The Permian-Triassic alluvial rift succession in the Horda Platform area is analysed to construct a refined depositional model. The study demonstrates how subsurface continental rift successions may be stratigraphically subdivided and correlated by integrating seismic and well-log data in concert with conceptual models. Regional unconformities mark the top and base of the Permian-Triassic succession, which is sub-divided into six seismic stratigraphic sequences, delineated by erosional- and non-depositional surfaces. The definition of seismic stratigraphic sequences is based on seismic facies trends and Gamma Ray log signatures. Time-thickness maps combined with geometries in cross-section display the depocentre development. During the Permian-Triassic, the Horda Platform experienced faulting, shaping the Caledonian pre-rift landscape into a series of N–S trending half-graben basins, contemporaneous to a gradual climate change from arid in the Permian to humid in the latest Triassic. The basin underwent three phases of rifting during the Late Permian-Middle Triassic: (1) disconnected heterogeneous depocentres with strain concentrated in the west; (2) depocentres expanded northward; and (3) mature half graben development with widely distributed strain. Vertical lithological changes in mudstone/sandstone dominance reflect varying rates of accommodation and sediment supply (A/S). Systematic A/S variation reflects strong climatic fluctuations, which controlled facies patterns during both tectonic quiescence in the Middle-Late Triassic, and during syn-rift sedimentation. The Permian-Triassic tectono-sedimentary development in the Horda Platform area provides valuable lessons on the influence of faulting on depocentre development, how the interplay between tectonic and climatic forcing is expressed in subsurface continental deposits, and aid the characterisation of reservoirs.

中文翻译：

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同裂谷后冲积盆地充填：挪威 Horda 平台二叠纪-三叠纪沉积的地震地层学分析

对霍尔达台地地区二叠系-三叠系冲积裂谷序列进行分析，构建精细的沉积模型。该研究展示了如何通过将地震和测井数据与概念模型相结合，对地下大陆裂谷序列进行地层细分和关联。区域不整合标志着二叠纪-三叠纪序列的顶部和底部，该序列被细分为六个地震地层序列，由侵蚀和非沉积表面划定。地震地层序列的定义基于地震相趋势和伽马射线测井特征。时间-厚度图与横截面的几何形状相结合，显示了沉积中心的发展。在二叠纪-三叠纪期间，霍达平台经历了断层，将加里多尼亚裂谷前景观塑造成一系列南北走向的半地堑盆地，同时气候从二叠纪的干旱逐渐变为三叠纪的湿润。该盆地在晚二叠世—中三叠世经历了三个裂陷期：（1）非均质沉积中心不连贯，应变集中在西部；(2) 集散中心向北扩展；(3)成熟的半地堑发育，菌株分布广泛。泥岩/砂岩优势的垂直岩性变化反映了不同的容纳率和沉积物供应 (A/S)。系统的 A/S 变化反映了强烈的气候波动，这控制了中晚三叠世构造静止期和同裂谷沉积期间的相模式。