MODULUSINVERSIONOFTHREE-COMPONENTBOREHOLEMAGNETICDATA
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摘要: 井中三分量磁测解释通常要考虑磁性体的磁化方向,但是在剩磁或退磁影响过大的情况下,磁化方向难以确定。由于磁异常模量具有不依赖或弱依赖磁性体磁化方向的特点,而且利用井中三分量数据可以直接计算模量值,因此,笔者尝试利用井中三分量磁测的模量进行磁性体反演。首先利用井中三分量磁测数据计算模量值,然后利用模量反演二度板状体和直立长方体模型的磁性参数和几何参数,并将该方法应用于新疆某铁矿区井中磁测资料的反演解释中。结果表明,该方法不受或弱受磁法方向影响,在无法准确确定磁化方向的情况下能较准确地判断异常体的位置;优于传统的单分量Za反演方法;现场应用效果良好。Abstract: Itisusuallynecessarytoconsiderthemagnetizationdirectionofthemagneticbodyintheinterpretationofthree-component boreholemagneticdata;however,itisratherdifficulttodeterminethemagnetizationdirectionunderthestrongeffectofremnantmag-netizationordemagnetization.Themodulusofmagneticanomalyisnotdependentorinsignificantlydependentonthemagnetizationdi-rection,andmoduluscanbecalculateddirectlybyusingthree-componentboreholemagneticdata.Theauthorshencetriedtoinverse themodelparameterswiththemodulusofthree-componentboreholemagneticdata.First,thevalueofthemoduluswascalculatedbyu-singthree-componentboreholemagneticdata.Then,thegeometricalandmagneticparametersof2Dtabularbodyandverticalcube wereinversedwiththemodulusdata.Finally,thismethodwasappliedtotheboreholemagneticdataofanironoremineinXinjiang. Theresultsshowthatthemodulusinversionresultislessinfluencedbymagnetizationdirectionwhenmagnetizationdirectionisunknown orinaccurate;themodulusinversionissuperiortothetraditionalinversionusingsingle-componentZaandreceivesgoodgeologicalre-sults.
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Key words:
- boreholemagneticdata /
- three-component /
- magneticanomalymodulus /
- optimizedinversion
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