In this work, we consider the evaluation of the oil saturation left behind in a hydrocarbon reservoir, after oil is displaced by water as a consequence of natural drive oil production, or production supported by water injection in the oil leg. Our study shows that time-lapse changes in the amplitude of the seismic reflection at an oil-water contact and/or produced oil-water contact can be used to directly estimate the displacement efficiency of water displacing oil, ED without the need of a rock and fluid physics model. From this value it is possible to determine the remaining oil saturation if required. An application is performed using a 4D seismic dataset from a producing field in the North Sea. The results suggest a displacement efficiency of between 21 and 65% with an accuracy of 3% due to data non-repeatability (with a NRMS of between 11 and 13%). A pre-requisite for use of the proposed oil-water contact approach is that a discrete contact be interpreted on either the 3D or 4D seismic datasets. Therefore successful application of this technique requires moderate to high quality seismic data and a fairly thick reservoir sequence without significant structural complexity.
|Title of host publication||80th EAGE Conference and Exhibition 2018|
|Publisher||EAGE Publishing BV|
|Publication status||Published - 11 Jun 2018|
|Event||80th EAGE Conference and Exhibition 2018 - Copenhagen, Denmark|
Duration: 11 Jun 2018 → 14 Jun 2018
|Conference||80th EAGE Conference and Exhibition 2018|
|Period||11/06/18 → 14/06/18|
ASJC Scopus subject areas
- Geochemistry and Petrology
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- School of Energy, Geoscience, Infrastructure and Society, Institute for GeoEnergy Engineering - Professor
- School of Energy, Geoscience, Infrastructure and Society - Professor
Person: Academic (Research & Teaching)