陆相可容空间变化及层序发育控制因素分析

Analysis on controlling factors of terrestrial containable space variation and sequence evolution.

陆相沉积环境与海相沉积环境有很大的差异,相应的可容空间及层序演化控制因素也不同。分析了陆相可容空间的主要控制因素及其对层序发育的影响,研究表明陆相层序主要发育低水位体系域、湖泊扩张体系域和湖泊收缩体系域。构造因素是陆相层序的主要控制因素,它控制了一、二级层序的演化;气候、沉积物供给、湖海短期沟通、河流平衡剖面迁移等因素在较短时期内或局部地区可以成为主要控制因素,在其影响下可形成三级层序。通过编制基准面变化曲线可以分析可容空间变化,预测层序发育情况。

There are many differences between terrestrial and marine environment with different controlling factors of corresponding containable space and the sequence evolution. The main controlling factors of the terrestrial containable space and their effect on the sequence evolution were analyzed . Study shows that terrestrial sequences develop mainly lowstand system tract,lake expand system tract and lake shrink system tract. Structure is the main controlling factor on terrestrial sequences and it controlled the evolution of first and second-order sequences. Climatic,sediment supply,short -lived lake-sea linking and fluvial balanced cross section migration could be main controlling factors in shorter time or special region,and third-order sequence may be formed under these factors. Mapping base-level variation curve may analyze containable space and predict the sequence development situation.