Structural elements and petroleum geology of the Norwegian sector of the northern Barents Sea
Structural elements and petroleum geology of the Norwegian sector of the northern Barents Sea
复制标题
巴伦支海北部挪威区的结构要素和石油地质
作者：
P. Grogan;A.;G. B. Larssen;B. Fotland;K. Nyberg;S. Dahlgren;T. Eidvin
巴伦支海北部被划分为两个主要的油气远景区：(1)斯瓦尔巴群岛南部和东部台地区可能存在上古生界碎屑岩、碳酸盐岩和中生代砂岩；(2)巴伦支海边缘包括耶尔马克高原，可能发育晚中生代和第三纪砂岩。台地区下部为古生代高位裂谷系和中间盆地，泥盆系和早石炭世的岩石被相对平坦的晚古生代和中生代层序覆盖。巴伦支海边缘是一个复杂的盆地省，是晚中生代和新生代泛古大陆分裂和斯匹次卑尔根岛以西海底扩张的产物。巴伦支海北部尚未开放商业勘探，在近海地区也没有钻探深井。它是西欧最大的边疆地区之一，因此提供了广泛的勘探机会。然而，该地区被认为是石油勘探的高风险地区，总体上发现的统计概率很低，主要是因为可用于评估潜在油气油气藏的数据数量有限，特别是烃源岩的存在、分布、质量和成熟度。因此，油气资源估计具有很大的不确定性。在sentralbken High、Kong Karls陆台、Gardarbanken High以及Bjornoya西北部的中生代和第三纪次盆地，发现了许多构造和地层线索。未来的挑战将集中在减少测绘合适质量烃源岩分布的不确定性上。有限的盆地模拟研究表明，石油可能在许多省份产生和聚集，但需要更好的约束模型来评估早白垩世的热事件和晚新生代的隆升过程，这些过程可能对生油和圈闭中碳氢化合物的保留产生负面影响。
The northern Barents Sea is divided into two principal prospective provinces: (1) the platform areas south and east of Svalbard contain possible hydrocarbon plays in Upper Palaeozoic clastics and carbonates, and in Mesozoic sandstones; (2) The Barents Sea margin, which includes the Yermak Plateau, with possible plays in late Mesozoic and Tertiary sandstones. The platform areas are underlain by a Palaeozoic rift system of highs and intervening basins, containing Devonian and Early Carboniferous rocks overlain by relatively flat-lying sequences of Late Palaeozoic and Mesozoic age. The Barents Sea margin is a complex basin province formed in response to phases of the Late Mesozoic and Cenozoic break-up of the Pangea supercontinent, and subsequent seafloor spreading west of Spitsbergen. The northern Barents Sea is as yet not open for commercial exploration, and no deep wells have been drilled in the offshore areas. It is one of the largest remaining frontier areas in western Europe and as such affords a wide range of exploration opportunities. However, the area is considered to be of high risk for petroleum exploration, with generally low statistical probabilities of discovery, largely because of the limited amount of data available to evaluate potential hydrocarbon plays, and in particular the presence, distribution, quality and maturity of source rocks. Hydrocarbon resource estimates are therefore characterized by large uncertainties. Potential reservoir rocks are identified, and seismic mapping has revealed many structural and stratigraphic leads on the Sentralbanken High, the Kong Karls Land Platform, the Gardarbanken High and in the Mesozoic and Tertiary sub-basins northwest of Bjornoya. Future challenges will be focused on reducing uncertainties in mapping the distribution of source rocks of suitable quality. Limited basin modelling studies indicate that oil may have been generated and accumulated in many provinces, but better constrained models are required to evaluate Early Cretaceous thermal events and Late Cenozoic uplift processes that may have had negative effects on both oil generation and the retention of hydrocarbons in traps.