航空磁测△T异常特征分析及应用
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摘要
磁法勘探中研究的磁异常场,大都属于地壳中局部的磁异常,即磁性地质体的磁场。这种磁性地质体的磁场在地表上空间分布的形态特征,直接受局部磁性地质体形状、大小、产状和磁化强度等因素的控制。因此,为了了解地下岩层、岩体分布特征、构造特征和矿产分布的特征,我们是根据测得的磁异常分布特征进行分析,做出判断的。
由于多数教科书及参考文献上对航空磁测△T的平面及空间特征分析较少,使得在对航空磁测以及现在地面磁测资料解释推断时缺乏参考,本文通过自主编程计算出各种规则磁性体的△T异常,从理论上讨论了各种规则磁性体△T异常的剖面、平面、断面特征。
本文首先讨论了各种规则磁性体的△T异常,得出单个磁性体△T异常的平面等值线形状大体可分为三种,即长带状、等轴状和椭圆状;主剖面曲线有三种基本形态:两侧无负异常的△T曲线、一侧有负异常的△T曲线和两侧都有负异常的△T曲线。然后,对△T、Z a异常进行了比较,得出△T与Z a异常在平面、剖面、断面上的曲线形态都是类似的,不同之处:在主剖面上,有△T极小值的绝对值大于Z a极小值的绝对值;△T平面等值线的零值线是一条曲线,将异常分为正负两部分,而Z a的零值线是圈闭的,包围着正异常,△T的负值范围小于Z a。最后,将所研究的结果应用到尼雄地区的反演计算中,得出了与钻探剖面相符的结果。
理论模型的计算及实际资料的应用结果表明,本文所做的研究,对以后航空磁测及地面磁测资料的解释推断具有一定的指导意义。
The magnetic anomaly field studied in magnetic prospecting, mostly pertain to the local magnetic anomalies in the crust, namely the magnetic field of magnetic geologic body. The morphological character of space distribution on shallow ground of these magnetic geologic body are controlled directly by factors of shape, size, formation state, magnetic intensity of local magnetic geologic body and so on. Therefore, in order to understand the character of the underground terrane and rockmass of distribution, conformation and mineral distributing ,we can analyse and estimate the character of the magnetic anomaly we surveyed.
Since the majority of textbooks and reference literatures about the analysis of△T character in plane and space of aeromagnetic survey are less, the aeromagnetic and ground magnetic data is lack of reference in interpretation and inference. In this paper, we through self-programing to calculate the△T anomaly of variety rules magnetic body , theoretically discussed the profiles, plane, the cross section features of△T anomaly of variety rules magnetic body.
In this paper, firstly, we discussed△T anomaly of various rules magnetic body , and concluded that the contour shape of a single magnetic△T anomalies can be roughly divided into three types: long strip, equiaxed and elliptical; Main profile curve has three basic forms: both sides of the△T curve with no negative anomalies , one side of the△T curve with negative abnormal, and negative anomaly on both sides of the△T curve.
In addition, comparing△T and Z a anomaly, we obtained that the curve shape of△T and Z a anomaly in the plane, profile, cross section is similar, the difference between them is in the main profile the absolute value of a minimum value of△T anomaly is greater than that of Z a anomaly .And the zero value contour line of △T anomaly is a curve, dividing the anomaly into two parts of positive and negative, while the one of Z a anomaly is closed, surround the positive anomalies, the negative range of△T anomaly is less than Z a anomaly .
Lastly, the results of the study were applied to the inversion calculation of NiXiong region , and the results are consistent with the drilling profiles.
Theoretical models together with actual data applications show that the research has been done in this paper with some guidance for the interpretation and inference of the aeromagnetic and ground magnetic survey data .
由于多数教科书及参考文献上对航空磁测△T的平面及空间特征分析较少,使得在对航空磁测以及现在地面磁测资料解释推断时缺乏参考,本文通过自主编程计算出各种规则磁性体的△T异常,从理论上讨论了各种规则磁性体△T异常的剖面、平面、断面特征。
本文首先讨论了各种规则磁性体的△T异常,得出单个磁性体△T异常的平面等值线形状大体可分为三种,即长带状、等轴状和椭圆状;主剖面曲线有三种基本形态:两侧无负异常的△T曲线、一侧有负异常的△T曲线和两侧都有负异常的△T曲线。然后,对△T、Z a异常进行了比较,得出△T与Z a异常在平面、剖面、断面上的曲线形态都是类似的,不同之处:在主剖面上,有△T极小值的绝对值大于Z a极小值的绝对值;△T平面等值线的零值线是一条曲线,将异常分为正负两部分,而Z a的零值线是圈闭的,包围着正异常,△T的负值范围小于Z a。最后,将所研究的结果应用到尼雄地区的反演计算中,得出了与钻探剖面相符的结果。
理论模型的计算及实际资料的应用结果表明,本文所做的研究,对以后航空磁测及地面磁测资料的解释推断具有一定的指导意义。
The magnetic anomaly field studied in magnetic prospecting, mostly pertain to the local magnetic anomalies in the crust, namely the magnetic field of magnetic geologic body. The morphological character of space distribution on shallow ground of these magnetic geologic body are controlled directly by factors of shape, size, formation state, magnetic intensity of local magnetic geologic body and so on. Therefore, in order to understand the character of the underground terrane and rockmass of distribution, conformation and mineral distributing ,we can analyse and estimate the character of the magnetic anomaly we surveyed.
