Abstract The overall geometry of sedimentary basins is driven by a complex interplay between subsidence, water-level variations, sedimentation rates and basin-margin topography. Seaward movement of the shoreline is driven by either high sediment input or by base-level drop. The influence of the specific driving mechanisms is often overwritten by subsequent burial and compaction effects or it is below the resolution of observational data. Our main aim is to describe and discuss the influence of these internal and external forcing factors and demonstrate their sedimentary response, particularly the related unconformities and clinoform geometries in a deep lacustrine setting. To this aim, 3D numerical simulations were performed using DionisosFlow stratigraphic forward modeling software. Models are constrained by seismic and well data from the Drava Basin part of the SW Pannonian Basin, Central Europe. A wide range of parameters, such as subsidence rates, lake-level curves and sedimentation rates were compared and analyzed. Post-rift subsidence and inversion of the basin have been simulated together with the main sedimentary transport routes. Our calculation infers that paleo-water depth could have reached ca. 1300 m in the deepest parts of the basin. Furthermore, our models show that differential compaction, subsidence and lateral variations of the sediment supply result in apparently descending shelf edge trajectories and onlapping clinoform surfaces that are often misinterpreted as base-level drops. By analyzing the sedimentary response to different climatic variations, we argue that there is no direct indication of a major base-level drop in the Drava Basin, which was much larger than the seismic resolution, i.e. 40–50 m. Modeling also infers that autoretreat and autocyclic variations are more effective at low sediment supply and higher amplitude lake-level variations.

中文翻译：

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湖盆中的强制或正常回归信号？SW Pannonian 盆地 3D 地层正向建模的见解

摘要 沉积盆地的整体几何形状是由沉降、水位变化、沉积速率和盆地边缘地形之间复杂的相互作用驱动的。海岸线的向海运动是由高沉积物输入或基线下降驱动的。特定驱动机制的影响通常会被随后的埋藏和压实效应所覆盖，或者低于观测数据的分辨率。我们的主要目的是描述和讨论这些内部和外部强迫因素的影响，并展示它们的沉积响应，特别是深湖环境中的相关不整合面和斜面几何形状。为此，使用 DionisosFlow 地层正演建模软件进行了 3D 数值模拟。模型受到来自中欧 SW Pannonian 盆地的 Drava 盆地部分的地震和井数据的约束。比较和分析了范围广泛的参数，例如沉降率、湖泊水位曲线和沉降率。与主要沉积输运路线一起模拟了盆地的裂谷后沉降和反转。我们的计算推断古水深可能已达到约。盆地最深处1300m。此外，我们的模型表明，沉积物供应的不同压实、下沉和横向变化导致明显下降的陆架边缘轨迹和重叠的斜面表面，这通常被误解为基础水平下降。通过分析沉积物对不同气候变化的响应，我们认为没有直接迹象表明 Drava 盆地的基准面下降幅度远大于地震分辨率，即 40-50 m。建模还推断，自退和自循环变化在沉积物供应量低和湖水位变化幅度较大的情况下更有效。