雪峰山西侧深部构造的特征——来自大地电磁测深(MT)的新证据  

Deep structure characteristics on the western side of the Xuefeng Mountain: New evidence from megnetotelluric(MT) sounding

作　　者：汪启年[1] 李涛[1] 朱将波 

机构地区：[1]安徽省勘查技术院,安徽合肥230031

出　　处：《地质通报》2012年第11期1826-1837,共12页Geological Bulletin of China

基　　金：中国地质调查局地质调查项目<雪峰山西侧海相地质调查及综合研究>(编号:1212010782003)

摘　　要：为了解雪峰山西侧地区的深部构造特征,促进油气勘探战略选区,使用大地电磁(MT)测深技术,结合测区的地质和物性特征,通过定性分析和定量计算,对研究区的断裂、褶皱、地层展布进行地面-地覆对比分析。结果表明,雪峰山西侧地覆的构造单元划分与地面基本一致,MT剖面东段反映的雪峰山隆起区深部巨厚低阻层的属性可能为多次挤压形成的破碎层。西段显示秀山以西低阻标志层清晰,震旦系—寒武系地层发育厚度较大,构造变形相对较弱,侧向延伸稳定,是油气勘探的有利区,为研究区海相下组合油气勘探战略选区提供了重要依据。To understand the deep structure characteristics on the western side of the Xuefeng Mountain and to promote the selection of petroleum exploration strategic areas, the authors comparatively analyzed the faults, folds and the surface and subsurface stratigraphic distribution in the study area by using megnetotelluric（MT） sounding technology in combination with the geological and physical properties in this area to perform qualitative analysis and quantitative calculation. The results show that the subsurface tectonic unit di- vision is basically identical with the surface tectonic unit division on the western side of the Xuefeng Mountain area. It is inferred that the huge thickness of the low resistance layer at the depth of the Xuefeng Mountain uplift region shown on the MT profile is probably the shattered layer caused by the repeated compression process. An investigation of the western part of the MT profile shows that, in the area west of the Xiushan Mountain, the low resistance marker beds is distinct, the thickness of the Sinian-Cambrian strata is great, the tectonic deformation is comparatively weak, and the lateral extension is stable; therefore, this area is considered to be a favorable area for petroleum exploration. This understanding provides important basis for the selection of petrolettm exploration strategic areas in the marine lower assemblage.

关 键 词：雪峰山西侧 大地电磁(MT)测深 构造特征 油气勘探 

分 类 号：P618.130.2[天文地球—矿床学]