Abstract Sequence stratigraphy is commonly used to understand basin history and the distribution of conventional reservoir facies. Establishing a sequence stratigraphic framework in organic-rich mudstone successions is challenging because macroscale sedimentological and petrophysical variations can be subtle, while biostratigraphic and seismic data may be unavailable or of limited use. For these reasons, it is becoming increasingly common for chemostratigraphic profiles to be integrated with other datasets to facilitate sequence stratigraphic interpretation. This paper summarizes the whole-rock inorganic geochemical proxies relevant to sequence stratigraphic analysis in fine-grained, organic-rich marine units and reviews studies that have incorporated chemostratigraphic trends for sequence stratigraphy. This synthesis demonstrates that chemostratigraphic datasets are useful in identification of transgressive-regressive cycles, allowing for a preliminary summary of the chemostratigraphic characteristics of the maximum flooding surface, maximum regressive surface, transgressive systems tract, and regressive systems tract to be established based on existing work. A preliminary synthesis of the chemostratigraphic characteristics of the highstand systems tract is also possible for highstand systems tracts recognized using other criteria. However, a chemostratigraphic means of identifying the correlative conformity and basal surface of forced regression in order to subdivide the regressive systems tract into the lowstand systems tract, falling-stage systems tract, and highstand systems has not yet been demonstrated. Further work is also required in order to establish the differences in the chemostratigraphic signature of surfaces and systems tract depending on the depositional setting. Chemostratigraphic proxies are an emergent and promising tool for the identification of cyclicity in organic-rich mudstone intervals, which will become increasingly useful as further research is conducted on the topic.

中文翻译：

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使用化学地层数据集的富含有机质海相泥岩层序地层学

摘要 层序地层学常用于了解盆地历史和常规储层相分布。在富含有机质泥岩序列中建立层序地层框架具有挑战性，因为宏观沉积学和岩石物理变化可能是微妙的，而生物地层和地震数据可能不可用或用途有限。由于这些原因，将化学地层剖面与其他数据集整合以促进层序地层解释变得越来越普遍。本文总结了与细粒、富含有机质海相单元中的层序地层分析相关的全岩无机地球化学指标，并回顾了纳入层序地层学化学地层趋势的研究。该综合表明化学地层数据集可用于识别海进-回归旋回，从而可以初步总结最大洪水面、最大海退面、海进系统域和海退系统域的化学地层特征，以根据现有工作建立. 对于使用其他标准识别的高位系统域，也可以初步综合高位系统域的化学地层特征。然而，为了将回归系统域细分为低水位系统域、下降阶段系统域和高水位系统，识别相关整合和强制回归的基底表面的化学地层学方法尚未得到证实。还需要进一步的工作来确定表面和系统域化学地层特征的差异，这取决于沉积环境。化学地层代理是识别富含有机质泥岩层段中旋回性的新兴且有前途的工具，随着对该主题的进一步研究，它将变得越来越有用。