Estimation of fault hydraulic properties on regional time and spatial scales using pre-production overpressure distribution
conference paper
This paper presents preliminary results of the analysis and interpretation of the observed pre-production fluid overpressure distribution in Rotliegend sandstones in block L8 in the Dutch offshore. The general objective of this study is to develop workflows to improve the understanding of timescales of pressure dissipation in relation to regional to basin scale fault models, including fault sealing properties. For this case study we used Eclipse reservoir modeling. The model for the Permian Upper Rotliegend Group includes the numerous gas fields in the area. Based on the configuration of these gas fields in combination with the observed regional overpressure distribution the original fault model could be improved. By creating a ‘dynamically stable’ model, fault multipliers were determined which gave a pressure drop below 1 bar over a period of 5000 years. The resulting distribution of the fault multipliers over the model area
clearly identified differences within the study area. A large part of the estimated fault sealing capacity could be explained by the geometry of the fault (offset and sand-sand juxtaposition). The simulations also showed that only a small area of sand-on-sand juxtaposition requires a reduced fault transmissibility in order to retain the observed overpressure for any length of time.
clearly identified differences within the study area. A large part of the estimated fault sealing capacity could be explained by the geometry of the fault (offset and sand-sand juxtaposition). The simulations also showed that only a small area of sand-on-sand juxtaposition requires a reduced fault transmissibility in order to retain the observed overpressure for any length of time.
TNO Identifier
526031
Publisher
EAGE Publishing BV
Source title
First EAGE / TNO Workshop Basin Hydrodynamic Systems in relations to their Contained Resources, 6-8 May 2015, Utrecht
Pages
1-5
Files
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