CAJ | 학술논문

勘测深部盲矿体时，矿体距离观测点较远，磁异常的相互叠加常常在地面形成具有一个磁异常中心的宽缓磁异常，分辨不清矿致异常和背景异常。通常用向上延拓、方向导数等处理的效果差强人意。笔者采用向下延拓方法处理了青海某矿区的宽缓磁异常，向下延拓深度为30倍点距，获得了精细的各矿体异常特征。通过与大量的见矿、未见矿钻孔比较，向下延拓场反映的磁异常位置与已见矿钻孔有较好的对应关系，同时指示出全部的未见矿钻孔都处于向下延拓场反映的磁异常外围。基于当前向下延拓方法的稳定计算问题已经取得突破，笔者认为针对一些大埋藏深度的宽缓磁异常采用向下延拓处理，区分叠加异常，圈定异常位置，可以获得事半功倍的效果，为钻孔布置提供佐证。同时对勘探精度也作了一些有意义的讨论。
감측심부맹광체시，광체거리관측점교원，자이상적상호첩가상상재지면형성구유일개자이상중심적관완자이상，분변불청광치이상화배경이상。통상용향상연탁、방향도수등처리적효과차강인의。필자채용향하연탁방법처리료청해모광구적관완자이상，향하연탁심도위30배점거，획득료정세적각광체이상특정。통과여대량적견광、미견광찬공비교，향하연탁장반영적자이상위치여이견광찬공유교호적대응관계，동시지시출전부적미견광찬공도처우향하연탁장반영적자이상외위。기우당전향하연탁방법적은정계산문제이경취득돌파，필자인위침대일사대매장심도적관완자이상채용향하연탁처리，구분첩가이상，권정이상위치，가이획득사반공배적효과，위찬공포치제공좌증。동시대감탐정도야작료일사유의의적토론。
In the exploration of deep concealed orebodies, the large distance between the iron orebody and the observation surface may produce only one broad magnetic anomaly which can't distinguish ore?related anomalies and background?induced anomalies. The appli?cation of upward continuation and derivatives fails to obtain satisfactory results. During the case study in Qinghai Province using down?ward continuation, the authors obtained the fine anomalies based on the downward continued field with a distance of 30 times that of the grid interval. The comparison of the downward continued field with many magnetite?bearing and non?magnetite?bearing drill holes re?vealed a clearer relationship between the magnetic anomalies and the ore?intersecting drill holes. It is also shown that all of the non?magnetite?bearing drill holes are located outside the downward continued field. Since it is possible to apply the stable downward continu?ation at present, the authors hold that the downward continuation of the anomaly with a large buried depth is useful in distinguishing su?perimposed anomalies and detecting the anomaly's location, thus providing evidence for planning the mining operations. The exploration accuracy is also discussed in this paper.