Since the majority of textbooks and reference literatures about the analysis of△T character in plane and space of aeromagnetic survey are less, the aeromagnetic and ground magnetic data is lack of reference in interpretation and inference. In this paper, we through self-programing to calculate the△T anomaly of variety rules magnetic body , theoretically discussed the profiles, plane, the cross section features of△T anomaly of variety rules magnetic body.
In this paper, firstly, we discussed△T anomaly of various rules magnetic body , and concluded that the contour shape of a single magnetic△T anomalies can be roughly divided into three types: long strip, equiaxed and elliptical; Main profile curve has three basic forms: both sides of the△T curve with no negative anomalies , one side of the△T curve with negative abnormal, and negative anomaly on both sides of the△T curve.
In addition, comparing△T and Z a anomaly, we obtained that the curve shape of△T and Z a anomaly in the plane, profile, cross section is similar, the difference between them is in the main profile the absolute value of a minimum value of△T anomaly is greater than that of Z a anomaly .And the zero value contour line of △T anomaly is a curve, dividing the anomaly into two parts of positive and negative, while the one of Z a anomaly is closed, surround the positive anomalies, the negative range of△T anomaly is less than Z a anomaly .
Lastly, the results of the study were applied to the inversion calculation of NiXiong region , and the results are consistent with the drilling profiles.
Theoretical models together with actual data applications show that the research has been done in this paper with some guidance for the interpretation and inference of the aeromagnetic and ground magnetic survey data .
引文
[1]谭成泽,郭绍雍.磁法勘探教程[M].地质出版社,1984.
[2]管志宁.地磁场与磁力勘探[M].地质出版社,2005.
[3]成都地质学院.应用地球物理学-磁法教程[M] .北京:地质出版社,1980.
[4]申宁华,管志宁.磁法勘探问题[M].地质出版社,1985.
[5]夏国治,许宝文,陈云升,孙文珂,曾繁超.二十世纪中国物探[M] .地质出版社2004.
[6]王邦华等.均匀磁化多面体的磁场[J].地球物理学报,1980第4期.
[7]秦葆瑚,张昌达,朱文孝,阎桂林.高精度磁法勘探[M] .长沙:中南工业大学出版社,1987.
[8]董焕成.重磁勘探教程[M] .北京:地质出版社.
[9]熊光楚.金属矿区磁异常的解释推断[M] .地质出版社,1981.
[10]管志宁,张昌达,程方道,申宁华.磁法勘探重要问题理论分析与应用[M] .北京:地质出版社,1993.
[11]熊盛青.航空物探“九五”进展综述[J] .物探与化探,2002.
[12]熊盛青.我国航空物探现状与展望[J] .中国地质,1999.
[13]申宁华.磁法勘探的科技进展[J] .物探与化探,1989.
[14]熊盛青,于长春,王卫平,范正国.直升机大比例尺航空物探在深部找矿中的应用前景[J] .地球科学进展,2008.
[15]张洪瑞,范正国.2000年来西方国家航空物探技术的若干进展[J] .物探与化探,2007.
[16]管志宁,姚长利.21世纪重力与磁法勘探的展望[J],地球物理学进展.2002.
[17]施兴,彭朝晖.河北省航磁资料的研究程度与找矿潜力分析[J] .物探与化探,2009.
[18]刘天佑.磁测资料处理新方法及在危机矿山挖潜中的应用[J] .物探与化探,2006.
[19]于长春,范正国,王乃东,等.高分辨率航磁方法及其在大冶铁矿区的应用[J].地球物理学进展,2007,22(3): 979.
[20]李才明,磁法勘探教程[M] .成都理工大学,2005.
[21]熊盛青,周伏洪,姚正熙,等.青藏高原中西部航磁调查[M] .中国国土资源航空物探航遥中心,北京:地质出版社,2001.
[22]胡为正,黄孝文,蒋金明.西藏措勤县木质顶磁铁矿矿床地质特征及成因分析[J] .资源调查与环境,2006, Vol.27,No.3:200-208.
