大井坡航空地球物理试验场典型剖面综合地球物理解释

Integrated Geophysical Interpretation of the Typical Profile of Dajingpo Airborne Geophysical Test Site

全面采集并分析我国首个航空地球物理综合实验场(大井坡实验场)的地质和地球物理特征,综合地质、地形、遥感、磁、重力和电磁等资料,在试验场内选取3条典型剖面,以电阻率测深剖面为约束,采用多边形2.5D棱柱体模型组合法建立典型剖面地质-地球物理模型;对剖面进行重、磁联合正反演,并通过剖面与平面相互验证的方式,开展重、磁、电综合解释研究。通过研究,全面掌握了试验场内断裂及岩性构造的分布规律,试验场被中部近EW向和北部呈NEE向展布的两条断裂分割成南部褶皱区、中部断隆区和北部坳陷区3个区域,为试验场综合解释填图提供了依据和约束条件。

On the basis of analyzing the geological and geophysical characteristics of Dajingpo airborne geophysical test site which is the first airborne geophysical integrated test site in China,three typical profiles were selected for the research on the geological,topography,remote sensing,magnetic,gravity,and electromagnetic data in the test site.By taking the resistivity sounding data as the constraint,aphysical-geological model was set up through 2.5Dpolygon prism model combination.The integrated interpretation on typical profiles was carried out through joint forward and inversion of gravity and magnetic data.The characteristics of fault and tectono lithology of the test site were mastered.The near EW trending faults in the middle and the northern NEE trending fault separate the test site into three regions：the southern fold zone,the central fault uplift zone,and the northerndepression zone. All of the research results could provide bases and constraints for further comprehensive interpretation mapping of the test site.