【摘要】 以钻井岩心资料为主,结合野外露头剖面和地震剖面资料,对四川盆地中二叠统层序界面及层序地层特征进行了研究,确立了该区层序界面识别标志,建立了四川盆地中二叠统层序地层格架,将该区中二叠统划分为5个三级层序(SQ1-SQ5),平均延时约4Ma。盆地在该时期为稳定的浅海相碳酸盐岩沉积,处于盆地的发育成熟阶段。各层序厚度呈逐步增加趋势,SQ4期沉积厚度最大。层序样式以TST>HST为主,体现盆地层序期内一个缓慢海进—快速海退的过程。从SQ4—HST期开始盆地上升接受剥蚀,至SQ5期剥蚀面积达最大,可延伸至盆地中部。更多还原

【Abstract】 Through considerable drilling and logging data,com-bined with the outcrop section and so on,we carried on research on the sequence boundary of middle Permian in Sichuan basin and the characteristics of each sequence,estab-lished stratigraphic framework and divided into 5 third-or-der sequences(SQ1-SQ5),the average delay time is about 4 Ma.In this period Sichuan basin was a stable neritic facies carbonate deposition,and is in the mature stage of the basin.The thickness of each sequence was gradually increasing tendency and in the period of SQ4 the thickness of is maxi-mum.The sequence style is mainly of TST>HST,reflects the process of a slow transgression-rapid regression in this period.From the period of SQ4HST the basin began to rise and accept denudation,to the period of SQ5,the area of denudation was up to the maximum and could be extended to the center of basin.更多还原