Tectonostratigraphy and Structural Evolution of the Stenlille Structure in Zealand, Denmark – a Site for Natural Gas and CO2 Storage

A quantitative seismic interpretation of the Gassum Formation at the onshore aquifer gas storage near the Danish town of Stenlille is presented with its implications for exploiting the gas storage facility as a potential CO 2 demonstration site. Our objective is to better outline the reservoir heterogeneity of the Gassum Formation based on a 3D seismic volume and 20 wells available from the Stenlille gas storage facility. We have derived new absolute and relative P-impedance inversion products, which are useful for delineating lithological distributions of thin sandstone reservoirs and shaly beds within the Gassum Formation. Our results broadly agree with previously published seismic interpretations, and build upon these by the identification of deviations in parts of the Gassum interval that should be considered in any subsequent development of a static reservoir model. Hence, this work is an important contribution to the planning of drilling new CO 2 injection wells as part of the development and management of the Stenlille CO 2 storage demonstration site. Nevertheless, we also recommend a modern seismic reprocessing of the 3D seismic data combined with newly acquired 2D data from the Stenlille structure as input to further quantitative seismic interpretation studies to refine reservoir characterization and reduce associated uncertainties. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6662413

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Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO ₂ storage demonstration site, onshore Denmark

Bredesen

Smit

Lorentzen

et al. 2023

Geoenergy

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Innovative land seismic investigations for CO₂ geologic storage in Denmark

et al. 2023

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The increasing global interest in geologic carbon storage as a feasible way of reducing CO2 atmospheric levels requires extensive onshore high-resolution seismic investigations to characterize suitable storage sites, for example, close to major CO2 emitters. To partly address this challenge and to acquire quality data at shallower and greater depths in a cost and time-effective approach, a tailored acquisition scheme was adopted and tested at a candidate site in Stenlille, Denmark. The survey aims at understanding whether an anticline reservoir structure known to exist at a 1000 m depth can serve for long-term CO2 storage and presents the structural integrity for this purpose. The data were recorded using a combination of nodal arrays, spaced at 10 m in a fixed geometry, and a set of more closely (2 m) spaced digital recorders, mounted on a landstreamer, which was moved at each shot location. Two 12 t mini vibrators were used as seismic sources. The nodal and landstreamer data sets are compared and combined into a unique data set for reflection imaging purposes along five profiles with a total length of approximately 12 km. The seismic sections obtained using this tailored combination of different recorders provide images of the entire shallow and deeper structures with an unprecedented resolution at the different depth levels necessary to assess the full potential of the suggested CO2 storage reservoir. The results significantly increase the existing knowledge of the extent and structural closure of the reservoir as well as a possible fault, all of which are critical for future risk analysis and planning of the storage.

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Combined onshore and offshore wide-scale seismic data acquisition and imaging for carbon capture and storage exploration in Havnsø, Denmark

Zappalá,

Malehmir,

Papadopoulou

et al. 2024

GEOPHYSICS

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Strong global actions for climate change include carbon capture and storage (CCS) as a feasible solution to reach carbon neutrality and raise opportunities for detailed subsurface investigations. An acquisition set-up designed for onshore-offshore zones was maximized for a wide-scale high-resolution structural imaging and implemented to cover a domal structure of interest for CCS utilization close to the town of Havns�nmark). Challenges of a combined acquisition and processing of land and marine multi-sensor data along a 42 km seismic profile are analyzed, suggested solutions are applied and limitations discussed. On the onshore side, a nodal array and a seismic landstreamer system were simultaneously used while along the transition zone a marine seismic streamer and ocean bottom seismometers were added to record the seismic response generated by two seismic vibrator sources. The adopted sensing domains (velocity, acceleration, and pressure) were studied and different processing steps were evaluated to enable their processing and subsequent data set merging. Results suggest as a best approach, a separate prestack processing of the different data sets and the computation of new geometries and new surface-consistent residual static correction after their merging. The data acquired in the transition zone illuminate for the first time the subsurface geology of the region delineating an expected domal closure. The final seismic section shows high continuity of the reflections with good resolution along the entire profile, identifying the main reservoir structure and the surrounding areas, which are important to ensure the reservoir integrity and safe exploitation over longer time scales. Shallow and deep reflections are consistent with the stratigraphic column from a well-log near the profile. The presented study shows a comprehensive workflow for processing such a multi-sensor data set in onshore and transition zone settings.

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Tectonostratigraphy and Structural Evolution of the Stenlille Structure in Zealand, Denmark – a Site for Natural Gas and CO2 Storage

Cited by 3 publications

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Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO ₂ storage demonstration site, onshore Denmark

Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO ₂ storage demonstration site, onshore Denmark

Innovative land seismic investigations for CO₂ geologic storage in Denmark

Combined onshore and offshore wide-scale seismic data acquisition and imaging for carbon capture and storage exploration in Havnsø, Denmark

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Tectonostratigraphy and Structural Evolution of the Stenlille Structure in Zealand, Denmark – a Site for Natural Gas and CO2 Storage

Cited by 3 publications

References 0 publications

Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO 2 storage demonstration site, onshore Denmark

Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO 2 storage demonstration site, onshore Denmark

Innovative land seismic investigations for CO2 geologic storage in Denmark

Combined onshore and offshore wide-scale seismic data acquisition and imaging for carbon capture and storage exploration in Havnsø, Denmark

Contact Info

Product

Resources

About

Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO ₂ storage demonstration site, onshore Denmark

Improved delineation of the Gassum Formation reservoir zones using seismic impedance inversions: implications for exploiting the Stenlille aquifer gas storage facility as a CO ₂ storage demonstration site, onshore Denmark

Innovative land seismic investigations for CO₂ geologic storage in Denmark