基准面与可容空间变化分析及应用

The Analysis of Base-level and Accommodation Space Change and Its Application

基准面是控制沉积与侵蚀作用的临界面，基准面的周期性运动从根本上影响着层序的形成。基准面及可容空间变化分析，有助于对层序内部结构的认识和层序的正确识别与划分。对松辽盆地基准面变化研究结果表明，层序内部体系域划分以四分为宜；二级基准面旋回具有明显的全球可对比性，而三级基准面旋回更具地方性。

Base-level is a critical surface that decides which one of the two processes, erosion and sedimentation, will happen. So, the cyclical movement of base-level basically controls the formation of sequence. With the analysis of base-level and accommodation space change, we can understand the internal structure of sequence better, recognize and classify sequences more accurately. The study on base-level change of Songliao basin indicate that there should be four systems tracts within a sequence, and the second order base-level cycle is obviously isochronic, while the third order base-level cycle is a local one.