| Title | Seismic monitoring of CO2 injection: a multidisciplinary processing approach |
|---|---|
| Authors | Cinzia Bellezza, Erika Barison, Biancamaria Farina, Flavio Poletto, Fabio Meneghini, Gualtiero Boehm, Deyan Draganov, Martijn Janssen, Gijs van Otten, Anna Stork, Athena Chalari, Jordan Bos, William Perry, Auke Barnhoorh, Anna Korre, Sevket Durucan, Baldur Brynjarsson, Vala Hjörleifsdóttir, Andrea Schleifer, Anne Obermann, Pilar Sánchez-Pastor |
| Year | 2023 |
| Conference | World Geothermal Congress |
| Keywords | monitoring, geothermal reservoir, DAS, CO2, modeling, laboratory analysis |
| Abstract | The SUCCEED project (Durucan et al., 2021) aims to study and validate the feasibility of utilising CO2, either produced and captured from the atmosphere for re-injection into the geothermal field for climate change mitigation purpose, whilst permanently storing the CO2 through mineralisation. The goal of this study is to provide a state-of-the-art, cost-effective, and low-environmental impact coupled geothermal-CO2 storage monitoring technique. In this paper, we describe and present the results of the acquisition and processing of monitoring data obtained by a surface novel electromagnetic seismic vibrator source (E-Vibe), using permanent fiber optic distributed acoustic sensors (DAS) together with multi component geophone receiver arrays (provided by courtesy of ETH and OR), for the first stage (performed in July 2021) of the time-lapse monitoring at the Hellisheiði geothermal plant in Iceland. Hellisheiði is one of the two sites studied in the framework of the SUCCEED project. The integration among datasets from different types of sensors resulted in improved quality control (QC) performance, and confirmed the good quality of the collected data. The analysis compares the signal to noise ratio (S/N) and the sensitivity in the broadside helically wound cable (HWC) seismic measurements, with the prediction and recognition of multi-component events in multichannel seismic data of different DAS and geophone systems obtained with co-located geometry. Moreover, thanks to the collaboration between partners, the interdisciplinary study jointly analyzes and puts together the TUD lab results after field campaigns and the evidences from real seismic data at Hellisheiði, including analysis of wavefields, multi-component and subsurface velocity model investigation by different wavefields. In this task, the seismic velocity measurements done at the TUD laboratory (Janssen et al., 2022) were initially used as an input, and then refined. This helps both the assessment of the shallower formation properties and deeper in the reservoir zone. The comparison and joint investigation of both real seismic signals and laboratory geological data includes numerical simulation and imaging, and subsurface model calibration along the main monitoring line provided by trenched HWC DAS sensors for the time-lapse reservoir characterization. Acknowledgements SUCCEED project is funded through the ACT – Accelerating CCS Technologies (Project No 294766) programme. Financial contributions by the Department for Business, Energy & Industrial Strategy UK (BEIS), the Ministry of Economic Affairs and Climate Policy, the Netherlands, the Scientific and Technological Research Council of Turkey (TUBITAK), Orkuveita Reykjavíkur/ Reykjavík Energy Iceland (OR) and Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS Italy (OGS) are gratefully acknowledged. REFERENCES Durucan Ş, Anna Korre A, Parlaktuna M, Şentürk M, Wolf K-H et al.: SUCCEED: A CO2 storage and utilisation project aimed at mitigating against greenhouse gas emissions from geothermal power production, 15th International Conference on Greenhouse Gas Control Technologies, GHGT-15, Abu Dhabi, UAE (2021). Janssen, M., Draganov, D., Bos, J., Farina, B., Barnhoorn, A., Poletto, F., van Otten, G., Wolf, K. and Durucan, S.: Monitoring CO2 Injection into Basaltic Reservoir Formations at the Hellisheiði Geothermal Site in Iceland: laboratory experiments, 83rd EAGE Conference & Exhibition, Madrid, Spain (2022), extended abstract submitted. |