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在钻井中利用自然伽玛测量划分磷矿层,目前在地质勘探中已经应用。1982年在湖北某磷矿Ⅰ—1号矿体西段施工的10个钻孔,应用自然伽玛法测井,不但有效地划分了地层和较精确地确定了磷矿层的埋深、厚度,而且对测定钻探打薄打漏的矿层和解释矿石中P_2O_5的含量也均收到了良好的效果。本文将扼要介绍这方面的应用情况。一、矿区地质概况矿区位于扬子准地台北缘龙门山-南大巴山古台缘坳陷,北邻秦岭地槽,西接黄陵古陆。矿床为准地台型浅海湾(盆地)沉积的层状磷块岩,赋存于上震旦统灯影组中段下部,上覆
The use of natural gamma ray surveys to divide phosphorite formations in drilling is currently used in geological exploration. In 1982, a total of 10 boreholes drilled in the western section of a phosphate rock mine No. 1-1 in Hubei Province were measured by using natural gamma ray logging method. Not only the strata were divided effectively, but also the depth and thickness of the phosphate rock layer , But also received good results in determining the amount of P_2O_5 in ore by measuring the amount of P_2O_5 in the mine. This article will outline the application of this area. I. Geological Overview of the Mining Area The mining area is located in the Longmen Mountains - Guantage depression of the South Dabashan Mountains on the northern margin of the Yangtze Platform, with the Qinling Gully to the north and the Huangling Old Land to the west. The deposit is a stratiform phosphorite deposited in quasi-platform type shallow bays (basins) and occurs in the lower part of the Upper Sinian Dengying Formation with overlying