砂岩型铀矿活性炭测氡数据处理及远景预测

发布时间：2018-02-08 08:49

本文关键词： 伊犁盆地活性炭测氡法小波分析数据处理远景预测　出处：《东华理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：氡法被广泛应用于寻找铀矿,但由于层间氧化带砂岩型铀矿上部泥岩层的存在,使其在砂岩型铀矿中应用效果曾受到质疑。近年来,氡法在砂岩铀矿找矿中被逐步应用,并取得了一定的成效,但在方法影响因素控制和解释方面还存在一些问题,需要进一步深入研究。作者在充分收集和查阅伊犁盆地区域地质资料的基础上,在该盆地南缘514矿区(已知矿区)开展了活性炭测氡方法试验研究,获得了大量氡浓度数据,并对测氡噪声影响进行了详细的讨论。首次在氡浓度数据去噪处理中引入小波分析方法,以MATLAB软件为平台,尝试一维小波分析方法去噪试验研究,得出了最优小波基、分解尺度、阈值处理等参数。将一维小波分析去噪效果与传统去噪方法进行对比,结果表明,一维小波分析方法去噪效果优于其他传统去噪方法。在氡浓度平面异常去噪中,引入了二维小波分析,也取得了良好的效果。本文分别采用二维小波分析、趋势面分析、剩余异常法、子区中位数衬值滤波法、数据重采样法和累频法等对平面实测氡浓度数据进行滤波处理,依据514矿区已知钻孔资料和已知铀矿点,将上述各种滤波方法处理后获得的氡浓度异常进行对比分析,结果表明,经处理后的氡浓度异常与已知铀矿点或铀成矿有利地带均有较好的对应关系,绝大部分已知铀矿点分布在氡浓度异常的过渡带上。据此得出结论:砂岩型铀矿的成矿有利地带与氡浓度异常均值向高值过渡的梯度带对应。可将此结论作为伊犁盆地南缘铀矿区或我国北方其他类似地区依据氡浓度异常圈定铀成矿远景区的找矿标志。本文依托《铀矿大基地资源扩大与评价技术研究》项目,在伊犁盆地南缘地区开展活性炭测氡的铀矿勘查,为了提高活性炭测氡方法在铀矿找矿中的效果,在氡浓度异常解释过程中,坚持从已知到未知的原则,将在已知矿区上总结出来的经验和铀矿化有利地带与氡浓度异常的对应关系,作为找矿标志应用到未知矿区的解释推断中,取得了良好的找矿效果。
[Abstract]:Radon method has been widely used to find uranium deposits, but its application effect in sandstone uranium deposits has been questioned due to the existence of mudstone strata in the upper part of the interlayer oxidation zone. In recent years, radon method has been gradually applied in the prospecting of sandstone-type uranium deposits. Some achievements have been made, but there are still some problems in the control and interpretation of the method influencing factors, which need to be further studied. On the basis of collecting and consulting the regional geological data of Yili Basin, the author, In 514 mining area (known mining area) of the southern margin of the basin, the method of radon measurement by activated carbon has been tested and studied, and a large number of radon concentration data have been obtained. The influence of radon noise measurement is discussed in detail. Wavelet analysis method is introduced into radon concentration data denoising processing for the first time. Using MATLAB software as the platform, the experimental research on one-dimensional wavelet analysis method is attempted, and the optimal wavelet base is obtained. The results show that the de-noising effect of one-dimensional wavelet analysis is better than that of other traditional denoising methods. Two dimensional wavelet analysis is introduced, and good results are obtained. In this paper, two dimensional wavelet analysis, trend surface analysis, residual anomaly method, subregion median contrast filtering method are used, respectively. Data resampling method and accumulative frequency method are used to filter and process radon concentration data measured in plane. According to the known borehole data and known uranium ore points in mining area 514, the radon concentration anomalies obtained by the above filtering methods are compared and analyzed. The results show that the radon concentration anomaly after treatment has a good correspondence with known uranium ore sites or uranium ore-forming favorable zones. Most of the known uranium ore points are located in the transition zone of radon concentration anomaly. It is concluded that the metallogenic favorable zone of sandstone-type uranium deposit corresponds to the gradient zone of transition from the mean value of radon concentration anomaly to the high value. In the southern margin of the plough basin, or other similar areas in the northern part of China, the prospecting marks for delineating uranium metallogenic scenic spots are delineated according to radon concentration anomalies. This paper relies on the project of "study on the expansion and Evaluation Technology of large uranium Mine Base Resources". In order to improve the effect of active carbon radon measurement method in uranium ore prospecting, in order to improve the effect of active carbon radon measurement method in uranium ore prospecting, in the process of interpretation of radon concentration anomaly, the principle from known to unknown is adhered to in the uranium exploration of the southern margin of Yili Basin. The experience summarized from known mining areas and the corresponding relationship between uranium mineralization favorable zones and radon concentration anomalies are applied as prospecting markers to the interpretation and inference of unknown mining areas, and good prospecting results have been obtained.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.14;P631.6

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