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文章运用当前地质研究与勘探工作中的重要方法──平衡地质剖面法，对大巴山前缘地区的油气构造条件进行了研究。研究认为，大巴山前缘的构造变形由强到弱（自北东向南西），可分为四个带：①位于城口—高观寺断裂以南、坪坝—雷公坝—乌龙断裂以北的断裂构造带；②位于坪坝—雷公坝—乌龙断裂以南、河口—关庙一渔沙断裂以北的断裂—褶皱带；③位于河口—关庙—渔沙断裂以南、李子垭—沙沱—线以北的褶皱带；④位于李子垭—沙沱—线以南的前锋褶皱—构造复合带。区内滑脱构造、台阶状断层以及断层相关褶皱发育，断层转折褶皱是良好的圈闭构造。平衡剖面的研究，为分析地下一定深度的构造提供了新思路和新方法，结合本区内的生、储、盖组合单元情况，提．出了南门场构造带与马槽坝构造带之间、温泉井构造带与大巴山前缘构造带之间等５个有利的勘探远景区块。

OIL-BEARING STRUCTURE ENVIRONMENT IN THE FRONTAL DABASHAN

??By the use of the important method in present geologic resrarch and exploration-balanced geologic section,research is done on the oil-bearing structure environment in the frontal Dabashan.The research shows that the structural deform in the frontal Dabashan is from strong to weak(from eastnorth to westsouth)and can be divided into four belts:??the faulted structural belt lying in the south of Chengkou-Gaoguanshi fault and the north of PinbaLeigongba-Wulong fault,??the faulted-fold belt lying in the south of Pingba-Leigongba-Wulog fault and the north of Hekou-Guanmiao-Yusha fault,??the folded belt lying in the south of Hekou-Guanmiao-Yusha fault and the north of Liziya-Shatuo,??the front folded structural belt lying in the south of Liziya-Shatuo.In this area,decollement structure, step fault and fault fold are well developed,and fault fold is a good trap structure. The research of balanced cross section provides new thoughts and new methods for analysing the underground structres.Considering the soure-reservoir-caprock composile condition in this area. five blocks with profilable exploration potential are point out.They lie respectively between Nanmenchang structural belt and Machaoba structural belt and between Wenquanjin structuralbelt and frontal Dabasan structural belt.