重磁场联合反演技术在庐纵盆地基底构造解释中的应用

安徽庐枞地区位于怀宁庐江“磁高重高”一级异常带的枞阳--庐江次级异常区.采用重磁场联合反演技术的多层面边缘检测方法(WORMS法)对庐枞地区多层面边缘进行检测,得到了地下不同深度的密度或磁性信息以及重、磁异常边界.根据上延层高度布格重力异常,结合航磁区域和局部异常分布特点,进行了断裂构造的推断与基底隆起区的划分,再利用空间分析技术对这些圈闭区域进行相交计算,划分出重磁同高、重低磁高、重高磁低、重磁同低等4种组合空域,提出庐枞盆地磁性基底为“一隆两凹”形态(庐枞盆地基底界面三维结构图)的新认识.

Application of gravity and magnetic field Joint inversion to interpretation of basement structure of the Lujiang-Zongyang basin

Lu-zong area is located in Lujiang-Zongyang anomly in Huaining-Lujiang electric high and gravity high area.WORMS tehnique of gravity and electric field joint inversion is applied to boundary check-up of layers in Lu-zong area and density and magnetic data at different depth and the anomly boundaries are obtained.According to the upward continuation height of bouguer gravity anomaly and combined with aeromagnetic regional and local anomaly characteristics,we deduce the fault,fractures and delineate basement uplifts.And then we use spatial analysis techniques to make intersection calculation of entrapment and puts forward 4 spatial combinations of both high of gravity and magnetism,gravity low but magnetism high,gravity high but magnetism low and both low of gravity and magnetism thus basement of Lu-zong basin is newly configured by 2 domes and 2 depressions.