Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland
The fully cored Blokelv-1 borehole was drilled through Upper Jurassic strata in the central part of the Jameson Land Basin, central East Greenland. The borehole reached a total depth of 233.8 m with nearly 100% recovery of high-quality core. An extensive analytical programme was undertaken on the co...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Geological Survey of Denmark and Greenland
2018-12-01
|
| Series: | Geological Survey of Denmark and Greenland Bulletin |
| Subjects: | |
| Online Access: | https://eng.geus.dk/media/20465/nr42_p039-064.pdf |
| _version_ | 1818146344271872000 |
|---|---|
| author | Morten Bjerager Claus Kjøller Mette Olivarius Dan Olsen Niels H. Schovsbo |
| author_facet | Morten Bjerager Claus Kjøller Mette Olivarius Dan Olsen Niels H. Schovsbo |
| author_sort | Morten Bjerager |
| collection | DOAJ |
| description | The fully cored Blokelv-1 borehole was drilled through Upper Jurassic strata in the central part of the Jameson Land Basin, central East Greenland. The borehole reached a total depth of 233.8 m with nearly 100% recovery of high-quality core. An extensive analytical programme was undertaken on the core; sedimentological interpretation and reservoir characterisation were based on facies analysis combined with conventional core analysis, bulk geochemistry and spectral gamma and density scanning of the core. The Upper Jurassic Hareelv Formation was deposited in relatively deep water in a slope-to-basin setting where background sedimentation was dominated by suspension settling of organic-rich mud in oxygen-depleted conditions. Low- and high-density gravity-flow sandstone interbeds occur throughout the cored succession. About two-thirds of the high-density turbidite sandstones were remobilised and injected into the surrounding mud-rock. The resulting succession comprises nearly equal amounts of mudstones and sandstones in geometrically complex bodies. Ankerite cementation occurs in 37% of the analysed sandstones in varying amounts from minor to pervasive. Such ankerite-cemented sandstones can be identified by their bulk geochemistry where Ca > 2 wt%, Mg > 1 wt% and C > 1 wt%. The analysed mudstones are rich in Al, Fe, Ti and P and poor in Ca, Mg, Na and Mn. The trace-metal content shows a general increase in the upper part of the core reflecting progressive oxygen depletion at the sea floor. The reservoir properties of the Blokelv-1 sandstones were evaluated by both conventional core analysis and using log-derived porosity and permeability curves. The high-density turbidite beds and injectite bodies are a few centimetres to several metres thick and show large variations in porosity and permeability, in the range of 6–26 % for porosity and 0.05–400 mD for permeability. Individual sandstone units that are 1–7 m thick yield a net vertical reservoir thickness of 40 m with porosities of 15–26% and permeabilities of 1–200 mD. Heterolithic sandstone–mudstone units are generally characterised by poor reservoir quality with porosities of 2–14% and permeabilities of 0.1–0.6 mD. |
| first_indexed | 2024-12-11T12:17:51Z |
| format | Article |
| id | doaj.art-208fdeadbe734c5e8891f38dd349ab40 |
| institution | Directory Open Access Journal |
| issn | 1604-8156 1904-4666 |
| language | English |
| last_indexed | 2024-12-11T12:17:51Z |
| publishDate | 2018-12-01 |
| publisher | Geological Survey of Denmark and Greenland |
| record_format | Article |
| series | Geological Survey of Denmark and Greenland Bulletin |
| spelling | doaj.art-208fdeadbe734c5e8891f38dd349ab402022-12-22T01:07:37ZengGeological Survey of Denmark and GreenlandGeological Survey of Denmark and Greenland Bulletin1604-81561904-46662018-12-0142039064Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East GreenlandMorten Bjerager0Claus Kjøller1Mette Olivarius2Dan Olsen3Niels H. Schovsbo4GEUSGEUSGEUSGEUSGEUSThe fully cored Blokelv-1 borehole was drilled through Upper Jurassic strata in the central part of the Jameson Land Basin, central East Greenland. The borehole reached a total depth of 233.8 m with nearly 100% recovery of high-quality core. An extensive analytical programme was undertaken on the core; sedimentological interpretation and reservoir characterisation were based on facies analysis combined with conventional core analysis, bulk geochemistry and spectral gamma and density