重磁力联合反演在研究复杂盆地基底构造中的应用

本文采用重磁力联合反演方法,计算了民和盆地基底深度和视磁化强度。针对该盆地特点,设计了等效和非均质重力反演模型,在约束条件下分块反演得到准确可靠的基底深度;用基底深度和航磁异常反演基底视磁化强度,根据岩石磁化率参数,判定基底岩性横向分布。该方法不仅能提供盆地基底构造形态,而且能提供基底岩性信息。

APPLICATION OF INVERSION OF COMBINED GRAVITY AND MAGNETIC DATA TO THE STUDY OF THE BASEMENT STRUCTURE OVER A COMPLEX BASIN

In this paper, combined gravity and magnetic inversion method of potential field is applied to the calculation of the basement depth and apparent magnetization in the Minghe basin. According to the characteristics of this basin, models of equivalent and inhomogenous gravity inversion were designed. Based on the different models in different areas of the basin, the basement depth gained by the inversion was precise and reliable under the constraint conditions. The apparent magnetization of the basement was inversed with basement depth and aeromagnetic anomaly. According to the magnetic susceptibility data, the basement lithological distribution was studied. Therefore, the method can supply not only basement structure but also basement lithological information.