Abstract
The marine, mudstone-dominated Hareelv Formation (Upper Jurassic) of Jameson Land, East Greenland is a representative of the widespread Kimmeridge Clay Formation equivalents, sensu lato, known from the greater North Atlantic region, western Siberia and basins off eastern Canada. These deposits constitute the most important petroleum source-rock succession of the region. The present study reports petroleum geochemical data from the 233.8 m thick succession penetrated by the fully cored Blokelv-1 borehole, and includes supplementary data from outcrop samples and other boreholes in Jameson Land. The succession consists of basinal mudstone intercalated with a significant proportion of gravity-flow sandstones, both in situ and remobilised as injectites. The mudstones are generally rich in organic carbon with values of TOC reaching nearly 19 wt% and high pyrolysis yields reaching values of S2 up to nearly 43 kg HC/ton. Hydrogen Indices are up to 363. The data presented herein demonstrate that weathering of abundant pyritic sulfur adversely affects the petroleum potential of the kerogen in outcrop samples. The succession is thermally immature to early mature, except where intrusions have locally heated adjacent mudstones. The documentation of rich gas/oil-prone Upper Jurassic successions in Jameson Land is important for the assessment of the regional petroleum potential, including the North-East Greenland continental shelf.
Highlights
The marine, mudstone-dominated Hareelv Formation (Upper Jurassic) of Jameson Land, East Greenland is a representative of the widespread Kimmeridge Clay Formation equivalents, sensu lato, known from the greater North Atlantic region, western Siberia and basins off eastern Canada
The objective of this paper is to present a comprehensive overview of the petroleum potential of the Upper Jurassic – Lower Cretaceous shale succession in Jameson Land, based on new evidence from the Blokelv-1 core, while including other available data from both outcrops and earlier shallow, fully cored boreholes drilled in Jameson Land (Fig. 1)
The Hareelv Formation is commonly poorly exposed (Fig. 4), but outcrops were sampled at a number of different locations, several situated close to borehole drill sites (Fig. 1, Table 1); samples were primarily collected from the older, Oxfordian–Kimmeridgian, parts of the succession
Summary
The marine, mudstone-dominated Hareelv Formation (Upper Jurassic) of Jameson Land, East Greenland is a representative of the widespread Kimmeridge Clay Formation equivalents, sensu lato, known from the greater North Atlantic region, western Siberia and basins off eastern Canada. These deposits constitute the most important petroleum source-rock succession of the region. Oxfordian–Ryazanian marine shales form the most important petroleum source rocks of the prospective basins of the North Atlantic region These include the basins of the greater North Sea area, the Barents Shelf, the basins west of Ireland and the Shetland Islands, the Jeanne d’Arc and Flemish Pass basins off eastern Canada as well as the basins of western Siberia, and probably the hitherto untested basins off East and North-East Greenland. Inset shows the location of southern Jameson Land in East
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