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Shallow Core Drilling and Petroleum Geology Related Field Work in East and North-East Greenland 2008

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Shallow Core Drilling and Petroleum Geology Related Field Work in East and North-East Greenland 2008 ROSA_2008:ROSA-2008 01/07/09 15:48 Side 53 Shallow core drilling and petroleum geology related field work in East and North-East Greenland 2008 Jørgen A. Bojesen-Koefoed, Morten Bjerager and Stefan Piasecki In recent years, both the petroleum industry and government 22°W 20°W 18°W 16°W research institutions have shown renewed interest in the Danmarkshavn Basin petroleum potential of the High Arctic. At the same time, a NDSP Store Koldewey range of activities are taking place, aimed at defining national 76°N borders in the Arctic Ocean following ratification of article Greenland 76 of the United Nations Convention on the Law of the Sea (UNCLOS). Parallel to the general upsurge in data acquisi- Hochstetter Forland tion activities, the United States Geological Survey has car- DF ried out a Circum-Arctic Resource Appraisal (CARA), which for North-East Greenland was published in 2007. This 24°W Kuhn Ø assessment indicated that a significant petroleum exploration NDSP: North Danmarkshavn Brorson Halvø Salt Province Th.Thomsen potential exists on the North-East Greenland shelf, in partic- Land 26°W Rødryggen ular in the Danmarkshavn Basin and the North Danmarks - C C' Tertiary Wollaston havn Salt Province (Fig. 1). The estimated potential amounts Forland Cretaceous Clavering Daneborg Ø 74°N to 31 billion barrels of oil equivalents, principally in the form Jurassic Gael Hamke Bugt of natural gas. For comparison, this roughly corresponds to Triassic d Permian n Home Forland one third of the original reserve of the North Sea basins. The La n Hold with Fault PDMF dso Hope geology of the Danmarkshavn Basin and offshore areas far- u Gauss H Buried deep- Halvø ther to the north is only known in broad outline, since no seated faults Kejser Franz Joseph Fjord wells have been drilled and only reconnaissance geophysical Stauning SAF data are available. Moreover, the extensive ice cover and the Alper Fault Ymer Ø Post-Devonian overall hostile climate of the region pose significant logistical PDMF Geographical Main Fault Society Ø and technical challenges to data acquisition. Clearly, this Dombjerg DF emphasises the importance of analogue studies based on the Fault Traill Ø much better known geology of the onshore basins in East and Liverpool Land Kong Osc LLE a Escarpment r Fjor 72°N North-East Greenland. In 2007/2008, the Geological Survey Mestersvig d Drill site near of Denmark and Greenland (GEUS) launched a major petro- Blokelv leum industry-sponsored project with the objective of updat- SAF Schuchert Dal Carlsberg Fjord ing and expanding our current understanding of the petro - B' LLE leum geology of East and North-East Greenland. The project Jameson is planned to continue for the next four to five years, and A Land A' includes compilation of relevant existing data in the form of Ugleelv a geographic information system (GIS) product, supple- Fortet Milne Land Constable Hall Pynt Bredning mented by new data obtained from shallow core drilling and Liverpool Hurry Inlet Land new field work. Below we give a brief overview of a range of Scoresby Sund field activities that took place in East and North-East Green - 70°N land in the summer of 2008. yst Blosseville K 100 km Kap Shallow core drilling in Jameson Land 28°W 26°W Dalton The objective of the drilling was to recover core material from Fig. 1. Map of East and North-East Greenland, showing the distribution of the Upper Jurassic organic-rich shale of the Katedralen Permian to Neogene sedimentary rocks and the location of place names Member (Hareelv Formation) to obtain a reference section of mentioned in the text. NDSP: North Danmarkshavn Salt Basin. © GEUS, 2009. Geological Survey of Denmark and Greenland Bulletin 17, 53–56. Available at: www.geus.dk/publications/bull 53 ROSA_2008:ROSA-2008 01/07/09 15:48 Side 54 Fig. 2. Chrono- and lithostratigraphy of the Chronostratigraphy Age Jameson Land Middle and Upper Jurassic in Jameson Land. (Ma) Stage SNModified from Surlyk (2003). Berriasian U Low. Cret. M Volgian Raukelv Fm Tithonian L Studies of the new cores from the m 150 Sjællandselv Mb Katedralen Member focus on the U Kimmeridgian stratigraphy and age of the Hareelv Upper No data L F Hareelv rassic Katedralen Mb Formation and lateral, contemporane- u J U Oxfordian ous deposits (Fig. 2). The lower bound- M Zeus Mb L Hades Mb ary of the Katedralen Member is well 160 Athene Mb U known from the Ugleelv region and the Callovian M Goniomyakløft Mb Middle L Fossilbjerget Fm west side of Hurry Inlet, where few, Condensed Parnas Mb condensed beds of mudstone and fine- Shallow marine sandstones Hiatus/condensed grained sandstone separate the Fossil - Shelf transition-zone siltstones/heteroliths Mass flow sandstone bjerget and Hareelv Formations. These Marine shelf/basinal mudstones Source rock beds are age equivalent to the Olympen