基于地面及井中磁测数据反演计算找矿应用——以冀东大石河铁矿区为例

Application of inversion calculation of ground and well magnetic data to Fe ore prospecting:A case study of Dashihe Iron mining area in east Hebei Province

冀东铁矿区是我国典型的鞍山式沉积变质型铁矿,在数量及规模上均处于国内前列,大石河铁矿位于该区内。自20世纪60、70年代地质找矿会战开始,冀东铁矿区浅部矿体开采殆尽,如何利用“就矿找矿”的原则进一步挖掘深部资源迫在眉睫。运用先进的地质理论和物探技术方法寻找隐伏矿体是解决此类问题的方法之一。随着勘探深度不断的增加,浅部信息已经相对较弱,加上浅部矿体的影响,深部隐伏矿体难以发掘。利用好地面及井中磁异常信息,能够有效地对深部矿体进行勘查。本文通过实例说明在深部矿体勘查中,应用地面及井中磁测数据联合反演,弥补深部矿体磁异常弱的问题,为深部资源勘查提供有效手段。

The east Hebei province is a main Anshan type sedimentary metamorphic Fe ore producer with numerous Fe ore deposits and large reserves in China.Dashihe Fe deposit is located in this area.In the 1960s and 1970s,the geological prospecting battle were carried out here.Since then the Fe ore has been mined and the shallow ore exhausted.Now it is urgent to locate ore bodies to depth of Dashihe Fe mine.Using advanced geological theory and geophysical technology to find hidden ore body is one of the solutions.With the continuous increase of exploration depth,shallow information has been relatively weak.Deep hidden ore body is difficult to prospect due to the influence of shallow ore body.The ground and well magnetic anomaly information should help effectively explore the deep ore body.Ground and well magnetic data would make up for the unusually weak magnetic signal of the deep ore body and provide an effective means for the deep resource exploration.