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

小行星9614752 我们建议通过对侏罗纪-新科米亚纪剖面的层序地层学分析，建立一个自洽的西西伯利亚盆地沉积模式。 现有的地层模型导致了盆地地层学的不一致。 我们还建议通过与构造独立区域的地层进行比较来测试我们以前研究中开发的量化海平面变化曲线（QEC）的有效性。 然后，我们将应用QEC来量化西西伯利亚盆地各个部分的沉降历史。 进行这项研究的动机源于以下几点：--虽然已经积累了丰富的地层信息，但从未对西西伯利亚进行过盆地规模的层序地层分析。 --西西伯利亚的沉积历史并不清楚，因为以前的大多数调查都集中在当地的石油勘探上。 --盆地沉降没有得到很好的限制，因为不可能从盆地地层中分离出海平面变化信号。 --最近根据俄罗斯地台地层学开发的量化海平面变化曲线（QEC）必须在构造独立的盆地中进行测试，然后才能作为全球适用的工具。 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。 --一旦经过测试，就有可能使用新建立的量化海平面变化曲线来过滤任何盆地的构造和沉积因素的海平面变化信号。 --合成地层模型没有可量化的海平面变化输入。 包括量化的海平面曲线将提高其适用于盆地分析。 我们的攻击计划包括：--数据汇编--层序地层分析--相对海平面曲线的回剥和构建--定量海平面曲线的进一步测试--海平面曲线在盆地地层学中的应用和沉降历史的确定--利用综合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。 我们将首先编译一个数据库，包括地球物理，岩石地层学，和古生物学信息，从已发表的文献和未发表的数据存放在西伯利亚研究所。 然后，我们将应用层序地层学技术在西西伯利亚选定的地区，以开发一个一致的盆地地层和沉积历史的模型。 拟议项目的下一部分涉及通过回剥地层数据库中的各个点来构建当地相对海平面曲线。 我们以前构建的量化海平面曲线将进行测试，然后应用到当地的相对海平面曲线，使之有可能量化的沉降和沉积历史的不同部分的盆地。 最后，我们将使用标准建模包构建西西伯利亚的综合地层学。 该项目的成果将在地方和全球范围内具有重要意义，因为该项目将：-包括西西伯利亚第一次盆地规模的层序地层分析（盆地规模），从而更好地了解其沉积历史。 --调和现有的、狭隘的沉积模式之间的差异。 --比以前更可靠地产生盆地沉降的量化历史。 --对最近建立的量化海平面曲线用于过滤来自盆地地层学的海平面变化信号的适用性进行了测试。 --首次在综合地层计算机模型中使用量化海平面变化曲线。

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.