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Characterization of the structure, stratigraphy and CO2 storage potential of the Swedish sector of the Baltic and Hanö Bay basins using seismic reflection methods
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An extensive multi-channel seismic dataset acquired between 1970 and 1990 by Oljeprospektering AB (OPAB) has recently been made available by the Geological Survey of Sweden (SGU). This thesis summarizes four papers, which utilize this largely unpublished dataset to improve our understanding of the geology and CO2 storage capacity of the Baltic and Hanö Bay basins in southern Sweden.

A range of new processing workflows were developed, which typically provide an improvement in the final stacked seismic image, when compared to the result obtained with the original processing. A method was developed to convert scanned images of seismic sections into SEGY files, which allows large amounts of the OPAB dataset to be imported and interpreted using modern software. A new method for joint imaging of multiples and primaries was developed, which is shown to provide an improvement in signal to noise for some of the seismic lines within the OPAB dataset. For the first time, five interpreted regional seismic profiles detailing the entire sedimentary sequence within these basins, are presented. Depth structure maps detailing the Outer Hanö Bay area and the deeper parts of the Baltic Basin were also generated. Although the overall structure and stratigraphy of the basins inferred from the reprocessed OPAB dataset are consistent with previous studies, some new observations have been made, which improve the understanding of the tectonic history of these basins and provide insight into how the depositional environments have changed throughout time. The effective CO2 storage potential within structural and stratigraphic traps is assessed for the Cambrian Viklau, När and Faludden sandstone reservoirs. A probabilistic methodology is utilized, which allows a robust assessment of the storage capacity as well as the associated uncertainty. The most favourable storage option in the Swedish sector of the Baltic Basin is assessed to be the Faludden stratigraphic trap, which is estimated to have a mid case (P50) storage capacity of 3390 Mt in the deeper part of the basin, where CO2 can be stored in a supercritical phase.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. , 85 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1355
Keyword [en]
Baltic Sea, Baltic Basin, Hanö Bay Basin, OPAB dataset, Seismic reflection, CO2 storage capacity, Seismic interpretation, Seismic processing, Vectorising, Digitizing, Tornquist Zone
National Category
Geology Geophysics Geosciences, Multidisciplinary Other Earth and Related Environmental Sciences
Research subject
Geophysics with specialization in Solid Earth Physics
Identifiers
URN: urn:nbn:se:uu:diva-280684ISBN: 978-91-554-9515-2 (print)OAI: oai:DiVA.org:uu-280684DiVA: diva2:911779
Public defence
2016-05-13, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2016-04-20 Created: 2016-03-14 Last updated: 2016-04-21
List of papers
1. Processing and interpretation of vintage 2D marine seismic data from the outer Hano Bay area, Baltic Sea
Open this publication in new window or tab >>Processing and interpretation of vintage 2D marine seismic data from the outer Hano Bay area, Baltic Sea
2013 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 95, 1-15 p.Article in journal (Refereed) Published
Abstract [en]

A grid of previously unpublished, vintage 2D marine seismic lines has been processed and interpreted to the east of Hano Bay, SW Baltic Sea. The 3200 km(2) study area lies on the transition between the Hand Bay Basin to the West and Baltic Synelcise to the East, NE of the Tornquist intra shield tectonic zone. Data from the NA79, NA80 and RW84 surveys were selected for this study from the extensive Oljeprospektering AB (OPAB) Baltic Sea dataset. New processing workflows have been developed for the data which focus on suppressing two significant forms of noise, namely multiple and side scattered noise. Deconvolution in the tau-p domain, parabolic radon demultiple and post stack deconvolution are shown to be effective at attenuating multiple noise, while FK filtering in shot and receiver gathers is effective at removing side scattered noise.The newly processed data were interpreted and a series of maps detailing the structure of the basement, Cambrian and Silurian/Paleozoic horizons were constructed. These maps differ significantly to previously published interpretations of the area. Within the study area, a region of significant Late Carboniferous/Early Permian transtensional faulting and Late Cretaceous inversion is mapped in detail. This structure would have exhibited normal offsets of up to 600 m before inversion with later inverted displacements of up to approximately 200 m in places. This feature appears to extend some 20 km to the SW of the study area to the major fault bounding the Christianso High. Based on the seismic interpretation, the area appears to have had a similar overall geological history as the adjacent Tornquist Zone to the SW.