[23]方迎尧.航空物探的发展与展望.航空物探技术[J].1990,2期,1-8.
[24]钟云川,蒋丛林.潞西地区航磁异常特征及找矿新思路[J] .云南地质, 2009, 28(2): 185-190.
[25]张季生,洪大卫,王涛.由航磁异常判断准葛尔盆地基底性质[J].地球学报,2004, 25(4):473.
[26]熊光楚.金属矿区磁法勘探的进展与展望[J] .地球物理学报,1994,37(1): 437-443.
[27]郭良德.澳大利亚航空物探[J].中国地质,2000,27(7):16.
[28]郭良德,西方国家航空物探技术的若干进展[J].物探与化探,2000,24(5):341.
[29]宁书年,王四龙,许孝庭.煤矿区岩浆岩体磁法探测[J].徐州:中国矿业大学出版社,1993.
[30]刘玉荣,王四龙,宁书年.淮北煤田航磁异常的地质解释[J].中国煤田地质, 1997, 9(1) .
[31]梁德超,郑广如,侯连第.高精度航磁资料在桂滇黔地区金矿普查中的应用效果[J].物探与化探, 1995, 19(2): 128-134.
[32]李盛汗.安徽铜陵、贵池地区的环状航磁异常及其找矿意义[J].有色金属矿产与勘查, 1995, 228-232.
[33] Peng Yuanyuan, Li Shichao, Lu Laijun,Liu Guangsheng,Wu Jun. Study on deep structure in Ailaoshan region based on aeromagnetic interpretations [J].Global Geology, 2009, 12(4):189-193.
[34] Xu Shizhe, Wang Rui, Zhou Jianxin, Xiao Pengfei, Chen Shengchang. Downward continuation of aeromagnetic data to the marine surface[J]. Acta Oceanologica Sinica,2008, 27(1),54-60.
[35] Liu Qingsheng, Liu Qingsong, Zhang Zeming, Yang Tao , Fu Yuanyuan.Serpentinized Peridotite as Source of Aeromagnetic Anomalies [J]. Journal of China Univercity of Geosciences, 2004, 15(4): 416-419.
[36] Gou liang, Zeng Qingquan, Liu Dongqing,Yang Gaoyin. The Role of Gravity, Magnetic and Electric Prospecting Techniques in the Geological Survey of the Qiangtang Basin[J]. CGS BULLETIN, 2003, 6(1): 92-96.
[37]张永军,刘振军,周坚鑫.珠江口盆地航磁局部构造异常[J].物探与化探, 2010, 34(1), 8-13.
[38]王德发,刘英才,熊盛青,薛典军等.西藏铬铁矿接替资源航磁勘查及找矿方向探讨[J].地质通报, 2007,26(4):476-482.
[39] Jiang Fan, Wu Jiansheng, Wang Jialin. Joint inversion of gravity and magnetic data for a two-layer model[J]. Applied Geophysics, 2008, 5(4):3314-339.
[40] Sun Bin, Dong Ping, Wang Chong, Pu Xiaoxuan, Wu Yongjing.Quantitative analysis of magnetic anomaly of reinforcements in bored in-situ concrete piles[J].Applied Geophysics,2009,6(3):275-286.
[41]黄国祥,余惠祥,蔡文成.应用地球物理-磁法勘探[M].中南工业大学出版社,1988.
[42]罗孝宽,郭邵雍.应用地球物理-重力磁法[M].地质出版社,1991.
[2]管志宁.地磁场与磁力勘探[M].地质出版社,2005.
[3]成都地质学院.应用地球物理学-磁法教程[M] .北京:地质出版社,1980.
[4]申宁华,管志宁.磁法勘探问题[M].地质出版社,1985.
[5]夏国治,许宝文,陈云升,孙文珂,曾繁超.二十世纪中国物探[M] .地质出版社2004.
[6]王邦华等.均匀磁化多面体的磁场[J].地球物理学报,1980第4期.
[7]秦葆瑚,张昌达,朱文孝,阎桂林.高精度磁法勘探[M] .长沙:中南工业大学出版社,1987.
[8]董焕成.重磁勘探教程[M] .北京:地质出版社.
[9]熊光楚.金属矿区磁异常的解释推断[M] .地质出版社,1981.
[10]管志宁,张昌达,程方道,申宁华.磁法勘探重要问题理论分析与应用[M] .北京:地质出版社,1993.
[11]熊盛青.航空物探“九五”进展综述[J] .物探与化探,2002.
[12]熊盛青.我国航空物探现状与展望[J] .中国地质,1999.
[13]申宁华.磁法勘探的科技进展[J] .物探与化探,1989.
