The exhumed hydrocarbon traps of East Greenland provide a superb opportunity to study the evolution of fluid flow in the petroleum systems of the North Atlantic. Following basin inversion during the Cenozoic these structures were exhumed and deeply incised which has allowed them to be observed and mapped in great detail. This study examines the diagenetic history of the Mols Bjerge and Laplace Bjerg exhumed hydrocarbon traps, from the initial charge of Triassic and Jurassic reservoirs, to their eventual uplift and destruction. Detailed petrographic analysis was undertaken on 67 samples collected at representative intervals throughout the structures. Variations in the distribution of diagenetic phases and remnant porosity were investigated. Twenty three samples were also subjected to helium porosity measurement. Bitumen, up to 18%, was recognised in 34 samples, 6 of which were analysed for their form and reflectance. Fluid inclusion data, collected from the nearby Bjørnedal region, helps to constrain the thermal history of the region. Helium porosity and permeability measurements are low, largely below 10% and 2 mD respectively. However, the abundance of bitumen highlights the presence of significantly higher porosity and permeability during hydrocarbon charge. A synthesis of fluid inclusion data and bitumen reflectance, alongside a detailed examination of the paragenetic sequence, demonstrate that hydrocarbon charge occurred in the Eocene, during maximum burial, at which time only a minor reduction in original intergranular porosities had taken place. The destruction of the pore systems occurred due to the degradation of hydrocarbons to bitumen, resulting from heat flow during intrusive events, and subsequent carbonate and limonite cementation during uplift. The original source of the hydrocarbons is unclear. This work highlights that where unaffected by intrusives and uplift, the largely untested Triassic play may still contain viable reservoir intervals at depth on the Norwegian Continental Shelf.

中文翻译：

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东格陵兰岛碳氢化合物捕集的生与死：Laplace Bjerg 和 Mols Bjerge 的电荷和降解历史


东格陵兰岛挖掘的碳氢化合物圈闭为研究北大西洋石油系统中流体流动的演变提供了绝佳的机会。在新生代盆地倒置后，这些结构被挖掘出来并深切开，这使得它们可以被非常详细地观察和绘制。本研究考察了 Mols Bjerge 和 Laplace Bjerg 挖掘的碳氢化合物圈闭的成岩历史，从三叠纪和侏罗纪储层的初始充注到最终的隆起和破坏。对在整个结构中以代表性间隔收集的 67 个样品进行了详细的岩相分析。研究了成岩相分布和残余孔隙度的变化。还对 23 个样品进行了氦气孔隙率测量。在 34 个样品中识别出高达 18% 的沥青，其中 6 个样品的形态和反射率进行了分析。从附近的 Bjørnedal 地区收集的流体包裹体数据有助于限制该地区的热历史。氦气孔隙率和渗透率测量值很低，分别远低于 10% 和 2 mD。然而，沥青的丰富性凸显了在碳氢化合物充注过程中存在明显更高的孔隙率和渗透性。流体夹杂物数据和沥青反射率的综合，以及对共生序列的详细检查，表明碳氢化合物电荷发生在始新世，在最大埋藏期间，此时原始晶间孔隙度仅略有减少。孔隙系统的破坏是由于侵入事件期间的热流导致碳氢化合物降解为沥青，随后在隆起过程中碳酸盐和褐铁矿胶结。 碳氢化合物的原始来源尚不清楚。这项工作强调，在不受侵入和隆起影响的地方，基本上未经测试的三叠纪储层在挪威大陆架的深处可能仍包含可行的储层层段。