激电二次场衰减分布规律实验研究
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摘要
随着我国经济的快速发展,传统的铁矿资源越来越紧缺,相当部分依靠进口,迫切需要寻找和开发非传统的铁矿资源。我国河北等地区有丰富的超贫磁铁矿资源。然而,我国现在还缺乏寻找和开发非传统铁矿资源的数据资料,也没有相应的地质勘探规范。如何查明、开发利用这一资源,是摆在我们面前的重要课题。
激发极化法在直流电法中研究较为成熟,也是一种多金属矿产和水资源勘探比较有效的地球物理勘探技术手段。其装置选择多样,具有提供的物性参数多、反映地电信息丰富,但在解释方面存在多解性、多因素影响等特点。
本文利用激发极化理论,通过模拟实验对激电二次场进行更加深入的研究,主要研究了不同介质、全空间、半空间条件下二次场各参数的分布规律。
首先,采用室外土槽模拟实验的方法完成相同地质背景条件下不同电极距的探测;同一电极距相同条件下不同覆盖层厚度的激发极化探测。定量得出了半空间、全空间条件下视电阻率、视极化率的转换关系。
其次,采用室内模拟完成相同介质、相同湿度条件下不同电极距的探测;同一电极距相同条件下不同导电矿物含量的激发极化法探测。分析对比得出不同导电矿物含量与视电阻率、视极化率的定量关系,得出了二次场视极化率衰减规律与导电矿物含量为指数型函数关系。当达到超贫磁铁矿的可采边界品位时,指数函数系数a应大于2.31。
最后,在各种反演图件进行宏观定性分析基础上,利用数据优化得出视金属因素参数,并利用数据拟合得出超贫磁铁矿可采边界品位的控矿条件视金属因素应大于0.35(1/?·m)。结合其它参数建立了矿体判别模型。
With the quick development of the national economy, and the lack of the traditional iron resource,it is necessary to search and exploit the non-traditional iron resource. Hebei Province is rich in extremely low content magnetite. However, there is no data of searching and exploiting non-traditional iron resource and corresponding norm in China. How to find out and make full use of existing resources is an important subject.
Induced polarization method has been studied more mature in direct current method, but also is a effective geophysical exploration techniques for the exploration of multi-metallic mineral and water resources. It have variety of advantages ,such as many choices of installation, provided more physical parameters, reflecting the geoelectric information-rich, but have disadvantages, too. Such as the multiple solutions of interpretation, affected by multi-factors and so on. In order to meet the market demand for do more in-depth study of induced electrical in secondary field, so that it can make more data interpretation in line with the objective reality.
In this paper, using the induced polarization theory, studied the distribution of each parameter about secondary field under the conditions of different media, all-space, half-space by simulation test.
First, utilize soil box simulative test method to accomplish detecting with different electrode distances in the same condition, the same electrode distance under the same conditions from a different coating thickness by induced polarization method to detect. Quantitatively obtained the conversion relations of apparent resistivity and apparent polarizability in half-space to full space conditions.
Secondly, using indoor simulation test method under the same conditions to complete the detection of different electrode distance, the same electrode distance under the same conditions from a different conductive mineral content of the induced polarization method to detect. Analysis and comparison the quantitative relationship obtained with the apparent resistivity and apparent polarizability of different conductive mineral content. Discussed the exponential function relationship between attenuation of apparent polarizability in secondary field and conductivity of mineral content. Obtained that can be taken to achieve over clocking magnetite grade boundary, the exponential function coefficient should be larger than 2.31.
Finally, optimizing the use of data obtained apparent metallic modulus through the indoor data processing, conducted a qualitative analysis based on inversion maps. Fitting the data obtained after extremely low content magnetite grade boundary conditions for J greater than 0.35 (1/??m). Combined with other parameters establish a discriminant model of orebody.
