Base level changes based on Basin Filling Modelling: a case study from the Paleocene Lishui Sag, East China Sea Basin
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ORIGINAL PAPER
Base level changes based on Basin Filling Modelling: a case study from the Paleocene Lishui Sag, East China Sea Basin Jing‑Zhe Li1,2 · Pi‑Yang Liu3 · Jin‑Liang Zhang4 · Shu‑Yu Sun5 · Zhi‑Feng Sun1,2 · Dong‑Xing Du1,2 · Ming Zhang4 Received: 28 January 2020 © The Author(s) 2020
Abstract 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. Keywords Sequence stratigraphy · Base level · Basin Filling Modelling · Wheeler diagram · Paleocene · Lishui Sag
1 Introduction Petroleum exploration is committed to identifying the spatial and temporal distribution of petroleum system elements (such as source, reservoir and transportation, etc.) to identify more oil and gas resources (Hu et al. 2016, 2018; Li et al. 2020; Zhu et al. 2020). However, the diversity of the underground world and the nature of its difficulty to observe directly surely increase the complexity of this work. Following sedimentary facies model, the advent of sequence Edited by Jie Hao * Zhi‑Feng Sun [email protected] 1
College of Electromechanics, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China
2
Geo‑Energy Research Institute, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China
3
School of Science, Qingdao University of Technology, Qingdao 266520, Shandong, China
4
Department of Geography, Beijing Normal University, Beijing 100875, China
5
King Abdullah University of Science and Technology, Jeddah 23955‑6900, Saudi Arabia
stratigraphy has brought another revolution to this industry and offered a powerful methodology to analyze and characterize the underground space (Yang et al. 2018; Gao et al. 2018). Although many schools still exist debating on some concepts of sequence stratigraphy, base level is a universally accepted term that denotes a driving force ensemble in forming stratigraphic sequences. However, ambiguity may exist when talking about the definition of base level. To avoid misunderstanding, here we consider the base level definition below. The base level approximates the sea level and meets the fluvial profile equilibrium at the shoreline (Catuneanu 2006; Miall 2016).
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