Gravity changes and natural gas extraction in Groningen
Gravity observations made over the Groningen gas field from 1978 onwards are available. The existing gravity data were reanalyzed and a new survey was carried out. The observed gravity changes obtained during four surveys, spanning an 18-year period, were compared with the gravity effect due to natural gas extraction computed from the reservoir model and the production data. The random error in the gravity values is small enough to detect the effect of gas extraction after a few years (up to 2 {micro}gal/year). The trends obtained from observed and calculated gravity changes agree well within their expected error margins after statistical data snooping. Due to the inadequate measurement set-up of the previous surveys, systematic errors present in gravity data hampered the use of this data for refinement of the reservoir and the production models. However, with improved gravity monitoring, in particular a very systematic network set-up and well-calibrated instruments, this should now be feasible. By using the network analysis from the 1996 measurements for the planning of a network in space and time, most of the current problems can be avoided.
- Research Organization:
- Faculty of Geodetic Engineering, Delft (NL)
- OSTI ID:
- 20003860
- Journal Information:
- Geophysical Prospecting, Vol. 47, Issue 6; Other Information: PBD: Nov 1999; ISSN 0016-8025
- Country of Publication:
- United States
- Language:
- English
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