Title
Sensitivity analysis and model type evaluation for subsidence above offshore gas reservoirs
Author
Pruiksma, J.P.
Teunissen, J.A.M.
Barends, F.B.J.
Orlic, B.
Cassiani, G.
Nederlands Instituut voor Toegepaste Geowetenschappen TNO
Contributor
Barends, F.B.J. (editor)
Carbognin, L. (editor)
Gambolati, G. (editor)
Steedman, R.S. (editor)
Publication year
2005
Abstract
This paper describes the results of a sensitivity study conducted to understand how the prediction of subsidence due to gas extraction from offshore gas fields depends on a few key parameters, such as connection to the adjacent aquifers and material mechanical properties. The analysis has been performed using an axi-symmetric FE-model. A specific gas production field, the Naomi-Pandora gas field in the Northern Adriatic basin, has been assessed in detail. For each of the layers considered in the stratification a low value, an intermediate and a high value for the stiffness was applied, as determined from oedometer tests, radioactive markers and vertical seismic profiling respectively. The reservoir constitutive behavior has been modeled using different approaches, namely: a linear-elastic, a power law and a Modified CamClay model. The study has been performed for different pressure scenarios representing different levels of interaction with adjacent aquifers. The results show the sensitivity of the subsidence bowl as a result of the imposed conditions. These results are compared with the predictions obtained using 3D non-linear elastic and hypoplastic subsidence models of the same gas fields, demonstrating a good agreement.
Subject
Geological Survey Netherlands
Energy / Geological Survey Netherlands
Reservoir
Compression
Subsidence
Sensitivity
Finite element models
To reference this document use:
http://resolver.tudelft.nl/uuid:ab1068de-ea81-41c9-b013-2a3e3550da34
TNO identifier
504653
Source
Proceedings of the 7th International Symposium on Land Subsidence, SISOLS 2005, Shanghai, China, 23-28 October 2005, 65-78
Document type
conference paper