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Th gme 05: Modeling of fault reactivation and fault slip in producing gas fields

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Author: Wassing, B.B.T.
Type:article
Date:2015
Publisher: European Association of Geoscientists and Engineers, EAGE
Source:2nd EAGE Workshop on Geomechanics and Energy: The Ground as Energy Source and Storage, 6-10
Identifier: 533274
ISBN: 9781510814202
Keywords: Geosciences · Compaction · Friction · Gas industry · Geomechanics · Hazards · Induced Seismicity · Natural gas fields · Seismology · Differential compaction · Empirical relations · Fault reactivation · Geomechanical model · Geological Survey Netherlands · 2015 Energy · Geo · PG - Petroleum Geosciences · ELSS - Earth, Life and Social Sciences

Abstract

Current methods which are used for seismic hazard analyses of production induced seismicity in The Netherlands are generally based on either empirical relations which link compaction strain and seismic release or simple relations between available fault area and seismic moment release. Physics based understanding of the impact of streb evolution on faults due to production is needed to reduce uncertainties and support the basic abumptions in seismological models and hazard abebments. Geomechanical analysis shows fault offsets, reservoir geometry and differential compaction play an important role in production induced fault reactivation. These effects are currently not accounted for in the hazard analyses. Both simplified 2D and full field 3D geomechanical models can be used to model the onset of reactivation - and identify faults which are prone to be reactivated. To get more insight into the seismic response of the faults, i.e. the extent of the rupture area and slip displacements, more advanced friction laws need to be incorporated. © Copyright 2015 EAGE.