The Key to High Resolution Reservoir Characterization
2014
The core provides essential information on grain-size distributions, porosity and permeability variations as well as rock fabric and texture information, which are essential for facies and depositional environment interpretations. Extrapolation and reconciliation of these core lithofacies with open hole derived electrofacies is often problematic, due to the differences in resolutions between the two data types. Core facies are typically “lumped together” into units that can be segregated based upon their log responses. This up-scaling — often based upon log response cutoffs — can lead to differing rock “types” being lumped together because critical textural information related to sedimentary structures is omitted. As a consequence, stratigraphic correlations become based upon recognition of “log shapes,” rather than true reservoir properties, e.g., grain-size trends, bedding attitudes and facies contacts. Integration of core analysis and core descriptions with open hole logs and borehole image-based texture analysis prior to the stratigraphic interpretation can significantly enhance reservoir characterization and stratigraphic correlation. Key core derived information, e.g., grain-size trends, textures or spatial information, can be more readily extrapolated to high resolution borehole images, which in turn provide the essential intermediate link between the physical core and open hole log responses.
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