On the island of Hopen, in the Svalbard Archipelago, the Svenskoya Formation is a succession 35 m in thickness, consisting primarily of sandstone beds and forming the youngest strata exposed on the island. We present a sedimentological and petrographic study of the formation and compare the unit with its exposures on Wilhelmoya and in Kong Karls Land, Svalbard. We also compare the onshore characteristics of the Svenskoya Formation with those of the Tubaen Formation, its time-equivalent unit in the Sentralbanken area of the northern Barents Sea. On Hopen, the Svenskoya Formation is interpreted as representing coarse clastic sediments deposited in a fluvial to tidal setting, prior to being overlain by a thin interval composed of tidal channel and marine shale deposits. The unit sits atop the regional “Rhaetian Unconformity” and represents sediments deposited during a regressive system that terminates at a flooding surface representing a local transgression of the palaeo-coastline. Petrographic studies show the formation as being arkosic, both on Hopen and in the Sentralbanken area. The reservoir quality of sandstone samples recovered from Hopen is somewhat lower compared to sandstone reservoirs in the Sentralbanken area. We attribute this to greater effects of diagenesis in the Hopen area, which caused increased compaction, mineral dissolution and extensive precipitation of pore-filling clay minerals.

中文翻译：

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斯瓦尔巴群岛 Hopen 上 Svenskøya 组的沉积学和岩石学：类似于 Realgrunnen 亚群中的砂岩储层

在斯瓦尔巴群岛的 Hopen 岛上，Svenskoya 组是一个连续的 35 m，主要由砂岩层组成，是岛上出露的最年轻的地层。我们对地层进行了沉积学和岩石学研究，并将该单元与其在 Wilhelmoya 和斯瓦尔巴群岛 Kong Karls Land 的暴露进行了比较。我们还将 Svenskoya 组的陆上特征与 Tubaen 组的陆上特征进行了比较，Tubaen 组是巴伦支海北部 Sentralbanken 地区的时间等效单元。在霍本，Svenskoya 组被解释为代表沉积在河流到潮汐环境中的粗碎屑沉积物，然后被潮汐通道和海相页岩沉积物组成的薄层覆盖。该单元位于区域“Rhaetian 不整合面”之上，代表在回归系统期间沉积的沉积物，该系统终止于代表古海岸线局部海侵的洪水面。岩石学研究表明，在 Hopen 和 Sentralbanken 地区，该地层都是长石质的。与 Sentralbanken 地区的砂岩储层相比，从 Hopen 回收的砂岩样品的储层质量略低。我们将此归因于 Hopen 地区成岩作用的更大影响，这导致了更多的压实、矿物溶解和孔隙填充粘土矿物的广泛沉淀。在 Hopen 和 Sentralbanken 地区。与 Sentralbanken 地区的砂岩储层相比，从 Hopen 回收的砂岩样品的储层质量略低。我们将此归因于 Hopen 地区成岩作用的更大影响，这导致了更多的压实、矿物溶解和孔隙填充粘土矿物的广泛沉淀。在 Hopen 和 Sentralbanken 地区。与 Sentralbanken 地区的砂岩储层相比，从 Hopen 回收的砂岩样品的储层质量略低。我们将此归因于 Hopen 地区成岩作用的更大影响，这导致了更多的压实、矿物溶解和孔隙填充粘土矿物的广泛沉淀。