The Influence of Salt Tectonics on the Distribution of the Triassic Skagerrak Formation in the Ula Field, Norwegian North Sea

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
L. Di Lauro, A. Hartley, J. Duncan, E. Rosseland Knutsen, J. Howell, D. Jolley
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Abstract

Distribution of the Triassic succession in the North Sea is poorly understood because of structural complexities associated with halokinesis and limited stratigraphic control. This study uses a seismic and well based dataset to improve understanding of development of the Triassic succession in the Ula Field Area, of the Norwegian North Sea. Core interpretation revealed a fluvial-dominated depositional environment in the Ula Field Area. Palynological studies allowed dating of cored intervals, revealing Ladinian and Carnian sections, time-equivalent to the Julius and Joanne members of the Skagerrak Formation. Well-log interpretation provided insight into the intra-Triassic stratigraphy of the Ula Field Area. A section considered to be equivalent to and extending from the Smith Bank Formation to the Jonathan Member of the Skagerrak Formation was interpreted and correlated across the area. In the proposed correlation, the Julius Member thins towards the Ula Field Area and is replaced by a time equivalent sandstone unit. The Jonathan Member displays a sandier composition compared to the equivalent section in the UK sector. Seismic facies-based interpretation of Triassic stratigraphy within salt minibasins allowed recognition and mapping of intra-Triassic units and showed that mudstone members thin towards the northeast. Interpreted internal geometries within minibasins allowed determination of the timing of halokinesis. Integration of different datasets allowed palaeogeographic reconstructions for the Anisian, early Ladinian, Carnian and Norian to be constructed. To conclude, the distribution of stacked fluvial channel deposits indicates that they occur both within minibasins and across salt highs such that ongoing halokinesis had no topographic expression and that channels were free to migrate across the area.
盐构造对挪威北海乌拉油田三叠纪斯卡格拉克地层分布的影响
北海三叠纪演替的分布情况不甚明了,原因是与晕动有关的构造复杂性和有限的地层控制。本研究利用地震和油井数据集,加深了对挪威北海乌拉油田区三叠系演替发展的了解。岩心解释揭示了乌拉油田区以河流为主的沉积环境。古植物学研究确定了岩心层段的年代,揭示了与斯卡格拉克地层朱利叶斯层和乔安层时间相当的拉迪尼安层和卡尼安层。井记录解释使人们对乌拉油田区的三叠纪地层有了更深入的了解。对整个地区的一个被认为与史密斯河滩地层相当并从史密斯河滩地层延伸至斯卡格拉克地层乔纳森层的地段进行了解释和相关性分析。在拟议的相关性中,朱利叶斯层向乌拉油田区变薄,被时间相当的砂岩单元所取代。与英国地区的等效剖面相比,乔纳森岩层的砂岩成分较多。通过对盐矿小盆地内的三叠纪地层进行基于地震剖面的解释,可以识别和绘制三叠纪内的单元,并显示泥岩成员向东北方向变薄。通过对小盆地内部几何形状的解释,可以确定卤化的时间。通过整合不同的数据集,构建了安尼西纪、拉迪尼纪早期、卡尼安纪和北安纪的古地理重建。总之,堆积河道沉积物的分布表明,这些沉积物既出现在小盆地内,也出现在跨盐高地的地方,因此正在进行的半地壳运动没有地形表达,河道可以在该地区自由迁移。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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