The Nalunaq gold prospect, South Greenland - Geus

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70˚W 60°W 50°W 40°W 74°N TGS-NOPEC GREEN 2000 survey line NuussuaqSeis 2000 survey area BMP Baffin Bay survey line Existing KANUMAS line GGU/92-22 and ST9902-01001 74 N Exploration well 2001–2002 licensing round area 200 km Svartenhuk Halvø Border with Canada 70°N Baffin Bay Nuussuaq 70°N Disko Greenland Inland Ice Canada 66°N 62°N Sisimiut-West licence area 60°W Qulleq-1 (6354/4-1) for a train-oil lamp, has also been used by both Statoil and the authorities. The well was drilled with the newly built drill ship West Navion (Fig. 2). It was spudded in 1152 m water depth on 10 July and reached total depth (TD) at 2973 m below rotary table (RT) before it was plugged and abandoned in early September (see well data in Table 1). Although the density of icebergs in the drilling region was higher than expected, downtime due to icebergs K-1 Fylla licence area 50°W 66°N 62°N Fig. 1. Map of West and North-West Greenland showing seismic lines acquired during summer of 2000, licence areas and area covered by 2001–2002 licensing round. K-1: Kangâmiut-1 well. Fig. 2. West Navion drilling off West Greenland in 2000. Photo courtesy of Smedvig asa. in the vicinity of the drill ship was only 33 hours (Ghexis 2000). On the other hand, there was approximately 4 weeks of downtime during the drilling period due to technical problems with the blow out preventer (BOP) and wellhead. The sampling programme during drilling has given some limitations in interpretation of the results of the well, as no cores were taken. Furthermore, cuttings are not available from the uppermost ~ 600 m of the hole, because it was drilled riserless; only minor amounts of material were collected from this interval from the seabed using a remote operated vehicle (ROV). However, an extensive sidewall-core programme has been very important for biostratigraphic studies and also for interpretation of lithology. A total of 120 of 150 sidewall cores were recovered. Due to serious hole problems in the deeper part of the well, logging of the interval below ~ 2205 m could only be carried out during a wiper trip using ‘Measuring While Drilling’ (MWD) tools. Some of the main results from the well are reported briefly below. Biostratigraphical, organic geochemical and petrographical details may be found in consultancy reports produced for the Statoil group (Bojesen-Koefoed et al. 2000; Nøhr-Hansen et al. 2000; Preuss & Dalhoff 2001; Preuss et al. 2001). All depths in the text and figures are in metres below rotary table (RT). 25
m below RT WNW ESE msecs TWT QM 2000 1855 1893 1955 2120 LEoc UPal CCR 2500 2280 UC2 2649 2736 UC1 C–T source rock 3000 2973 3150 LC 3600 3500 LC Basement Fig. 3. Seismic line ST9902-01001 through the Qulleq-1 (6354/4-1) well. See Fig. 1 for position. The gamma-ray log is shown in green to the left of the well and the acoustic impedance log is shown in red to the right. Note that there is no significant change in acoustic impedance at the cross-cutting reflection (CCR) at 2537 msec TWT. LC: ?Lower Cretaceous; UC: Upper Cretaceous; UPal: Upper Paleocene; LEoc: Lower Eocene; QM: Quaternary – Middle Miocene. TWT: Seismic two-way-time. Exploration targets The main target of the Qulleq-1 well was the prominent cross-cutting reflection (CCR) which can be seen on the seismic data at around 2550 msecs two-way travel time (TWT) corresponding to a depth of c. 2100 m (Fig. 3). Extensive analysis of all data available prior to drilling (including amplitude versus offset (AVO) analysis of the seismic data) suggested that this reflection represented a gas–liquid contact in a compartmentalised turbidite sandstone succession (e.g. Bate et al. 1995; Aram 1999; Isaacson & Neff 1999). The well, however, encountered only mudstones in this interval and no gas or oil. At present, the nature of the CCR is not fully understood, but X-ray diffraction analysis of sidewall cores by Statoil suggests that it may be related to a phase-change transition from opal-CT mineralisation to quartz mineralisation. Prior to drilling, TD was planned to 2850 m, just below a strong, regionally developed seismic reflection (~ 3100 msecs, Fig. 3), which was interpreted to be a source rock interval of possible Cenomanian– Turonian age. This reflection turned out to be the contact between Lower Campanian mudstones above and Upper 26
Page 2 and 3: GEOLOGY OF GREENLAND SURVEY BULLETI
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Page 41 and 42: Summary The cruise was very success
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Page 49 and 50: Palaeolimnological investigation of
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Reconnaissance for noble metals in
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Fig. 3. View to the west of ‘Tåg
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A B C 2 cm D Fig. 4. Four hand-spec
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Brooks, C.K. & Gill, C.O. 1982: Com
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I I I I I I I I 40° 32° 24° 16°
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W Miki Fjord opx-bearing lavas Not
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'Lindsay Nunatak' 'N. Polar Bear Nu
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tains 30 x 200 cm cross-bedded sand
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Approximate stratigraphic height (m
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Fig. 9. Southern part of the Kanger
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With the completion of the DLC regi
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Mineralogy and Petrology 128, 45-51
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Kangerlussuaq Nansen Fjord Scoresb
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Fig. 3. Upper Cretaceous marine mud
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Stratigraphy Biostratigraphy Detail
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stratigraphy, lithology, palaeomagn
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▲ ▲ ▲ 27° 21° Inland Ice Gr
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C SC K B C-O Fig. 5. Bastionen seen
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Fig. 6. Vertical cross-section of w
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Special Issue 3, 91-100. Liverpool,
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Table 1. Site locations Site 1 As f
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Fig. 4. Experimental Site 9 origina
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Artic Temperature Trends (1966-1995
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Projects MINEO and HyperGreen: airb
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Table 1. Spatial and spectral chara
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For the HyperGreen project, the kno
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0° 84° 90° 83° 80° 82° 81° 7
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stations are operated. The observat
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The Nalunaq gold prospect, South Greenland - Geus

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