利用重磁对应分析法对负磁异常区内油页岩的推断

Estimation of Oil Shale in Negative Magnetic Anomaly Zone by Means of Gravity and Magnetic Correspondence Analysis

汉中地区的油页岩是陆相沉积的侏罗纪沉积岩,成分以石英砂岩、高岭土为主,具有油页岩普遍特征,相对密度中等,磁性弱,不适合重磁处理。但由于研究区的造山运动,被火成岩入侵,含有金属矿物带和褶皱带,油页岩层被其切割。因此,反其道而行,首先利用常规重磁处理手段,剔除金属矿脉和褶皱,圈出负磁异常区;其次,改造重力对应分析法,提出新相关系数R',把负磁异常区内的符合要求的R'断定为油页岩存在的区域。为油页岩的探测提供了一种新的探测方法。

The Hanzhong area of oil shale is Jurassic sedimentary rocks of continental deposit, mainly quartz sandstone, kaolin component, with common features of oil shale, relative density moderate, weak magnetism, not suitable for gravity and magnetic. But as a result of the orogeny, igneous intrusion, containing metal mineral zone and fold belt, the oil shale is the cutting. Therefore, thinking conversely, firstly, we can use the conventional gravity and magnetic method to remove metal veins and folds, as well to demarcate the negative magnetic anomaly area. secondly, corresponding to the transformation of the gravity analysis method, a new correlation coefficient is proposed, And the matching R' in the negative magnetic anomaly region is determined as the area where the oil shale is present. A new detection method is provided for the exploration of oil shale.