【摘要】 借助层序地层学技术、地震特征识别方法以及地震反演手段,对川东北元坝地区上二叠统长兴组台缘生物礁滩体系的发育特征进行了详细研究,发现长兴组可分为2个三级层序,其中下部为成滩层序,上部为成礁层序。生物礁主要发育于上部层序的高位体系域内。在地震剖面和反演剖面上揭示出5个成礁旋回,其中前2期生物礁为退积式生长,后3期生物礁为进积式生长。波阻抗反演平面图也显示了生物礁的礁前滩和礁后潍的相带分类,表明台地内的台内生屑滩主要发育于台地的南部。更多还原

【Abstract】 Based on sequence stratigraphy,seismic section and wave impedance inversion,the characteristics of platform margin reef-bank system of Changxing formation are studied in Yuanba area in detail.It’s found that the Changxing formation is consisted of two third order sequences,and the bioclastic banks are formed in the lower sequence while the reef mainly is formed in the upper sequence.Five reef formation cycles are identified by the seismic section and wave impedance profile,of which the first two reefs are regressive and the other three reefs are prograding.The wave impedance inversion plan figure shows the spatial distribution and the microfacies of the Changxing reef-bank system.更多还原