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Abstract

Summary

After almost two years of monitoring of the Groningen reservoir in the Zeerijp area, Netherlands, the set of microseismic locations now enables to confirm at the local scale several properties of the seismic activity in the Groningen gas field. Events occur (i) mainly within the reservoir, (ii) along fault segments identified at the base Zechstein formation and (iii) have magnitude distributed according to a Gutenberg-Richter with a b-value of 0.82 ± 0.03. Our catalogue contains more than 500 events with M > −2.5 with a completeness level of 0.1. The period covered also underwent a significant rise in seismicity in relation to past activity levels, with the notable occurrence of four M > 2 events. Extrapolation of the Gutenberg-Richter law provides a 10 to 17 years return period for a M ≥ 3.9 in this area. The processing of such events proved to be particularly challenging due to the deployment of sensors within a low-velocity layer, leading to very complex waveform signatures. We had to develop a multi-phase location approach, in combination with comparison with synthetic waveforms to overcome this difficulty.

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/content/papers/10.3997/2214-4609.201600016
2016-01-31
2024-04-26

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201600016
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Location Results from Borehole Microseismic Monitoring in the Groningen Gas Reservoir, Netherlands
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201600016
/content/papers/10.3997/2214-4609.201600016
/content/papers/10.3997/2214-4609.201600016
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