摘要
插值切割法通常被用于分离磁异常的区域场和局部场。本文进一步将插值切割法用于研究火成岩体的分布，因为大多数火成岩具有较强的磁性。其方法是：首先选取一较大的切割半径，对经过化权并消除干扰处理的实测磁异常进行分离，划分出由火成者引起的局部磁异常；然后用从小到大的一系列切割半径对局部磁异常进行抵值切割处理，得到相应的一系列异常幅值；当异常幅值出现稳定极值时，所对应的切割半径与该局部磁异常对应的火成岩体的中心埋深相当。这一规律是对球状火成岩体而言的。至于其它形状火成岩体，经过特殊处理，也能得到类似的结果。
Interpolation-cut method is usually used to separate local field from areal fieIdof magnetic anomaly. The method can be also taken to ascertain distribution of ig-ne0us masses because most of igneous rocks have obvious magnetic characteristics.Here it needs the following steps:. With the use of a big cut radius, the local magnetic anomaly due to igneousmass is separated out from the real magnetic anomaly that has been reduced to thepole and underwent noise elimination processing... The local magnetic anomaly undergoes a series of interpolation-cut process-ings in different cut radius (starting from the minimum one) to produce a series ofcorresponding new local magnetic anomalies.. The homologous cut radius is equivalent to the center depth of the igne0usmass relating to the local magnetic an0maly when the magnetic anomaly goes thestable limit.The method is for globular igneous mass. Igneous masses in other shapes needan additional special processing.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1998年第1期125-131,共7页
Oil Geophysical Prospecting
关键词
磁异常场
插值切割法
火成岩体
磁法勘探
magnetic anomaly field, interpolation-cut method, local magnetic anomaly, cut radius, igneous mass, depth
