鄂尔多斯盆地南部MT剖面综合地球物理解释

Comprehensive geophysical interpretation based on magnetotelluric profile in southern Ordos Basin

1. 同济大学海洋地质与地球物理系,上海 200092;2. 石油地质中心实验室,无锡 214151;3. 华北石油地质局,郑州 450000

Department of Marine Geology and Geophysics, Tongji University, Shanghai 200092

通过对鄂尔多斯盆地南部测量剖面73个大地电磁测深点资料的处理, 将各点的测深曲线进行了归纳分类, 探讨了曲线类型的电性层划分与地质属性的关系。在MT资料处理解释的基础上, 对模型作了二维正演计算, 同时又对测区的重磁异常作了进一步的处理, 并结合地质、钻井资料进行了综合地质与地球物理解释, 对查明该地区的地电结构、沉积特征、深部构造和断裂展布以及基底性质提出了新的认识。

Through the data processing of 73 magnetotelluric (MT) sounding points in southern Ordos Basin, we classified the MT curves and probed into the relation betwee curve type classification andgeological attribute.Based on the MT data processing and interpretation,we made 2-D forward calculations, further processed the gravity and magnetic anomly in the area, and catried out geologica andgeophysical comrehensive interpetation combining with geologica and drilling data. All these are helpful to better understanding of geoelectrical texture, sedimentary characteristics, deep structures, faultextent and basement property in the area.