Estimation of base level changes in geological records is an important topic for petroleum geologists. Taking the Paleocene Upper Lingfeng Member of Lishui Sag as an example, this paper conducted a base level reconstruction based on Basin Filling Modelling (BFM). The reconstruction was processed on the ground of a previously interpreted seismic stratigraphic framework with several assumptions and simplification. The BFM is implemented with a nonlinear diffusion equation solver written in R coding that excels in shallow marine stratigraphic simulation. The modeled results fit the original stratigraphy very well. The BFM is a powerful tool for reconstructing the base level, and is an effective way to check the reasonableness of previous interpretations. Although simulation solutions may not be unique, the BFM still provides us a chance to gain some insights into the mechanism and dynamic details of the stratigraphy of sedimentary basins.

中文翻译：

---

基于盆地填充模型的基准面变化：以东海盆地古新世丽水凹陷为例

估算地质记录中基准面的变化是石油地质学家的重要课题。以丽水凹陷古新世凌峰上段为例，基于盆地充填模型（BFM）进行了基层重建。重建是在先前解释的地震地层框架的基础上进行的，并进行了一些假设和简化。BFM通过用R编码编写的非线性扩散方程求解器实现，该求解器在浅层海洋地层模拟中表现出色。建模结果非常适合原始地层。BFM是重建基础级别的强大工具，并且是检查先前解释的合理性的有效方法。尽管模拟解决方案可能不是唯一的，