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4D Seismic Integration with Reservoir Mapping While Drilling (RMWD) for Reservoir Heterogeneities Characterization (Al Shaheen Field)Normal access

Authors: G. Berthereau, S. Finlay and M. Viandante
Event name: Third EAGE WIPIC Workshop: Reservoir Management in Carbonates
Session: Case Studies
Publication date: 20 November 2019
DOI: 10.3997/2214-4609.201903124
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 631.85Kb )
Price: € 20

Summary:
Reservoir Mapping While Drilling was run into an Al Shaheen water injector suffering from poor sweep efficiency in order to evaluate saturations changes at and away from the borehole and assess the planned recompletion strategy. The data interpretation suggested high degree of heterogeneities along the well borehole with alternating zones of interpreted sweep and limited/no sweep. The zones with interpreted sweep present different signal distribution: transitional / stripy. 4D seismic hardening (interpreted as Sw increase) is relatively well aligned with RMWD interpretation suggesting asymmetrical injection along well bore and the impact of neighbouring water injector. Integration of the RMWD data with 4D seismic data improves the interpretation of both data sets. If 4D data alone is interpreted, the effect of variable injectivity can be well observed, however the vertical resolution of the data is not high enough to diagnose the causes of the variable injection. If the RMWD data alone is interpreted the pattern can be imaged at high resolution, but could be misleading without the reservoir scale information. The integration with geological information in terms of facies, diagenesis and fault and fractures is critical for all interpretations.


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