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Application of Pyrenean Fractured Carbonate Outcrops for Subsurface Reservoir Characterisation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, cp-451-00726
Abstract
The so-called ‘seismic gap’ remains a major challenge in the appraisal and development of fractured hydrocarbon reservoirs which are generally very heterogeneous in terms of open fracture intensity and connectivity and therefore also in reservoir quality. Acceptable and sustainable well rates largely depends on finding the fracture ‘sweetspots’, but much of the fracture system exist at scales too small to be mapped seismically and too large to be fully determined from well data (ie in the seismic gap). Excellent km-scale exposures of carbonates in the Spanish Pyrenees enables this problem to be tackled head on by studying fractures from micro to macro-scale; their dimensions and distributions provide data for use in reservoir simulation and for guiding well and seismic interpretations. In addition, the influence of mechanical properties and anisotropy on fracture distribution can be examined in detail. The results and principles should be used to underpin and calibrate sub-surface reservoir characterisation.