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Impact of the Hydrocarbon Production on the Reservoir Using 4D Seismic Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 3
Abstract
It is now common practice to monitor the hydrocarbon distribution and reservoir structure during production with the help of 4D seismic. The reservoir monitoring is based on the assumption that information about changes in fluid saturation, pressure and temperature with time is recorded by changes in seismic amplitudes. The detection of changes in the structure (e.g., faults and compaction) of a reservoir may be important because they can seriously influence the behaviour of the reservoir. The study area is part of the Syd Arne field, located in the Danish North Sea, and contains a chalk reservoir of the Tor Formation. The data used in this study consists of 3D seismic cubes obtained in 1995 and 2011, and three angle stacks for each cube. The most evident observation when comparing the two cubes is the compaction observed for a limited part of the reservoir, below a gas cloud in the overburden. This same area shows an increase in fault displacement, and the development of new faults from 1995 to 2011. An AVO analysis is conducted using the angle stacks, and first results indicate a class I anomaly, which shows that the hydrocarbon has a detectable impact on the seismic amplitudes.