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Title: Illuminating the geology: Post-injection reservoir characterisation of the CO2CRC Otway site

Abstract

Proper site characterisation is essential in the planning stages of a CO 2 storage project; but we can also learn a good deal about the reservoir once the injection is underway or has been completed. During CO2CRC Otway Project Stage 2C, sources of valuable information about storage performance have been generated as a consequence of the staged injection of 15,000 t of CO 2 rich gas, as well as observations from time-lapse seismic surveys and well monitoring data. Now that injection has ceased for Stage 2C, the geological model is compared against field observations for the period spanning injection and 23 months after injection ended. The post-injection reservoir characterisation has proven critical to refine the static and dynamic models for future field development and added assurance about the long-term stabilisation of the CO 2 plume. The south-eastern progress of plume development, as seen on the time-lapse seismic data, has led to a review of the structural interpretation and horizon-fault geometry represented in the models. The developing plume has illuminated the extent of splay faults previously unresolved on the baseline seismic data. Saturation profiles interpreted from pulsed-neutron logs at the injection and observation wells show a preference for higher saturations occurringmore » in high permeability distributary channels penetrated by each of the wells. This has reduced the uncertainty in predicting connectivity of this facies between the wells. The pressure data from numerous injection events has been used to refine the characterisation of the average horizontal permeability of the reservoir zone, and the vertical permeability of the intra-formational seal. Furthermore, it has been used to infer near-field bounding conditions of the interior splay fault, which in turn improves our understanding of containment at the site.« less

Authors:
 [1];  [2];  [3];  [1];  [3]
  1. CO2CRC Ltd, Carlton, VIC (Australia); Commonwealth Scientific and Industrial Research Organization (CSIRO), Kensington WA (Australia)
  2. CO2CRC Ltd, Carlton, VIC (Australia); Commonwealth Scientific and Industrial Research Organization (CSIRO), Kensington WA (Australia); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. CO2CRC Ltd, Carlton, VIC (Australia); Curtin Univ., Bentley, WA (Australia)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Australian National Low Emissions Coal Research and Development (ANLEC R&D)
OSTI Identifier:
1529133
Report Number(s):
SAND-2019-0398J
Journal ID: ISSN 1750-5836; 671544
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 86; Journal Issue: C; Journal ID: ISSN 1750-5836
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Storage performance; Static modelling; Monitoring; Dynamic simulation

Citation Formats

Dance, Tess, LaForce, Tara, Glubokovskikh, Stanislav, Ennis-King, Jonathan, and Pevzner, Roman. Illuminating the geology: Post-injection reservoir characterisation of the CO2CRC Otway site. United States: N. p., 2019. Web. doi:10.1016/j.ijggc.2019.05.004.
Dance, Tess, LaForce, Tara, Glubokovskikh, Stanislav, Ennis-King, Jonathan, & Pevzner, Roman. Illuminating the geology: Post-injection reservoir characterisation of the CO2CRC Otway site. United States. doi:10.1016/j.ijggc.2019.05.004.
Dance, Tess, LaForce, Tara, Glubokovskikh, Stanislav, Ennis-King, Jonathan, and Pevzner, Roman. Thu . "Illuminating the geology: Post-injection reservoir characterisation of the CO2CRC Otway site". United States. doi:10.1016/j.ijggc.2019.05.004.
@article{osti_1529133,
title = {Illuminating the geology: Post-injection reservoir characterisation of the CO2CRC Otway site},
author = {Dance, Tess and LaForce, Tara and Glubokovskikh, Stanislav and Ennis-King, Jonathan and Pevzner, Roman},
abstractNote = {Proper site characterisation is essential in the planning stages of a CO2 storage project; but we can also learn a good deal about the reservoir once the injection is underway or has been completed. During CO2CRC Otway Project Stage 2C, sources of valuable information about storage performance have been generated as a consequence of the staged injection of 15,000 t of CO2 rich gas, as well as observations from time-lapse seismic surveys and well monitoring data. Now that injection has ceased for Stage 2C, the geological model is compared against field observations for the period spanning injection and 23 months after injection ended. The post-injection reservoir characterisation has proven critical to refine the static and dynamic models for future field development and added assurance about the long-term stabilisation of the CO2 plume. The south-eastern progress of plume development, as seen on the time-lapse seismic data, has led to a review of the structural interpretation and horizon-fault geometry represented in the models. The developing plume has illuminated the extent of splay faults previously unresolved on the baseline seismic data. Saturation profiles interpreted from pulsed-neutron logs at the injection and observation wells show a preference for higher saturations occurring in high permeability distributary channels penetrated by each of the wells. This has reduced the uncertainty in predicting connectivity of this facies between the wells. The pressure data from numerous injection events has been used to refine the characterisation of the average horizontal permeability of the reservoir zone, and the vertical permeability of the intra-formational seal. Furthermore, it has been used to infer near-field bounding conditions of the interior splay fault, which in turn improves our understanding of containment at the site.},
doi = {10.1016/j.ijggc.2019.05.004},
journal = {International Journal of Greenhouse Gas Control},
number = C,
volume = 86,
place = {United States},
year = {2019},
month = {5}
}

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