Keyword
Multiple attenuation, Tornquist Zone, Hano Bay, Yoldia Well, Structural inversion, OPAB dataset
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-207024 (URN)10.1016/j.jappgeo.2013.04.011 (DOI)000322059200001 ()
Available from: 2013-09-10 Created: 2013-09-09 Last updated: 2017-12-06Bibliographically approved
2. The structure and stratigraphy of the sedimentary succession in the Swedish sector of the Baltic Basin: new insights from vintage 2D marine seismic data
Open this publication in new window or tab >>The structure and stratigraphy of the sedimentary succession in the Swedish sector of the Baltic Basin: new insights from vintage 2D marine seismic data
2016 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 676, 90-111 p.Article in journal (Refereed) Published
Abstract [en]

We present five interpreted regional seismic profiles, describing the full sedimentary sequence across the Swedish sector of the Baltic Sea. The data for the study are part of an extensive and largely unpublished 2D seismic dataset acquired between 1970 and 1990 by the Swedish Oil Prospecting Company (OPAB). The Baltic Basin is an intracratonic basin located in northern Europe. Most of the Swedish sector of the basin constitutes the NW flank of a broad synclinal depression, the Baltic Basin. In the SW of the Swedish sector lies the Hand Bay Basin, formed by subsidence associated with inversion of the Tornquist Zone during the Late Cretaceous. The geological history presented here is broadly consistent with previously published works. We observe an area between the Hand Bay and the Baltic Basin where the Palaeozoic strata has been affected by transpression and subsequent inversion, associated with the Tornquist Zone during the late Carboniferous-Early Permian and Late Cretaceous, respectively. We propose that the Christianso High was a structural low during the Late Jurassic, which was later inverted in the Late Cretaceous. We suggest that a fan shaped feature in the seismic data, adjacent to the Christianso, Fault within the Hand Bay Basin, represents rapidly deposited, coarse-grained sediments eroded from the inverted Christianso High during the Late Cretaceous. We identify a number of faults within the deeper part of the Baltic Basin, which we also interpret to be transpressional in nature, formed during the Caledonian Orogeny in the Late Silurian-Early Devonian. East of Gotland a number of sedimentary structures consisting of Silurian carbonate reefs and Ordovician carbonate mounds, as well as a large Quaternary glacial feature are observed. Finally, we use the seismic interpretation to infer the structural and stratigraphic history of the Baltic and Hand Bay basins within the Swedish sector.

Keyword
Baltic Basin; Hano Bay Basin; Tornquist Zone; Inversion; Transtension; Transpression
National Category
Geophysics Geology Geosciences, Multidisciplinary
Identifiers
urn:nbn:se:uu:diva-280677 (URN)10.1016/j.tecto.2016.03.012 (DOI)000377317500006 ()
Funder
Swedish Research Council, 2010-3657
Available from: 2016-03-14 Created: 2016-03-14 Last updated: 2017-11-30Bibliographically approved
3. A probabilistic assessment of the effective CO2 storage capacity within the Swedish sector of the Baltic Basin
Open this publication in new window or tab >>A probabilistic assessment of the effective CO2 storage capacity within the Swedish sector of the Baltic Basin
2014 (English)In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 30, 148-170 p.Article in journal (Refereed) Published
Abstract [en]

A regional assessment of the effective CO2 storage capacity within the Swedish Sector of the Baltic Sea Basin has been performed. Storage within several deep Cambrian sandstone aquifers, sealed by a thick sequence of Ordovician and Silurian limestone and marlstone, was investigated. Stratigraphic and structural traps were considered within the Faludden, Nar and Viklau reservoirs. Effective CO2 storage capacities and associated uncertainty were calculated probabilistically, using methods outlined by the U.S. Department of Energy and the U.S. Geological Survey. Detailed characterisation of porosity, reservoir thickness, top reservoir structure, CO2 density and storage efficiency factor was performed. A Monte Carlo approach was adopted to generate distributions of effective storage capacity for the scenarios considered. Within the study area, the most suitable structural trap is the S41/Dalders structure, located in the southeastern part of the Swedish sector, with estimated low, mid and high storage capacities of 85 Mt, 145 Mt and 224 Mt, respectively. The regional Faludden stratigraphic pinch out trap was assessed to have low, mid and high effective storage capacities of 4330 Mt, 5579 Mt and 6962 Mt, respectively. The storage capacity methodology outlined here, that includes estimates of uncertainties, may be easily adapted to other areas of interests for geological storage of CO2.

Keyword
OPAB dataset, Storage efficiency factor, Faludden/Deimena, Nar/Viklau, Deep saline aquifers, Uncertainty assessment
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-240130 (URN)10.1016/j.ijggc.2014.09.009 (DOI)000345470700015 ()
Available from: 2015-01-08 Created: 2015-01-05 Last updated: 2017-12-05Bibliographically approved
4. Enhancing primaries using water bottom peg leg multiples
Open this publication in new window or tab >>Enhancing primaries using water bottom peg leg multiples
(English)Manuscript (preprint) (Other academic)
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-280682 (URN)
Available from: 2016-03-14 Created: 2016-03-14 Last updated: 2016-04-21

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