化作用。近期的大量研究表明,油气田上方的微磁乒常具有复杂多样的成因:(1)从烃类获得代谢能的硫酸盐还原茵的作用;(2)烃类的微生物降解作用;(3)硫化环境中形成的磁黄铁矿;(4)泥质岩中富铁粘土的自生菱铁矿化;(5)与油气源岩露头或油气藏渗漏有关的自燃变质带。此外,烃类在陆相红层中的磁效应可以受到赤铁矿溶离的干扰,使其磁化强度出现数量级的下降。  相似文献   

东海磁场特征的初步研究   总被引：2，自引：0，他引：2  

黄兆熊  高德章 《上海国土资源》1992,(1):12-23

东海磁场区域上呈现“东西分带、南北分块”的格局,根据磁场特征,自西向东可分为六个磁场区,为东海区域构造分区提供了地球物理场依据。东海磁场特征主要反映了上地壳的构造特征。本文结合东海断面重磁曲线的拟合成果,讨论了东海地壳结构、块体对接等问题。我们认为东海基底是晚中生代后由不同块体在不同时代对接而成,由西向东基底年代越来越新,地壳结构也由典型的陆壳过渡到典型的洋壳。  相似文献   

松辽盆地外围油气地质调查进展     

张世龙  康伟浩  任二峰  于小亮  薛长军  袁克全  蔡成龙 《地质与资源》1992,28(4):401-401

为高效直接地寻找祁连小水沟地区铁多金属矿区井底、井旁的隐伏矿体，通过采用井中三分磁测法，研究对比三分磁测测井资料ΔZ、ΔH'曲线及ΔT'矢量的变化规律寻找隐伏矿体.达到了科学减少钻孔数量，指导钻孔施工方向，较准确预测钻孔四周隐伏矿体，有效提高见矿率的效果.  相似文献   

传输铁塔对地磁观测台站影响的实验与排除     

林金狮  苏鸾声 《地震地磁观测与研究》1992,13(4):63-68

本文总结了地面上铁磁性物质感应磁场现场测量结果,较详细地描述其感应磁场的分布特征。它对地磁台站的建设与环境保护,分析与排除人为干扰因素有一定的参考意义。文中还分析菏泽地震遥测传输铁塔对地磁观测的干扰情况。结果认为,该铁塔的感应磁场没有影响到地磁观测台。  相似文献   

Near-surface distortion effects on controlled source magnetotelluric transfer functions     

W. Qian  L. B. Pedersen 《Geophysical Journal International》1992,108(3):833-847

  相似文献   

Magnetic anomaly lineations from Late Jurassic to Early Cretaceous in the west-central Pacific Ocean   总被引：1，自引：0，他引：1  

Masao Nakanishi  Kensaku Tamaki  Kazuo Kobayashi 《Geophysical Journal International》1992,109(3):701-719

  相似文献   

Generation of synthetic seismograms with layer reduction     

S. N. Bhattacharya 《Geophysical Journal International》1992,111(1):79-90

  相似文献   

流磁预报地震初探     

刘益乾  李金梅 《山西地震》1991,(4)

通过对晋、冀、蒙三省交界区长达11年的流动地磁资料的综合分析,以丰镇、大同-阳高地震为例,探讨了流磁资料预报地震的能力,震例表明震磁效应是明显的,认为以磁报震是一种有前途的方法。  相似文献   

On the use of the autocorrelation method for estimating the depth to the magnetic basement     

Jan Reidar Skilbrei  Ola Kihle 《Pure and Applied Geophysics》1992,138(3):501-506

The depth to the top of magnetic dykes can be estimated from total field aeromagnetic data using the relation between the depth to magnetic sources and the autocorrelation function of magnetic data. By using synthetic anomalies we show that in the ideal case, depth can be determined to an accuracy of 10% or better, when the anomaly sources are two-dimensional dykes. However, the estimated depths depend on the width of the dykes. The estimated depth is about 0.6 times the actual depth to the top of thin dykes, and around the true depth for thick dykes having width-to-depth ratio around 3. The depth is considerably overestimated for very thick dykes (e.g., contacts, which is a special case of the thick dyke). Thus, the autocorrelation method requires that the width-to-depth ratio of the dyke is estimated independently to correctly estimate the depths. Alternatively, it must be assumed that the width-to-depth ratio for the two-dimensional source body is between 1.5 and 4.  相似文献