对大巴山地区最新1：20万航磁资料进行处理，分析大巴山地区航磁异常特点，找出推覆体下磁性结晶基底存在的证据；通过帕克尔界面反演法定量反演计算出磁性结晶基底的深度及范围，确定四川盆地的结晶基底应以陕西安康-竹山断裂为界；重新厘定盆地东北部边界，计算出大巴山推覆带推覆距离约100 km，并推测推覆带下可能存在四川盆地沉积地层。为巴山地区深浅部构造关系的系统解析以及四川盆地油气勘探远景提供一定的参考。%The authors processed the latest 1: 200 000 airborne magnetic data of Dabashan area, analyzed the aeromagnetic anomaly characteristics, and found out the evidence of the existence of magnetic crystalline basement; through parker boundary layer quantitative inversion method, the authors calculated the depth and scope of the magnetic crystalline basement, and determined that the crystalline basement of Sichuan basin extended to the Ankang-Zhushan fracture community in the north-east direction, meanwhile the authors redefined the northeastern boundary of basin, calculated the napped distance of Daba Mountain nappe of about 100 km, and presumed that there might existed sedimentary strata below the nappe. The conclusions could provide a reference for the system analysis of the relationship between deep and shallow structure and the long-range perspective of oil and gas exploration in Sichuan Basin.
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