基于位场分离方法寻找梅山铁矿接替资源

发布时间：2018-11-13 16:26

【摘要】：在重力勘探中,重力异常分离的目的是消除干扰,有针对性地突出目标异常.为探讨各种分离方法的理论基础及使用效果,应用位场分离方法对理论模型产生的重力场进行分离并做误差分析.试验结果表明:趋势分析法和解析延拓法获得的区域异常场重力等值线呈长轴为南北向的椭圆状特征,局部异常在南北向呈"两低夹一高"的特征,与理论模型布格重力异常图有差别.经剖面线形态比较和误差分析,二阶趋势分析、向上延拓225 m分离出的局部场高值区基本与理论模型相符.插值切割法和匹配滤波法获得的异常场重力等值线仍呈同心圆状,与模型重力等值线形态吻合.当切割半径为4 m、切割2次时,其剖面线整体拟合效果好于解析延拓法,但中心点附近的曲线拟合效果较差,且切割次数增大时,易产生震荡效应.匹配滤波法的关键在于合理地选取功率谱曲线的中高、低频段,通过适宜的滤波器滤波以提取不同波数成分的异常场.为寻找梅山铁矿接替资源,对该区重力异常进行分离.实践表明:二阶趋势分析、向上延拓700 m、切割半径10 m切割一次、匹配滤波法的分离结果具有较好的一致性:萝卜山—刘家村带、梅山村南部、黄林库—吴家洼带、主矿区深部及东南部存在幅值较高的剩余重力异常,揭示了铁矿资源分布的一般特征,为寻找梅山铁矿接替资源指明了方向.
[Abstract]:In gravity exploration, the purpose of gravity anomaly separation is to eliminate interference and highlight the target anomaly. In order to discuss the theoretical basis and application effect of various separation methods, the potential field separation method is used to separate the gravity field produced by the theoretical model and the error analysis is made. The experimental results show that the gravity isolines of the regional anomaly field obtained by trend analysis and analytic continuation method are ellipsoidal with long axis, and the local anomalies are characterized by "two low and one high" in the south and north direction. It is different from the theoretical model Bouguer gravity anomaly map. Through the comparison of profile shape and error analysis, the second order trend analysis shows that the high value region of local field separated by 225m upward continuation is basically consistent with the theoretical model. The gravity isolines obtained by the interpolation cutting method and the matched filtering method are still concentric and consistent with the shape of the model gravity isolines. When the cutting radius is 4 m and the cutting time is 2 times, the whole fitting effect of the profile line is better than that of the analytic continuation method, but the curve fitting effect near the center point is poor, and when the cutting times increase, the oscillation effect is easy to occur. The key of the matched filtering method is to reasonably select the middle and low frequency bands of the power spectrum curve, and to extract the abnormal field of different wavenumber components through the appropriate filter. In order to find the replacement resources of Meishan Iron Mine, the gravity anomaly in this area is separated. The practice shows that the second order trend analysis, the upward continuation of 700 m, the cutting radius of 10 m, the separation results of the matched filtering method have good consistency: radish mountain-Liujiacun belt, southern Meishan village, Huanglinku-Wujiawa belt, There are residual gravity anomalies with high amplitude in the deep and southeast of the main mining area, which reveals the general characteristics of iron ore resources distribution and points out the direction for finding the replacement resources of Meishan Iron Mine.
【作者单位】：中国电力工程顾问集团西南电力设计院有限公司;河海大学地球科学与工程学院;江苏省地质勘查技术院;
【基金】：江苏省自然科学基金(BK20140844) 江苏省地质矿产勘查局科研技改项目(2014-KY-15)联合资助
【分类号】：P618.31;P631.1

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