[14]熊盛青,于长春,王卫平,范正国.直升机大比例尺航空物探在深部找矿中的应用前景[J] .地球科学进展,2008.
[15]张洪瑞,范正国.2000年来西方国家航空物探技术的若干进展[J] .物探与化探,2007.
[16]管志宁,姚长利.21世纪重力与磁法勘探的展望[J],地球物理学进展.2002.
[17]施兴,彭朝晖.河北省航磁资料的研究程度与找矿潜力分析[J] .物探与化探,2009.
[18]刘天佑.磁测资料处理新方法及在危机矿山挖潜中的应用[J] .物探与化探,2006.
[19]于长春,范正国,王乃东,等.高分辨率航磁方法及其在大冶铁矿区的应用[J].地球物理学进展,2007,22(3): 979.
[20]李才明,磁法勘探教程[M] .成都理工大学,2005.
[21]熊盛青,周伏洪,姚正熙,等.青藏高原中西部航磁调查[M] .中国国土资源航空物探航遥中心,北京:地质出版社,2001.
[22]胡为正,黄孝文,蒋金明.西藏措勤县木质顶磁铁矿矿床地质特征及成因分析[J] .资源调查与环境,2006, Vol.27,No.3:200-208.
[23]方迎尧.航空物探的发展与展望.航空物探技术[J].1990,2期,1-8.
[24]钟云川,蒋丛林.潞西地区航磁异常特征及找矿新思路[J] .云南地质, 2009, 28(2): 185-190.
[25]张季生,洪大卫,王涛.由航磁异常判断准葛尔盆地基底性质[J].地球学报,2004, 25(4):473.
[26]熊光楚.金属矿区磁法勘探的进展与展望[J] .地球物理学报,1994,37(1): 437-443.
[27]郭良德.澳大利亚航空物探[J].中国地质,2000,27(7):16.
[28]郭良德,西方国家航空物探技术的若干进展[J].物探与化探,2000,24(5):341.
[29]宁书年,王四龙,许孝庭.煤矿区岩浆岩体磁法探测[J].徐州:中国矿业大学出版社,1993.
[30]刘玉荣,王四龙,宁书年.淮北煤田航磁异常的地质解释[J].中国煤田地质, 1997, 9(1) .
[31]梁德超,郑广如,侯连第.高精度航磁资料在桂滇黔地区金矿普查中的应用效果[J].物探与化探, 1995, 19(2): 128-134.
[32]李盛汗.安徽铜陵、贵池地区的环状航磁异常及其找矿意义[J].有色金属矿产与勘查, 1995, 228-232.
[33] Peng Yuanyuan, Li Shichao, Lu Laijun,Liu Guangsheng,Wu Jun. Study on deep structure in Ailaoshan region based on aeromagnetic interpretations [J].Global Geology, 2009, 12(4):189-193.
[34] Xu Shizhe, Wang Rui, Zhou Jianxin, Xiao Pengfei, Chen Shengchang. Downward continuation of aeromagnetic data to the marine surface[J]. Acta Oceanologica Sinica,2008, 27(1),54-60.
[35] Liu Qingsheng, Liu Qingsong, Zhang Zeming, Yang Tao , Fu Yuanyuan.Serpentinized Peridotite as Source of Aeromagnetic Anomalies [J]. Journal of China Univercity of Geosciences, 2004, 15(4): 416-419.
[36] Gou liang, Zeng Qingquan, Liu Dongqing,Yang Gaoyin. The Role of Gravity, Magnetic and Electric Prospecting Techniques in the Geological Survey of the Qiangtang Basin[J]. CGS BULLETIN, 2003, 6(1): 92-96.
[37]张永军,刘振军,周坚鑫.珠江口盆地航磁局部构造异常[J].物探与化探, 2010, 34(1), 8-13.
[38]王德发,刘英才,熊盛青,薛典军等.西藏铬铁矿接替资源航磁勘查及找矿方向探讨[J].地质通报, 2007,26(4):476-482.
[39] Jiang Fan, Wu Jiansheng, Wang Jialin. Joint inversion of gravity and magnetic data for a two-layer model[J]. Applied Geophysics, 2008, 5(4):3314-339.
[40] Sun Bin, Dong Ping, Wang Chong, Pu Xiaoxuan, Wu Yongjing.Quantitative analysis of magnetic anomaly of reinforcements in bored in-situ concrete piles[J].Applied Geophysics,2009,6(3):275-286.
[41]黄国祥,余惠祥,蔡文成.应用地球物理-磁法勘探[M].中南工业大学出版社,1988.
[42]罗孝宽,郭邵雍.应用地球物理-重力磁法[M].地质出版社,1991.