Regional seismic framework of Early Eocene to Mid-Miocene strata across the Central North Sea - presentation by Juan Alcalde at the UKCCSRC Glacistore meeting, 27 February 2015
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Regional seismic framework of Early Eocene to Mid-Miocene strata across the Central North Sea - presentation by Juan Alcalde (University of Edinburgh) at the UKCCSRC Glacistore meeting "Impact of glacial advances and retreats on the strata overlying prospective North Sea CO2 storage sites", 27 February 2015
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Regional seismic framework of Early Eocene to Mid-Miocene strata across the Central North Sea - presentation by Juan Alcalde at the UKCCSRC Glacistore meeting, 27 February 2015
- 1. Regional seismic framework of Early Eocene to Mid-Miocene strata across the Central North Sea Juan Alcalde – University of Edinburgh David Evans – British Geological Survey Christopher Gent – British Geological Survey
- 2. 1.Prepare and submit a pre-proposal bid for North Sea scientific drilling to IODP to investigate overburden strata to CO2 storage sites and impact on their properties of repeated over-riding by glacial ice. 2.Prepare and submit a full bid by responding to review comments on the pre- proposal bid and provision of additional interpretations as required by IODP. 3.Develop an integrated regional seismic sequence stratigraphic framework for the Neogene to Quaternary succession across the UK and Norwegian sectors of the Central North Sea …. Objectives of the Cross-Border Geology Project
- 3. 1.Prepare and submit a pre-proposal bid for North Sea scientific drilling to IODP to investigate overburden strata to CO2 storage sites and impact on their properties of repeated over-riding by glacial ice. 2.Prepare and submit a full bid by responding to review comments on the pre- proposal bid and provision of additional interpretations as required by IODP. 3.Develop an integrated regional seismic sequence stratigraphical framework for the Neogene to Quaternary succession across the UK and Norwegian sectors of the Central North Sea …. Objectives of the Cross Border Geology Project PRE-QUATERNARY STRATAQUATERNARY STRATA
- 4. Target strata interpreted PRE-QUATERNARY STRATA ? ? Knox and Holloway ,1992 Anell et al., 2011
- 5. Study area – CNST82 Survey Target drilling locations CNST82 Survey Statoil NSR05 (“Crooked Line”) 11A 09A 03A 04A 12A 7A 8A 1A 2A 6A 5A
- 6. ~Utsira Sand ~Top Balder Eocene-Oligocene WSW ENE Top of ‘deep’ interpretation Base of ‘deep’ interpretation Statoil NSR05 (“Crooked line”)
- 7. Study area – CNST82 Survey Target drilling locations CNST82 Survey Statoil NSR05 (Crooked line) 06 05 04 11A 09A 03A 04A 12A 7A 8A 1A 2A 6A 5A
- 8. Study area – CNST82 Survey CDP spacing: 25 m Recorder time: 7 seconds 0 1000 2000 3000 1 6000 12000 16000 W E … Vertical exaggeration: 50
- 9. CNST06 0 1000 2000 3000 1 6000 12000 16000 W E Vertical exaggeration: 50
- 12. Two-way (TWT) Maps – BALDER Fm
- 13. Two-way (TWT) Maps – Top Horda?
- 14. Two-way (TWT) Maps – Top Horda? Prograding sequence
- 15. The Western Prograding units Gatliffe et al., 1993
- 16. HSSTMFS LSST/LSW – basin fan? LSST/LW – Channel levee? LSST? LSST? TST? TST? HSST CNST82-06
- 17. ~mid-Miocene (unconformity) Sand-prone basinal fans? ~23.3 Ma? Top Oligocene ST LSST/LSW – basin fan? LSST/LW – Channel levee? LSST? TST? HSST Mid early Eocene- end Eocene ?Late Eocene-Oligocene CNST82-06
- 18. CNST82-06 Utsira Sand ~mid-Miocene (unconformity) – 15Ma ~23.3 Ma? Top Oligocene ?Late Eocene- Oligocene
- 19. ? Diverging Reflectors Boundary extends westward?Basinal Fan ?TSST ?Erosional Seq Boundary ?TSST HSST Sandy Facies ?Channels, fan toes CNST82-05
- 20. CNST82-04
- 22. Global velocity curve y = -9E-05x2 + 1,1336x 0 500 1000 1500 2000 2500 3000 3500 4000 4500 0.00 1000.00 2000.00 3000.00 4000.00 5000.00 6000.00 TWT[ms] TVD [m] REGIONAL TWT-DEPTH
- 23. CONCLUSIONS AND FUTURE WORK 1. The main regional horizons have been identified and mapped across the UK and Norwegian sectors. • Next stage: to compare and match the current interpretation with the interpretation from the Norwegian counterparts (i.e., Petroleum Directorate and the University of Oslo). 2. The structure and trend of the Western Prograding Sequence has been analysed in detail and the sequence stratigraphy modeled. • Next stage: to tie the model to the global sea level curves and use the well log information to provide lithological and hydrogeological characteristics to the units described. 3. A global velocity curve has been generated from 14 wells scattered across the study area. • Next stage: to use this velocity model to convert the interpreted surfaces into depth.