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地球化学元素的背景值一般服从正态分布或对数正态分布,假定服从正态分布,用图方法可以求出它的数学期望值(μ)和标准差(σ),进而可以求出每个观测数据的背景值。观测数据由背景值和剩余异常值组成,剩余异常值等于观测数据减去背景值。定义异常为剩余异常值在背景值上发生的小概率事件,即剩余异常值≥μ+3σ,称为剩余异常法。以西藏班戈-嘉黎地区铀矿远景调查项目的化探数据为例,通过与传统方法圈出的异常进行对比显示,剩余异常法可以有效地降低异常数量和剔除假异常,减少不必要的异常查证,节约经费,提高找矿效率。
The background values of geochemical elements are generally normal distribution or lognormal distribution. Assuming normal distribution, the mathematical expectation value (μ) and standard deviation (σ) can be calculated by the graph method, and then each The background value of the observed data. The observed data consists of the background value and the remaining anomalies, and the remaining anomaly is equal to the observed data minus the background value. The definition of anomalies for the remaining anomalous values in the background value of the small probability event occurs, the remaining anomaly value ≥ μ + 3σ, known as the residual anomaly. Taking the geochemical data of the uranium prospect project in the Bangor-Jiali area of Tibet as an example, by contrasting with the anomalies circled by the traditional methods, the residual anomaly method can effectively reduce the anomalous quantity and eliminate false anomalies, and reduce unnecessary Abnormal verification, save money, improve ore prospecting efficiency.