West Siberian Sequence Stratigraphy and Mesozoic Eustasy: Testing a Quantified Sea-Level Curve Toward Application to Sedimentary Basins

通过对侏罗纪—新新统剖面的层序地层学分析，建立了西西伯利亚盆地自洽沉积模式。现有的地层模式导致了盆地地层的不一致性。我们还建议通过与构造独立区域的地层学进行比较，来检验我们之前研究中建立的量化起伏曲线（QEC）的有效性。然后，我们将应用QEC来量化西西伯利亚盆地各部分的沉降历史。开展本研究的动机是：—尽管已经积累了丰富的地层资料，但尚未进行过西西伯利亚盆地尺度的层序地层分析。—西西伯利亚的沉积史还不太清楚，因为以前的研究大多集中在当地的石油勘探上。—盆地沉降没有得到很好的控制，因为不可能从盆地地层中分离出起伏信号。—基于俄罗斯地台地层学的量化起伏曲线（QEC）必须在构造独立的盆地上进行测试，才能作为一种全球适用的工具。西西伯利亚提供了一个理想的测试案例，因为它与俄罗斯地台建立了良好的生物地层对比。—一旦对任何盆地进行测试，将有可能使用新构建的量化起伏曲线来过滤来自构造和沉积因素的起伏信号。—合成地层模型没有量化的上升输入。纳入量化起伏曲线将增强其对盆地分析的适用性。我们的工作计划包括：—数据汇编—层序地层分析—反剥离和相对海平面曲线的构建—量化起伏曲线的进一步测试—起伏曲线在盆地地层学中的应用和沉降历史的确定—利用合成地层模拟来微调参数和测试系统对参数不确定性的敏感性。我们将首先编制一个数据库，包括地球物理、岩石地层学和古生物学信息，这些信息来自西伯利亚研究所已发表的文献和未发表的数据。然后，我们将把层序地层学技术应用于西西伯利亚选定的地区，以建立一个一致的盆地地层学和沉积历史模型。拟议项目的下一部分涉及通过反剥离地层数据库中的单个点来构建当地相对海平面曲线。我们之前构建的量化海平面上升曲线将被测试，然后应用于当地的相对海平面曲线，从而有可能量化盆地不同部分的沉降和沉积历史。最后，我们将使用标准模拟程序构建西西伯利亚的合成地层学。该项目的结果将在当地和全球范围内具有重要意义，因为该项目将：-包括西西伯利亚（盆地尺度）的第一次盆地尺度层序地层分析，从而更好地了解其沉积历史。调和目前存在的区域性沉积模式之间的差异。——比以前更可靠地生成盆地沉降的量化历史。——对最近建立的量化起伏曲线在过滤盆地地层起伏信号方面的适用性进行了测试。——首次在合成地层计算机模型中使用量化起伏曲线。

9614752 Sahagian We propose to develop a self-consistent depositional model of the West Siberian Basin by sequence stratigraphic analysis of the Jurassic-Neocomian section. Existing stratigraphic models have led to inconsistencies in basin stratigraphy. We also propose to test the validity of the Quantified Eustatic Curve (QEC) developed in our previous study by comparing against the stratigraphy of tectonically independent regions. We will then apply the QEC to quantify the subsidence history of various parts of the West Siberian Basin. Motivation to conduct this proposed study stems from the following: -- No basin-scale sequence stratigraphic analysis of West Siberia has ever been performed, although copious stratigraphic information has already been accumulated. -- The depositional history of West Siberia is not well understood because most previous investigations have been focused on local petroleum exploration. -- Basin subsidence has not been well constrained because it has been impossible to separate the eustatic signal from basin stratigraphy. -- The recently developed Quantified Eustatic Curve (QEC) based on Russian Platform stratigraphy must be tested on tectonically independent basins before it can be used as a globally applicable tool. West Siberia provides an ideal test case because of its well-established biostratigraphic correlation with the Russian Platform. -- It will be possible to use the newly constructed Quantified Eustatic Curve to filter the eustatic signal from tectonic and sedimentary factors for any basin, once it has been tested. -- No quantified eustatic input has been available for synthetic stratigraphic models. Inclusion of the Quantified Eustatic Curve will enhance their applicability to basin analysis. Our plan of attack includes: -- Data Compilation -- Sequence stratigraphic analysis -- Backstripping and construction of relative sea-level curves -- Further testing of the Quantified Eustatic Curve -- Application of eustatic cu rve to basin stratigraphy and determination of subsidence history -- Utilization of synthetic stratigraphic simulations to fine-tune parameters and test system sensitivity to parameter uncertainties. We will first compile a database including geophysical, lithostratigraphic, and paleontologic information from published literature and unpublished data housed in Siberian Institutes. We will then apply sequence stratigraphic techniques to selected regions in West Siberia in order to develop a consistent model of basin stratigraphy and depositional history. The next part of the proposed project involves construction of local relative sea-level curves by backstripping individual points in the stratigraphic database. Our previously constructed Quantified Eustatic Curve will be tested and then applied to the local relative sea-level curves, making it possible to quantify the subsidence and sedimentation histories of the different parts of the basin. Finally, we will construct synthetic stratigraphy of West Siberia using standard modelling packages. The results of the project will be significant on local and global scales in that the project will: -- include the first basin-scale sequence stratigraphic analysis of West Siberia (basin-scale), thus providing a better understanding of its depositional history. -- reconcile the differences between presently existing, parochial depositional models. -- produce a quantified history of basin subsidence more reliably than previously possible. -- provide a test of the applicability of the recently constructed Quantified Eustatic Curve for filtering the eustatic signal from basin stratigraphy. -- be the first use of the Quantified Eustatic Curve in synthetic stratigraphic computer models.