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Abstract

The Zechstein 2 Carbonate reservoir is part of the Basal Zechstein Unit, which developed in the northeast Netherlands mainly as an anhydrite platform at the southern fringe of the Southern Permian Basin. The facies within the Zechstein 2 Carbonate Member reflect platform, slope, and basinal settings. The subsurface data collected in the exploration and development of the Zechstein fields have led to a detailed sedimentological model for the Zechstein 2 Carbonate Member.

Prospects in the Zechstein 2 Carbonate Member are seismically defined as structural highs at the Top Zechstein 2 Anhydrite level. As exploration moves towards the search for more subtle traps, 3-D seismic data become indispensable.

Basal Zechstein isochore maps determined on 3-D seismic volumes display the topography of the Basal Zechstein platform. Using the sedimentological model, these maps are used to estimate gross reservoir thickness. Variations in reservoir parameters, especially porosity, of the Zechstein 2 Carbonate Member are reflected in the seismic response. Through synthetic seismic modeling, 3-D seismic data allow spatial prediction of average reservoir porosity. The Collendoornerveen exploration well demonstrates the successful application of the quantitative interpretation techniques.

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