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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。
With the help of sequence stratigraphy, seismic feature identification and seismic inversion, the development characteristics of the reef-beach system in the margin of Changxing Formation in the Upper Permian of the Yuanba area in northeastern Sichuan Province are studied in detail. It is found that Changxing Formation can be divided into 2 A three-level sequence, of which the lower part of the sequence for the beach, the upper part of the reef sequence. Reefs mainly develop in the upper system tract of the upper sequence. Five reef-forming cycles were revealed on the seismic profile and the inversion section, of which the first two reefs were retrograde growth and the second three reefs were progressive deposits. The wave impedance inversion plan also shows the classification of the reef’s front reef and the reef Weifang, indicating that the Taiwan-born swarms within the platform mainly develop in the southern part of the platform.