Deep marine sandstones Formation in central to northern Jame - the most prolific source rock in the north Atlantic region son Land (P. athleta to C. densiplicatum Chronozones of Late (Fig. 2). The deepest and most central part of the Jameson Callovian to Middle Oxfordian age; Larsen & Surlyk 2003). Land Basin at Blokelv approximately 35 km west of Con - The deposition of laminated mudstone of the Katedralen stable Pynt was chosen as the drill site (Fig. 1). Member began in the Late Oxfordian. The continued sedi- The Blokelv drilling (Fig. 3) produced high quality cores mentation of the Katedralen Member mud reaches into the (GGU 511101) with a diameter of 5.6 cm and 99.3% recov- Kimmeridgian and Volgian especially in eastern and southern ery to a depth of 233.8 m (Fig. 4). The top part from 1.72 to Jameson Land (Fig. 2). During the Volgian, the coarse- 10.08 m recovered homogeneous medium to fine-grained grained sand of the Sjællandselv Member and Raukelv For - sandstone with two thin shale intervals of the Sjællandselv mation was deposited in the western and central parts of the Member (Hareelv Formation). The Katedralen Member (Hare - Jameson Land Basin at the same time as the Katedralen elv Formation) from 10.08 to 233.8 m consists of alternating Member mud was deposited in the easternmost, apparently sandstone and shale units; the lower boundary of the mem- much deeper basin (Surlyk 2003). The youngest parts of the ber was not reached. Katedralen Member are only known from the locality Fortet near Constable Pynt in eastern Jameson Land, where the dinoflagellate assem- blage indicates an age not older than lat- est Middle Volgian (Fig. 2). The upper boundary of the Kate - dralen Member is located where lami- nated mudstone is replaced by homo - geneous sandstone of the Sjæl landselv Member. The sand slumped into the central basin from shelf-edge deltas pro- grading from north-west and west. This shift in deposition can be followed from west to east across the basin in a number of shallow core drillings and exposed Fig 3. Drilling operations near Blokelv in Jameson Land. Three-metre-long cores are drilled at a time, and each time a core is retrieved water is pouring out of the drill hole. 54 ROSA_2008:ROSA-2008 01/07/09 15:48 Side 55 sections. The boundary is strongly diachronous: Kimmerid - gian–Volgian in the west to Middle – Upper Volgian in the Petroleum source rocks and Cretaceous– easternmost part of the basin. Palaeogene stratigraphy An extensive analytical programme to evaluate source and Petroleum source rocks are known to be present in East and reservoir rock properties to establish a high-resolution dino - North-East Greenland in a number of stratigraphic intervals flagellate cyst and macrofossil biostratigraphic zonation, and ranging in age from Middle Devonian to Upper Jurassic, assess sedimentological, diagenetic and sequence stratigra - whereas source rocks in younger units still remain to be phic aspects of the penetrated succession is in progress. demonstrated. Among these various units the Upper Jurassic ‘Kimmeridge Clay equivalents’ referred to as the Hareelv, Kap Leslie and Bernbjerg Formations (Surlyk 2003) must be Field work considered the more important ones with respect to petro- Field work took place by means of helicopter-supported field leum exploration. The documentation of spatial and tempo- teams of 2–4 persons, operating primarily out of field camps. ral variations in petroleum potential within these units is The activities covered a wide range of geological disciplines crucial to the prediction of the distribution of the potential that are briefly described below. Field teams camped at or vis- in the little-known offshore basins. Upper Jurassic shale of ited locations from Kap Dalton on the Blosseville Kyst in the the Bernbjerg Formation was sampled on Hold with Hope south to Kuhn Ø in the north (Fig. 1). and Wollaston Forland, and potential drill sites were found at Rødryggen and Brorson Halvø on Wollaston Forland. In addition, Cretaceous shale was sampled for both stratigraphic Volcanology and geochemical purposes on Wollaston Forland, whereas Volcanic rocks in the form of plateau basalts as well as vari- sampling of Cretaceous deposits and drill-site identification ous intrusions abound in East and North-East Greenland, on Hold with Hope had to be postponed due to the presence and their histories of emplacement and mutual relationships of polar bears in the area. are important elements in the understanding of the regional The stratigraphy and sedimentological development of geology. A field team sampled and studied the youngest vol- the Cretaceous–Palaeogene succession of North-East Green - canic rocks in the region that are preserved in a small graben land have hitherto received relatively little attention, proba- at Kap Dalton. Additional studies were undertaken on Hold bly due to a general assumption that it was deposited during with Hope and Wollaston Forland and on nearby islands east a period of tectonic quiescence with little change in overall and north thereof.
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