基于LWD随钻自然伽马测井数据的砂岩铀矿储层三维储量预测方法研究  

Reserve Prediction Method of Sandstone Uranium Reservoir Based on Data of Natural Gamma Logging While Drilling

作　　者：李召坤 杨睿 胡柏石[1] 杜志明[1] 赵利信 LI Zhaokun;YANG Rui;HU Baishi;DU Zhiming;ZHAO Lixin(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《原子能科学技术》2021年第S02期373-379,共7页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目。

摘　　要：目前砂岩铀矿单元储量计算主要基于4口勘探井的测井资料,数据量小,预测精度较低。为提高单元储量计算过程中的基础数据量,提高砂岩铀矿单元储量的计算精度,本文将水平井自然伽马值通过图版校准消除井径和泥浆影响后,利用公式转化为定量伽马值,并与常规直井定量伽马测井数据相结合,通过双线性插值的方法计算节点品位和厚度,以此为基础计算单元储量。利用此方法对新疆某地浸水平井井场的铀矿储量分布进行了预测,结果显示,采用本文所述方法计算单元储量可消除低放射性地层对储量预测的影响,计算结果较常规4点式单元储量预测方法修正了17.64%。以上结果表明,该方法对单元内铀资源储量分布刻画更精细,储量计算精度更高。At present,the unit reserves calculation of sandstone uranium deposits is mainly based on the logging data of four exploration wells,which is of low accuracy.In order to increase the amount of basic data in the calculation process of unit reserves and improve the calculation accuracy of unit reserves of sandstone uranium deposit,a new method for predicting the reserves of sandstone uranium deposit was proposed in this paper.In this method,the natural gamma value was converted into quantitative gamma value by formula after eliminating the influence of well diameter and mud through the calibration of the chart.Combined with the quantitative gamma logging data of conventional vertical wells,the nodal grade and thickness were calculated by bilinear interpolation method,and the unit reserves were calculated on this basis.This method was used to predict the uranium reserve distribution of a certain horizontal leaching well site in Xinjiang.The results show that the influence of low radioactivity strata on the reserves prediction can be eliminated by using the method described.Compared with the conventional four-point element reserve prediction method,the calculated results are revised by 17.64%.The above results show that this method is more precise in describing the distribution of uranium reserves in the unit and has higher accuracy in reserve calculation.

关 键 词：储量预测 定量伽马 自然伽马 双线性插值 铀矿水平井 

分 类 号：P624.7[天文地球—地质矿产勘探]