Relocating microseismicity from downhole monitoring of the Decatur CCS site using a modified double-difference algorithm

Dando, B. D. E.; Goertz-Allmann, B. P.; Kühn, D.; Langet, N.; Dichiarante, A. M.; Oye, V.

doi:10.1093/gji/ggab255

Relocating microseismicity from downhole monitoring of the Decatur CCS site using a modified double-difference algorithm

Journal Article · Mon Jul 05 00:00:00 EDT 2021 · Geophysical Journal International

DOI:https://doi.org/10.1093/gji/ggab255· OSTI ID:1811730

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NORSAR, Gunnar Randers Vei 15, N-2007 Kjeller, Norway

SUMMARY

The injection of CO2 at the Decatur carbon capture and storage site has generated significant microseismic activity, which occurs in distinct spatial clusters up to approximately 2.2 km from the primary injection well. Accurate and precise event locations are vital for the characterization of the microseismicity to help understand the reservoir response to the CO2 injection, whilst enabling the identification of minor faults and fractures below the resolution of conventional active seismic imaging. However, microseismic monitoring of fluid injection sites, such as Decatur, is often performed using a network of borehole sensors often from a single well. While these downhole sensors have excellent detection capabilities, their poor azimuthal coverage limits the ability to precisely determine event locations. We have developed a modified double-difference relocation algorithm suitable for both 1-D and 3-D velocity models, and which incorporates differential back azimuth observations to allow the benefits of the original double-difference algorithm to be applicable to a downhole microseismic monitoring setting. Applying the modified double-difference algorithm to the microseismicity at Decatur, we have successfully relocated 4293 events. The relocation included over 59 million observations for 757 285 event pairs, split across seven geographic regions. Despite the majority of observations being recorded in only two boreholes, with an almost identical azimuthal coverage, the results have shown to be reliable with significantly reduced residuals and low uncertainties associated with the final locations. We have analysed the residuals in terms of their association with each geographic region, data type, station and individual events, to fully appreciate their influence in the inversion and the fit of the data to the final set of event locations. For each region, the relocated seismicity has become less diffuse with improved clustering, and with newly visible linear features often orientated in a NE–SW direction. These results show the potential improvements that can be made to microseismic event locations recorded by a borehole network with a limited and variable azimuthal distribution.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: Illinois Department of Commerce; USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FC26-05NT42588

OSTI ID:: 1811730

Alternate ID(s):: OSTI ID: 1979487

Journal Information:: Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 2 Vol. 227; ISSN 0956-540X

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Relocating microseismicity from downhole monitoring of the Decatur CCS site using a modified double-difference algorithm

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