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| 用测井方法原位测定矿层品位 | |
| 引用本文： | 曾繁超,徐凤曾,郑建屏.用测井方法原位测定矿层品位[J].物探与化探,1994,18(5):339-352. |
| 作者姓名： | 曾繁超 徐凤曾 郑建屏 |
| 作者单位： | 地矿部勘查技术司，山东省地矿局物探队，四川省地矿局２０７队 |
| 摘 要： | 在取心困难的矿种上,利用测井方法原位测定矿层品位是一个值得开拓的领域。我国现用的测井求品位的方法技术,大体可分为两类,即核测井技术和回归分析处理技术,前者用中子活化测井原位测定萤石矿的品位,后者用天然伽玛测井求钙芒硝矿和含铀磷矿的品位,均取得了成功,并总结出一套工作方法。用测井方法求矿层品位优于用钻探取心、目视采样、然后化学分析的常规做法,原因是测井可连续测量,获得矿层信息完整,且横向探测半径又远比岩心大,故代表性强,且不存在化验分析所遇到的钻探采取率不足,以及取样的随机因素干扰,所以它提供的地下矿层品位的数据更接近真实。通过三个矿区的实例,说明测并可在现场即时提供品位数据,有利于指导地质人员取样和进一步的施工部署,在钻探采取率不高或打丢矿层时,借助测井资料可以不再采取其他工程补救措施,节约了时间和费用。本文还指出了要求测井品位和矿心分析品位完全一致的不合理性,阐明这是两种不同的独立分析方法,两者测量的样品不同,取样的方式不同,所以衡量两者提供品位数据的可信度,不仅取决于两者各自的测量精度,也取决于两者各自具有的地下矿层实际品位(即真值)的代表性,而在代表性方面,测井品位数据优于矿心分析数据,因此强调指出, |
| 关 键 词： | 核测井 回归分析处理 原位测定矿层品位 |
| 收稿时间： | 1993-12-21 |
THE IN-SITU DETERMINATION OF ORE BED GRADE BY MEANS OF WELL LOGGING |
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| Zeng Fanchao.THE IN-SITU DETERMINATION OF ORE BED GRADE BY MEANS OF WELL LOGGING[J].Geophysical and Geochemical Exploration,1994,18(5):339-352. | |
| Authors: | Zeng Fanchao |
| Institution: | 1. Department of Geoexploration, Minisrtry of Ceology and Mineral Rerources, Beijing 100812; 2. Grophysical Prospecting Party, Shandong Bureau of Ceology and Mineral Resourcs, Jinan 250013; 3. No. 207 Geological Party, Sichuan Bureau of Geology and Mineral Resources. Leshan 614000 |
| Abstract: | The utilization of well logging in the in-situ dotermination of ore bed grade is expected to be a research field with broad prospects, especially in places where coring is difficult to conduct. Techniques corrently used in China for grade determination by means of well logging can be grouped into two types. i. e. nuclear log and regression analysis. The former technique has been used to determine fluorite grade with the help of neutron-activation log, and the latter technuique has been applied to the glauberite and uraniferous phophorite exploration by using gamma-ray log.Both techniques have been carried out with success,and, as a result, a set of effective working procedures have been summarized.The determination of ore bed grade by means of well logging proves to be superior to the conventional method which basically consists of drilling and coring, visaal sampling and core assay. The edvantages of well logging lie in the following aspects: it conducts continuous measurement to obtain complete information on ore beds; the detedion radius of well logging can be much larger than that of coring; well logging can get rid of the errrors that exist in chemical analysis due to poor core recovery and random sampling. Therefore,well logging yields more reliable data for grade determination, as is clearly demonstrated by practical examples of three ore districts in China. Well logging may serve as a guide for reasonble sampliny and can be used effusively to work cot a program for further exploration. When core recovery is low or when certain ore beds are not intersected by drilling,well logging can be used. The result obtained by well logging is are the same as that obtained by core analysis because they are two different techiques that work independently,using different sampling methods and determine differeknt types of samples. Thus, the credibility of grade determination depends not only on measurement accuracy, but also on the actual grade of ore bed that the determination by each technique can represent, which suggests that the result of core assay can not be regarded as the only standard for grade of ore beds. |
| Keywords: | nuclear log repression analysis in-situ determination of ore bed grade |
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