磁异常数据创新性处理发现棋盘状构造格局

CREATIVE PROCESSING OF MAGNETIC DATA FOR CHESS-BOARD STRUCTURE

针对近两年笔者为客户开展的磁测资料解释研究工作成果,总结利用磁测数据研究和划分棋盘状构造格局,为以后相关工作总结经验.通过此次研究性工作,笔者认识到:很多数据在做初步解释以后,还可能有隐伏的、微弱的信息有待于提取.不能一劳永逸,更不能满足现状.一些创新性数据处理工作是必要的.前人没有发现更多的信息,很重要的原因就是没有应用创新性数据处理,因为没有认识到,或者不掌握新的处理方法.在新认识提出以后,还可以返回去使用常规数握处理手段,利用新思路总结和发现新信息、新认识.磁异常解释不仅对于规模大、异常强的构造有所反应,对微弱的、交叉、凌乱的小规模棋盘状构造格局也会有很好的识别和指示.这些棋盘状构造格局控制了M2区内岩脉的产出,从而形成了岩脉交叉、凌乱,局部走向难以确定的问题.地质上观测的结果大部分与磁测推断的结果相吻合.但是,由于研究区的覆盖原因,地质观察不够直接.同时,研究区不少中等磁性岩性目前还没有,或者不能利用磁测手法加以区分.因此个别地质认识与磁测解释推断发生冲突是正常的,也是必然的.

Based on the study of interpretation for magnetic survey data in recent two years, the authors discuss the application of magnetic data for the recognition of chess-board structures. The study shows that, after the preliminary interpretation of data, there might be some hidden weak information remained for further extraction. Thus creative processing for the data is necessary. Magnetic anomaly can respond not only large and strongly anomalous structures, but also weak, crossed and mixed small chess-board structure. In the study area, the chess-board structure controls the occurrence of dikes. Because of the coverage, the strikes of the dikes are difficult to decide by direct geological observation.This problem is solved by the magnetic inference.