Applications of Accommodation Concept to Sequence Study in a Continental Rift Basin in Case of Paleogene, Bohaiwan Basin
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摘要: 以渤海湾盆地下第三系为例，将可容纳空间概念应用于陆相断陷盆地层序成因分析和层序划分。陆相断陷盆地层序、准层序组和准层序的发育过程和基本特征，可分别根据二级、三级和四级幕构造沉降过程中新增可容纳空间与同期沉积物供给体积的对比关系解释，层序边界和体系域分界面的形成条件亦可通过分析可容纳空间变化加以描述和认识。由可容纳空间演变特点分析，引出了一个新概念———可容纳空间转换面，并用于识别层序边界和体系域分界面。Abstract: The concept of depositional accommodation has been applied to sequence genesis analysis and sequence di- vision for continental rift basins with examples from Paleogene, Bohaiw an basin.The developing process and its major characteristics of a sequence, a qarasquence set and a parasequence in a continental rift basin can be in- terpretted respectively according to the changing of new space added during the 2nd, the 3rd and the 4th order episodic tectonic subsidence in corresponding to the volume of sediments supplied.Conditions to fo rm bounded surfaces of sequences and systems tracts can also be described and understood through an analysis of deposi- tional accommodation changes.As a result of accommodation evolution analysis, a new concept, the turn - round surface of accom modation variation, has been introduced and applied to recognize boundaries of se- quences and systems tracts.
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