利用实测重力垂直梯度反演长白山地区一剖面的深部构造

Deep structure iversion by measurement of verhical gradient of gravity for a profile of Changbai Mountain area

针对重力梯度高分辨率的特点,利用在长白山地区实测的重力垂直梯度数据,采用梯度空间参量图反演其深部构造。台阶模型试验表明:重力梯度空间参量图能给出构造倾角和倾面的信息,结合重力梯度剖面和梯度空间参量图可以构建出地下构造的几何模型,进而对一些复杂构造进行解释。通过对比实测布格重力异常和实测重力梯度异常,重力梯度比重力异常的分辨率更高;将梯度法应用到实测重力梯度数据的处理中,结果表明:该方法对确定密度变化界面的水平位置和深度具有非常好的效果。

In connection with the characteristics of high-resolution in gravity gradient,we used the data of measured vertical gravity gradient in Changbai Mountain area to inverse its deep structure by using gradient space plot.The step models prove that the gradient space plots can give the information of the structural dip and pour surface.Combined with gravity gradient profile,we can build a geometric model of the subsurface structure,and then explaine some of the complex structure.Based on the measured Bouguer gravity anomaly and the measured gravity gradient anomaly contrast,the gravity gradient has higher resolution than gravity anomaly.When the gradient method is applied in the measured gravity gradient data processing,the results show that the method to determine the density changes in the level of the interface position and depth has good effect.