地学前缘 ›› 2022, Vol. 29 ›› Issue (4): 403-411.DOI: 10.13745/j.esf.sf.2022.2.66

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深度挖掘数据潜在价值提高找矿靶区定量优选精度

冯军(), 张琪, 罗建民   

  1. 甘肃省地质调查院, 甘肃 兰州 730000
  • 收稿日期:2022-03-15 修回日期:2022-04-01 出版日期:2022-07-25 发布日期:2022-07-28
  • 作者简介:冯 军(1963—),男,高级工程师,主要从事地质矿产调查与方法研究工作。E-mail: 429031727@qq.com
  • 基金资助:
    甘肃省西秦岭地区综合信息成矿预测研究项目(甘地发[2014]158号)

Deeply mining the intrinsic value of geodata to improve the accuracy of predicting by quantitatively optimizing method for prospecting target areas

FENG Jun(), ZHANG Qi, LUO Jianmin   

  1. Geological Survey of Gansu Province, Lanzhou 730000, China
  • Received:2022-03-15 Revised:2022-04-01 Online:2022-07-25 Published:2022-07-28

摘要:

找矿效果取决于找矿靶区预测的准确程度,传统的“综合信息成矿预测”(定性研究)已无法深入挖掘现有地质信息的潜在价值。本文应用大数据思想、方法,对甘肃省祁连山—龙首山地区1∶20万区域化探数据做分幅平差,消除了原始数据的系统误差。应用回归分析建立信息修复模型,增强了化探信息与区域Cu矿的相关关系。通过判别分析算法,构建了区域“化探信息Cu找矿靶区定量优选系列模型”,对研究区Cu找矿靶区做出定量预测。经统计,一、二级预测靶区中包含已知铜矿的比率高于22.0%,其面积仅占总研究区的1.72%。大数据找矿靶区定量预测在大幅提高预测精度的同时,很大程度地缩小了预测找矿靶区的面积。在对系列模型预测效果做出定量评价的同时,通过所建系列模型组合元素的特征分析,该研究也为进一步研究区域矿床成因和控矿条件提供了定量依据。

关键词: 化探, 数据挖掘, 系列模型, 找矿靶区, 定量预测

Abstract:

Ore prospecting relies on accurate target prediction. The traditional information-based qualitative metallogenic prognostic method, however, has not been able to perform geodata deep mining. In this paper, Big Data deep mining methodology and leveling technique were applied to 1∶200000 scale stream sediment geochemical survey data collected from the Qilian and Longshou Mountains region, Gansu Province to eliminate systematic errors in the raw data. Through regression analysis an information repair model was established to improve the correlation between survey results and copper ore deposits. Using discriminant analysis algorithm, a series of quantitatively optimized prediction models for copper ore prospecting were developed. These prediction models quantitatively predicted copper prospecting target areas. According to the statistical analysis, the proportion of known copper ore deposits exceeded 22% of the class 1 or class 2 predicted target areas, while the target areas only covered 1.72% of the total studied area. Thus, quantitative prediction of prospecting target area using Big Data has greatly increased prediction accuracy while markedly reduced prediction acreage. By characteristic analysis of model elements, the predictive power of the prediction model series was quantitatively evaluated, which provided a basis for the quantitative evaluation of ore genesis and regional ore control conditions.

Key words: geochemical survey, data mining, series of models, prospecting target areas, quantitative predicting

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