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A Monte Carlo method for probabilistic hazard assessment of induced seismicity due to conventional natural gas production

S. J. Bourne, S. J. Oates, J. J. Bommer, B. Dost, J. van Elk and D. Doornhof
A Monte Carlo method for probabilistic hazard assessment of induced seismicity due to conventional natural gas production
Bulletin of the Seismological Society of America (June 2015) 105 (3): 1721-1738

Abstract

A Monte Carlo approach to probabilistic seismic-hazard analysis is developed for a case of induced seismicity associated with a compacting gas reservoir. The geomechanical foundation for the method is the work of Kostrov (1974) and McGarr (1976) linking total strain to summed seismic moment in an earthquake catalog. Our Monte Carlo method simulates future seismic hazard consistent with historical seismic and compaction datasets by sampling probability distributions for total seismic moment, event locations and magnitudes, and resulting ground motions. Ground motions are aggregated over an ensemble of simulated catalogs to give a probabilistic representation of the ground-motion hazard. This approach is particularly well suited to the specific nature of the time-dependent induced seismicity considered.We demonstrate the method by applying it to seismicity induced by reservoir compaction following gas production from the Groningen gas field. A new ground-motion prediction equation (GMPE) tailored to the Groningen field has been derived by calibrating an existing GMPE with local strong-motion data. For 2013-2023, we find a 2% chance of exceeding a peak ground acceleration of 0.57g and a 2% chance of exceeding a peak ground velocity of 22 cm/s above the area of maximum compaction. Disaggregation shows that earthquakes of M (sub w) 4-5, at the shortest hypocentral distances of 3 km, and ground motions two standard deviations above the median make the largest contributions to this hazard. Uncertainty in the hazard is primarily due to uncertainty about the future fraction of induced strains that will be seismogenic and how ground motion and its variability will scale to larger magnitudes.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 105
Serial Issue: 3
Title: A Monte Carlo method for probabilistic hazard assessment of induced seismicity due to conventional natural gas production
Affiliation: Shell Global Solutions International, Netherlands
Pages: 1721-1738
Published: 201506
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 63
Accession Number: 2015-081936
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N53°19'60" - N53°40'00", E06°00'00" - E07°00'00"
Secondary Affiliation: Imperial College London, GBR, United KingdomRoyal Netherlands Meteorological Institute, NLD, NetherlandsNederlandse Aardolie Maatschappij, NLD, Netherlands
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201535

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