【摘要】 根据野外地质调查、地震资料解释以及大量岩心分析化验等资料 ,探讨了大巴山前陆盆地的形成及演化 ,分析了油气勘探潜力。研究结果表明 ,大巴山前陆盆地形成始于燕山中幕 ,盆地演化经历了J1 J12 陆内坳陷湖盆阶段、J22 J3 前陆盆地阶段、K1 N盆地萎缩阶段以及喜马拉雅期最终定型阶段。大安寨段和凉高山组两套优质烃源岩的有机质丰度高 ,有机质类型以Ⅱ1型和Ⅱ2 型为主。侏罗系发育大安寨段、凉高山组自生自储型和下沙溪庙组下生上储型 3套生储盖组合。有利勘探区带包括大巴山前冲断带、川北凹陷带和川中低隆起带。更多还原

【Abstract】 On the basis of outcrop survey,seismic interpretation and a lot of coring data,the evolution and exploration potential of Dabashan foreland basin were analyzed. This foreland basin was formed in the mid-Yanshan cycle and underwent four stages including J 1—J 1 2 depression stage,J 2 2—J 3 foreland basin stage, K 1*.N basin shrunk and final deformation of thrust-folded end in Himalayan period. In this basin, two sets of high-quality resource rocks developed in the Daanzhai Formation and Lianggaoshan Formation have high abundance of organic matters which mainly contain Ⅱ 1 type and Ⅱ 2 type kerogen. The favorable assemblages of source-reservoir-cap rocks in Jurassic include self-generated and self-reservoir type Daanzhai Formation and Lianggaoshan Formation as well as lower-generated and upper-reservoir type lower Shaximiao Formation. The favorable plays include the thrust belt in Dabashan area,sag in the north Sichuan province and uplift in the central Sichuan province.更多还原