激发极化法在直流电法中研究较为成熟,也是一种多金属矿产和水资源勘探比较有效的地球物理勘探技术手段。其装置选择多样,具有提供的物性参数多、反映地电信息丰富,但在解释方面存在多解性、多因素影响等特点。
本文利用激发极化理论,通过模拟实验对激电二次场进行更加深入的研究,主要研究了不同介质、全空间、半空间条件下二次场各参数的分布规律。
首先,采用室外土槽模拟实验的方法完成相同地质背景条件下不同电极距的探测;同一电极距相同条件下不同覆盖层厚度的激发极化探测。定量得出了半空间、全空间条件下视电阻率、视极化率的转换关系。
其次,采用室内模拟完成相同介质、相同湿度条件下不同电极距的探测;同一电极距相同条件下不同导电矿物含量的激发极化法探测。分析对比得出不同导电矿物含量与视电阻率、视极化率的定量关系,得出了二次场视极化率衰减规律与导电矿物含量为指数型函数关系。当达到超贫磁铁矿的可采边界品位时,指数函数系数a应大于2.31。
最后,在各种反演图件进行宏观定性分析基础上,利用数据优化得出视金属因素参数,并利用数据拟合得出超贫磁铁矿可采边界品位的控矿条件视金属因素应大于0.35(1/?·m)。结合其它参数建立了矿体判别模型。
With the quick development of the national economy, and the lack of the traditional iron resource,it is necessary to search and exploit the non-traditional iron resource. Hebei Province is rich in extremely low content magnetite. However, there is no data of searching and exploiting non-traditional iron resource and corresponding norm in China. How to find out and make full use of existing resources is an important subject.
Induced polarization method has been studied more mature in direct current method, but also is a effective geophysical exploration techniques for the exploration of multi-metallic mineral and water resources. It have variety of advantages ,such as many choices of installation, provided more physical parameters, reflecting the geoelectric information-rich, but have disadvantages, too. Such as the multiple solutions of interpretation, affected by multi-factors and so on. In order to meet the market demand for do more in-depth study of induced electrical in secondary field, so that it can make more data interpretation in line with the objective reality.
In this paper, using the induced polarization theory, studied the distribution of each parameter about secondary field under the conditions of different media, all-space, half-space by simulation test.
First, utilize soil box simulative test method to accomplish detecting with different electrode distances in the same condition, the same electrode distance under the same conditions from a different coating thickness by induced polarization method to detect. Quantitatively obtained the conversion relations of apparent resistivity and apparent polarizability in half-space to full space conditions.
Secondly, using indoor simulation test method under the same conditions to complete the detection of different electrode distance, the same electrode distance under the same conditions from a different conductive mineral content of the induced polarization method to detect. Analysis and comparison the quantitative relationship obtained with the apparent resistivity and apparent polarizability of different conductive mineral content. Discussed the exponential function relationship between attenuation of apparent polarizability in secondary field and conductivity of mineral content. Obtained that can be taken to achieve over clocking magnetite grade boundary, the exponential function coefficient should be larger than 2.31.
Finally, optimizing the use of data obtained apparent metallic modulus through the indoor data processing, conducted a qualitative analysis based on inversion maps. Fitting the data obtained after extremely low content magnetite grade boundary conditions for J greater than 0.35 (1/??m). Combined with other parameters establish a discriminant model of orebody.
