Characteristics of Accommodation Space Transformation of Lacustrine Basin
Accommodation space change was complicated in lacustrine basin for its multi-material sources,multi-depocenters,differential tectonic subsiding and limited water area and so on. But tectonic subsiding,sediment supplying and water body played an important role. The accommodation space had the accordant changing in the basin,but it had the discordant changes in different areas. In faulted lake basin,accommodation space changes were dominated by single facter. During the early stage of the lower and middle members of Shahejie Formation in Boxing Sag,the accommodation space was dominated by tectonic subsiding and it increased in the whole sag,but at the later stage the sediment supplying was the main facter and made the accommodation change discordant. In the depression basin,the accommodation space change was influenced by the composited factor. In Songliao Basin,the accommodation space changes experienced three times affected by tectonic subsiding and sediment supplying during the mid-Cretaceous. The unified changes of accommodation space supplements and modifies the sequence stratigraphy of lacustrine basin.