oa Determining Grain-Size Volumetric’s from Image Logs: A Method of Quantifying Reservoir Quality Variations

In sand-shale sequences, more sedimentological details could be measured and quantified with an image log, however, vertical resolution has historically been a major limitation in obtaining the data yielded from core analysis or cuttings. As defaults, sedimentological features like cross bedding, lateral accretion and erosion surfaces, and other elements could be identified to define depositional environments for various intervals along the image log. Porosity variations and permeability require additional data be acquired, such as nuclear magnetic resonance or triple-combo logs, but vertical resolution in these logs is limited.