引文
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[4]李世峰.矿山巷道电测深法模拟实验研究[J].矿业快报,2004, (3):20~21
[5]李金铭.地电场与电法勘探[M].北京:地质出版社,2005,216~217
[6]王世军.承德超贫磁铁矿的开发与评价[J].资源产业,2004,6(5):14~16
[7]李中念,张振芳,严国栋.河北省超贫磁铁矿资源与开发利用分析[J].河北冶金,2006, (3):1~4
[8]张赛珍.激发电位法研究结果[J].地球物理学报,1960, (1):24~28
[9]傅良魁.近场源激发极化法[M].北京:地质出版社,1986
[10]傅良魁.同点激电法[J].地质与勘探,1983, (9):52~57
[11]范宜仁,刘兵开.岩石激发极化电位的实验研究[J].测井技术,1997,21(4):241~246
[12]阮百尧,村上裕,徐世浙.激发极化数据的最小二乘二维反演方法[J].地球科学,1999,24(5):619~624
[13]杨进.激电找水资料处理解释软件系统及其应用[J].物探与化探,1999,23(5):363~367
[14]武炜,杨进.时域激电谱有限元数值模拟[J].物探与化探,2007,31(1):55~58
[15]童茂松,王荣,井连江.岩石激发极化弛豫时间谱实验影响因素分析[J].勘探地球物理进展,2006,29(1):25~29
[16]童茂松,李莉,王伟男.岩石激发极化弛豫时间谱与孔隙结构、渗透率的关系[J].地球物理学报,2005,48(3):710~716
[17]吴英隆,阮百尧,陈康,等.IP测深曲线一维快速反演在找矿预测中的应用[J].矿产与地质,1999,13(2):106~111
[18] Yang jin, Liu Zhaoping. Effectiveness of natural field induced polarization for detecting poly-metallic deposits[J]. Earth Science Frontiers ,2008 ,15(4): 217~221
[19] Seara,J.L., and A.Granda. Interpretation of IP time-domain resistivity sounding for delineating sea-water intrusions in some coastal areas of the northeast of Spain[J]. Geoexploration, 1987, (24): 153~161
[20] Oldenburg, D.W.DC. resistivity and IP methods in acid mine drainage problems: Results from the Copper Cliff mine tailings impoundments[J]. Applied Geophys,1996, (34): 187~198
[21] Slater, L.D., andD. Lesmes. IP interpretation in environmental investigations[J]. Geophysics,2002, (67): 77~68
[22] Ulrich, C and L.D. Slater. Induced polarization measurements on unsaturated, unconsolidated sands[J]. Geophysics,2004, (69): 762~771
[23] K.Titov, A. Kemna, A. Tarasov, and H. Vereecken. Induced Polarization of Unsaturated Sands Determined through Time Domain Measurements[J]. Vadose Zone Journal, 2004(3): 1160~1168
[24] Erika Gasperikova1, Nestor H. Cuevas and H. Frank Morrison. Natural field induced polarization for mapping of deep mineral deposits: A field example from Arizona[J]. Geophysics, 2005, 70 (6): B61~B66
[25] Tarasov, A and Titov, K. Relaxation time distribution from time domain induced polarization measurements[J]. Geophysical Journal International, 2007, (1): 31~43
[26] Mansoor, N and Slater, L. On the relationship between iron concentration and induced polarization in marsh soils[J]. Geophysics, 2007, (26): A1~A5
[27]陕西省第一物探队.激发极化法找水实验阶段总结(1969～1972)激发极化法文集[M].北京:地质出版社,1975
[28]吴天成.山区找水的“相对衰减时”法探讨[J].物探与化探.1987,11(6):435~442
[29]钟新淮.找水新法——激发极化法[M].北京:水利电力出版社,1987
[30]李金铭.激电找水的新参数——偏离度[J].勘察科学技术.1993,(6):25~56
[31]郝旭,李树文.综合物探方法在寻找磁铁矿中应用[J].河北煤炭建筑工程学院学报, 1995,(3):35~40
[32]李树文,郝旭,金瞰昆,等.激电异常的形态解释方法及其应用[J].地质与勘探, 2000,36(1):48~50
[33]李世峰.邯邢式铁矿及围岩电性特征和解释方法研究[J].金属矿山,2004, (增刊) :137~138
[34]李世峰,金瞰昆,周俊杰.资源与工程地球物理勘探[M].北京:化学工业出版社,2008,77~83
[35]雷宛,肖宏跃,邓一谦.工程与环境物探教程[M].北京:地质出版社,2006
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