scanning of the core. The Upper Jurassic Hareelv Formation was deposited in relatively deep water in a slope-to-basin setting where background sedimentation was dominated by suspension settling of organic-rich mud in oxygen-depleted conditions. Low- and high-density gravity-flow sandstone interbeds occur throughout the cored succession. About two-thirds of the high-density turbidite sandstones were remobilised and injected into the surrounding mud-rock. The resulting succession comprises nearly equal amounts of mudstones and sandstones in geometrically complex bodies. Ankerite cementation occurs in 37% of the analysed sandstones in varying amounts from minor to pervasive. Such ankerite-cemented sandstones can be identified by their bulk geochemistry where Ca > 2 wt%, Mg > 1 wt% and C > 1 wt%. The analysed mudstones are rich in Al, Fe, Ti and P and poor in Ca, Mg, Na and Mn. The trace-metal content shows a general increase in the upper part of the core reflecting progressive oxygen depletion at the sea floor. The reservoir properties of the Blokelv-1 sandstones were evaluated by both conventional core analysis and using log-derived porosity and permeability curves. The high-density turbidite beds and injectite bodies are a few centimetres to several metres thick and show large variations in porosity and permeability, in the range of 6–26 % for porosity and 0.05–400 mD for permeability. Individual sandstone units that are 1–7 m thick yield a net vertical reservoir thickness of 40 m with porosities of 15–26% and permeabilities of 1–200 mD. Heterolithic sandstone–mudstone units are generally characterised by poor reservoir quality with porosities of 2–14% and permeabilities of 0.1–0.6 mD.https://eng.geus.dk/media/20465/nr42_p039-064.pdfHareelv FormationJameson Land BasinUpper Jurassiccore descriptionfacies analysisreservoir quality |
| spellingShingle | Morten Bjerager Claus Kjøller Mette Olivarius Dan Olsen Niels H. Schovsbo Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland Geological Survey of Denmark and Greenland Bulletin Hareelv Formation Jameson Land Basin Upper Jurassic core description facies analysis reservoir quality |
| title | Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland |
| title_full | Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland |
| title_fullStr | Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland |
| title_full_unstemmed | Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland |
| title_short | Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland |
| title_sort | petroleum geology of the upper jurassic lower cretaceous of east and north east greenland blokelv 1 borehole jameson land basin sedimentology geochemistry and reservoir properties of upper jurassic deep marine sediments hareelv formation in the blokelv 1 borehole jameson land basin east greenland |
| topic | Hareelv Formation Jameson Land Basin Upper Jurassic core description facies analysis reservoir quality |
| url | https://eng.geus.dk/media/20465/nr42_p039-064.pdf |
| work_keys_str_mv | AT mortenbjerager petroleumgeologyoftheupperjurassiclowercretaceousofeastandnortheastgreenlandblokelv1boreholejamesonlandbasinsedimentologygeochemistryandreservoirpropertiesofupperjurassicdeepmarinesedimentshareelvformationintheblokelv1boreholejamesonlandbasineastgreenland AT clauskjøller petroleumgeologyoftheupperjurassiclowercretaceousofeastandnortheastgreenlandblokelv1boreholejamesonlandbasinsedimentologygeochemistryandreservoirpropertiesofupperjurassicdeepmarinesedimentshareelvformationintheblokelv1boreholejamesonlandbasineastgreenland AT metteolivarius petroleumgeologyoftheupperjurassiclowercretaceousofeastandnortheastgreenlandblokelv1boreholejamesonlandbasinsedimentologygeochemistryandreservoirpropertiesofupperjurassicdeepmarinesedimentshareelvformationintheblokelv1boreholejamesonlandbasineastgreenland AT danolsen petroleumgeologyoftheupperjurassiclowercretaceousofeastandnortheastgreenlandblokelv1boreholejamesonlandbasinsedimentologygeochemistryandreservoirpropertiesofupperjurassicdeepmarinesedimentshareelvformationintheblokelv1boreholejamesonlandbasineastgreenland AT nielshschovsbo petroleumgeologyoftheupperjurassiclowercretaceousofeastandnortheastgreenlandblokelv1boreholejamesonlandbasinsedimentologygeochemistryandreservoirpropertiesofupperjurassicdeepmarinesedimentshareelvformationintheblokelv1boreholejamesonlandbasineastgreenland |