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重力勘探是普查找铁矿的重要手段之一,其物理基础是岩石和矿石的密度差.岩石和矿石的磁性差异可以达到几个数量级,而密度差的变化范围却很窄.所以,在重力勘探工作中,技术要求严格,对测点的高差、地形、测量仪器的零点漂移以及地理纬度都必须作相应的改正.对某些干扰场,如区域重力场、基岩起伏等,由于它们对矿体的重力影响很大.在解释重力测量结果之前,也必须进行改正,以便消除这些影响,突出矿体的异常.本文简要地介绍我们在这方面所取得的经验,供从事重力法找铁矿工作的同志们参考.
Gravity exploration is one of the most important means of general prospecting for iron ore, and its physical basis is the density difference between rock and ore. The magnetic difference between rock and ore can reach several orders of magnitude while the density difference varies very narrowly. Therefore, In the exploration work, the technical requirements are strict, and the elevation difference of the measuring point, the topography, the zero drift of the measuring instrument and the latitude of the geography must be corrected accordingly.For some interference fields, such as the regional gravitational field, bedrock fluctuation, etc., Have a great influence on the gravity of the ore body and must be corrected before explaining the results of gravimetry in order to eliminate these effects and highlight the abnormalities in the ore body.This article briefly introduces our experience in this area for gravitation Comrades working for iron ore reference.