【摘要】 剥蚀厚度和高强度剥蚀时期的确定对烃源岩生烃模拟和成熟演化影响较大,依据测井、地震及实验测试资料对川东北通南巴地区剥蚀厚度和剥蚀时刻进行研究.结果表明:在晚白垩世末期川东北地区开始隆升剥蚀的时间为距今75 Ma;晚白垩时期燕山-喜山隆升运动致使研究区侏罗系和白垩系地层存在大面积高强度的剥蚀,在平面上剥蚀强度差异较大,剥蚀厚度一般为700~6 000 m,总体上看呈北东强,南西弱的特征;盆地边缘的米仓山、大巴山隆起地区剥蚀强度最大,达到了6 000 m,而在盆地内部的通南巴及龙4井背斜带剥蚀强度次之,剥蚀量为250~3 000 m,而在盆地内部剑阁、苍溪、川复56井等的洼陷区则剥蚀相对弱些,剥蚀量一般为700~1 500 m.更多还原

【Abstract】 The determination of the important erosion time and thickness has a great influence to hydrocarbon source rock evolution and hydrocarbon generation. According to seismic,logging,and laboratory test data,the erosion time and erosion thickness of the Northeast Sichuan Tongnanba area were researched. The results show that the start uplift erosion time in the late Cretaceous of the Northeast Sichuan Basin is about 75 Ma. Because of the Yanshanian-Himalayan uplifted movements in Late Cretaceous,the stratum of Jurassic and Cretaceous of the large area in the basin have a high strength missing. The erosion intensity is different in the plane and the erosion thickness is 700 ~ 6 000 m. The erosion thickness is large in the northeastern area and small in the Southwestern area. The erosion thickness of Micangshan and Dabashan uplift in the margin of the basin is maximum and achieves 6 000 m,whereas that of the Tongnanba and Dragon Well 4 anticline belt in the interior of the basin is medium and achieves 250 ~ 3 000 m. While in Jiange,Cangxi,Chuanfu Well 56 subsag area,the erosion is relatively weak and achieves 700 ~ 1 500 m.更多还原