Hydrocarbon exploration onshore Denmark has been unsuccessful with no commercial discoveries. Several potential plays have been identified of which the Zechstein carbonate play relying on organic-rich Zechstein (Z2) carbonates as source rock is considered the most promising. Additional source rocks might be lower Carboniferous calcareous and carbonaceous units. This study aims at documenting Palaeozoic source rock(s) in the Upper Mississippian/Lower Pennsylvanian and Zechstein Z2 cored sections in wells drilled in the northern margin of the Southern Permian Basin in the Danish Baltic Sea area. The source rock potential, organic matter composition, and thermal maturity was examined using Rock-Eval pyrolysis, vitrinite reflectance measurements, and organic petrography of cuttings and core samples from two wells. In addition, a fluid inclusion reconnaissance study was conducted on samples from four wells. The examined Upper Mississippian/Lower Pennsylvanian marine calcareous mudstones are thermally immature to marginally mature with a generally low TOC content consisting of minor amounts of dispersed vitrinite and inertinite and scattered yellowish fluorescing mainly terrigenous liptinite macerals. The source rock potential is nil to poor. The analysed Zechstein Z2 section is also thermally immature and consists of resedimented carbonate mudstones deposited in a marine environment on a slope. The mudstones are organic-lean with identifiable tiny vitrinite particles and some telalginite. The source rock quality is poor with a potential for some gas generation. Thus, identification of rich source rocks failed, but the occurrence of solid bitumen in the Zechstein Z2 suggests the presence of restricted source rock levels in the mudstones or migration from deeper richer source rock sections. Further, hydrocarbon fluid inclusions are direct evidence for petroleum generation and migration. The dark appearance, high vapour/liquid ratio at room temperature and their homogenisation behaviour clearly indicate a mixed hydrocarbon composition with methane and higher hydrocarbons, like gas condensate. This demonstrates the presence of a working petroleum system in the northern margin of the Southern Permian Basin in southern Denmark.

丹麦陆上油气勘探一直不成功，没有商业发现。已经确定了几个潜在的成藏区，其中依赖富含有机物的 Zechstein (Z2) 碳酸盐作为烃源岩的 Zechstein 碳酸盐岩层被认为是最有前景的。其他烃源岩可能是较低的石炭纪钙质和碳质单元。本研究旨在记录在丹麦波罗的海地区南二叠纪盆地北缘钻探的井中上密西西比/下宾夕法尼亚和 Zechstein Z2 取芯部分的古生代烃源岩。使用 Rock-Eval 热解、镜质体反射率测量以及来自两口井的岩屑和岩心样品的有机岩相学检查了烃源岩潜力、有机质组成和热成熟度。此外，对四口井的样品进行了流体包裹体勘察研究。所检查的上密西西比/下宾夕法尼亚海相钙质泥岩热不成熟到边缘成熟，TOC 含量普遍较低，由少量分散的镜质体和惰性物质和分散的淡黄色荧光主要是陆源的钙镁质矿物组成。烃源岩潜力为零至差。分析的 Zechstein Z2 剖面也是热不成熟的，由沉积在斜坡上的海洋环境中的再沉积碳酸盐泥岩组成。泥岩是贫有机物，具有可识别的微小镜质体颗粒和一些telalginite。烃源岩质量差，有一定的产气潜力。因此，丰富烃源岩的识别失败，但 Zechstein Z2 中固体沥青的出现表明泥岩中存在受限的烃源岩水平或来自更深更丰富的烃源岩段的迁移。此外，烃流体包裹体是石油生成和运移的直接证据。深色外观、室温下的高汽/液比及其均化行为清楚地表明混合烃组合物与甲烷和高级烃，如凝析油。这表明在丹麦南部的南二叠纪盆地北缘存在一个工作石油系统。深色外观、室温下的高汽/液比及其均化行为清楚地表明混合烃组合物与甲烷和高级烃，如凝析油。这表明在丹麦南部的南二叠纪盆地北缘存在一个工作石油系统。深色外观、室温下的高汽/液比及其均化行为清楚地表明混合烃组合物与甲烷和高级烃，如凝析油。这表明在丹麦南部的南二叠纪盆地北缘存在一个工作石油系统。