MORPAS系统证据权法在中大比例尺成矿预测中的应用  

THE APPLICATION OF WEIGHTS OF EVIDENCE IN MORPAS SYSTEM TO MEDIUM-LARGE SCALE METALLOGENIC PRODICTION

作　　者：陈冲[1] 谭俊[1] 石文杰[1] 李相坤[2] 段显超[2] 高翔[1] 翟亚锋[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074 [2]吉林油田公司乾安采油厂,吉林乾安131400

出　　处：《物探与化探》2012年第5期827-833,共7页Geophysical and Geochemical Exploration

基　　金：内蒙古自治区国土资源厅项目"内蒙古额济纳旗基东等四幅1:5万区域矿产地质调查"(NMKD2008-32)

摘　　要：证据权法在大范围中小比例尺成矿预测中的应用效果良好,但对于工作程度较低的小范围中大比例尺预测工作则鲜有涉及。以阿拉善某一研究程度较低的小范围中大比例尺地区为研究对象,在地质调查的基础上,结合该区空间位置统计分析结果,选择了符合条件的证据图层,按80 m×40 m北东向网格单元将各证据图层属性进行链接,基于MORPAS系统中的证据权模型,定量分析了各证据层与Cu高值点分布的相关性,并通过图形方式直观表达了找矿有利地段的空间分布特征。经过验证,研究区两条探槽都见到了矿体,说明该方法在研究程度较低的小范围中大比例尺成矿预测中具有可行性。The application effect of weight of evidence modeling in small-medium scale metallogenic prediction is fairly good, but re- searches on weight of evidence modeling of medium-large scale metallogenic prediction in small low working level areas are very insuffi- cient. In this paper, the authors selected a certain medium-large scale work area and a small low working level area in Alxa region. According to geological features in combination with spatial position analysis, appropriate evidence factors were selected. By linking each evidence factor with NE grid size of 80 m ~ 40 m, the authors analyzed and calculated spatial relationship between the evidence and Cu high points on the basis of weight of evidence modeling in MORPAS system. Spatial distribution of favorable ore-prospecting ar- eas is expressed intuitively through graphics. Two trenchs intersect the ore body, suggesting that the model is also suitable for the medi- um-large scale and small low working level area metallogenic prediction.

关 键 词：MORPAS证据权法 中大比例尺 成矿预测 阿拉善地区 

分 类 号：P632[天文地球—地质矿产勘探]