Sequence stratigraphy and palaeogeography of the Upper Jurassic and Lower Cretaceous in the Eastern Barents Sea,Basin Research

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Sequence stratigraphy and palaeogeography of the Upper Jurassic and Lower Cretaceous in the Eastern Barents Sea
Basin Research ( IF 2.8 ) Pub Date : 2024-04-04 , DOI: 10.1111/bre.12862
Alina V. Mordasova ₁ , Antonina V. Stoupakova ₁ , Anna A. Suslova ₁ , Alejandro V. Escalona ₂ , Dora Marín ₃ , Albina Gilmullina ₄

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The Upper Jurassic–Lower Cretaceous sedimentary rocks in the Eastern Barents Sea Basin are up to 2 km thick and represent one of the least studied Arctic intervals. Here, for the first time, we present a detailed analysis of 43,000 km of 2D seismic profiles, as well as well‐log and core data from 24 offshore wells with the aim to create a comprehensive sequence stratigraphic framework that can be integrated with the rest of the basin. Results show that (1) seven third‐order sequences and five types of clinoforms can be identified based on integrated seismic and well data. The age of each sequence was established based on published biostratigraphic investigations along with new dinocyst interpretations included in this study; (2) the deep marine basin was gradually filled with sediments coming from north, east and south as a response to HALIP, Canada Basin opening and Cimmerian uplift of Novaya Zemlya, and was preserved only in the south‐western part of the Barents Sea Basin at the end of Early Cretaceous and (3) both Eastern Barents Sea and West Siberia Basin share similarities in sedimentary environments and tectonic setting, though the spatial distribution of clastic reservoirs in Upper Jurassic and Lower Cretaceous mega‐sequence heavily depends on the source areas that require more provenance focused research. The results presented here can be used in further regional exploration in the area and to better understand the geodynamic evolution of the Greater Barents Sea Basin.

中文翻译：

东巴伦支海上侏罗统和下白垩统层序地层学和古地理

东巴伦支海盆地的上侏罗统-下白垩统沉积岩厚达 2 公里，是研究最少的北极层段之一。在这里，我们首次对 43,000 公里的二维地震剖面以及来自 24 口海上井的测井和岩心数据进行了详细分析，旨在创建一个可以与其他部分集成的综合层序地层框架。盆地的。结果表明：（1）基于地震和井数据的综合，可以识别7个三级层序和5种类型的斜面。每个序列的年龄是根据已发表的生物地层调查以及本研究中包含的新恐龙囊解释确定的； (2) 由于HALIP、加拿大盆地开口和新地岛西梅里亚隆起的影响，深海盆地逐渐被来自北、东、南的沉积物充填，仅在巴伦支海盆地西南部得以保存(3) 早白垩世末期和(3)东巴伦支海和西西伯利亚盆地在沉积环境和构造背景上具有相似性，但上侏罗统和下白垩统巨型层序碎屑岩储层的空间分布很大程度上取决于其物源区。需要更多以来源为重点的研究。这里提出的结果可用于该地区的进一步区域勘探，并更好地了解大巴伦支海盆地的地球动力学演化。

更新日期：2024-04-04

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