内蒙古西部银根-额济纳旗盆地重力场与 断裂构造的特征

为了研究银根-额济纳旗盆地的构造特征，为该区油气资源远景调查评价提供依据，系统地收集、研究了已有的重力调查资料，分析了研究区重力场的特征及其成因，推断了研究区的断裂构造体系。研究区区域重力异常主要是由莫霍面起伏变化引起的，剩余重力异常重力高与重力低相间分布的特征，可能一方面反映了研究区凹陷与隆起分布的范围及展布特征，另一方面反映了凹陷与隆起之间发育非对称的断裂。研究区主要发育北东东向(北东向)、北西西向2组断裂，这2组断裂对基底结构、性质、隆坳格架及中生代盆地展布起重要的控制作用。基底断裂将研究区分割成多个块体，使盆地形成凹、凸相间的结构特征。

The characteristics of gravity field and fault structure in Yingen-Ejinaqi basin, western Inner Mongolia

In order to study the structural features of Yingen-Ejinaqi basin and provide foundations for further oil and gas resources investigation and evaluation, the characteristics and causes of gravity field have been discussed and analyzed, and the fault systems have been speculated through collecting, processing and studying the existing gravity survey data in the area. Regional gravity anomalies in study area are mainly aroused by the undulation of Moho surface. On the one hand, gravity high and gravity low of residual gravity anomaly with alternative distribution reflect the distribution range and through-going features of the sag and uplift; on the other hand, maybe reflect the asymmetric faults which develop between the sag and the uplift in study area. Two mainly groups of fault, which play an important control role in the structure and properties of the basement, framework of uplift and depression and distribution of Mesozoic basin, with NEE (NE) and NWW trend respectively developed in the study area. The basement faults divide the study area into multiple blocks, which made the Basin with the features of alternate sag and uplift.