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DOI:10.1306/10262019042
Predicting unconventional reservoir potential from wire-line logs: a correlation between compositional and geomechanical properties of the Duvernay shale play of western Alberta, Canada
Marco Venieri, Per K. Pedersen, and David W. Eaton
University of Calgary, Department of Geoscience. 2500 University Drive NW, Calgary, Alberta, Canada
Ahead of Print Abstract
Unconventional reservoir performance is assessed and quantified via integration of compositional, rock fabric and static mechanical property analyses that are routinely performed on drill core or cuttings. This approach has a number of limitations; for example, it can only be used where drill core and cuttings are available, and comprehensive analysis may be cost-prohibitive at the full scale of a resource play. In this contribution we propose a novel workflow that provides a robust correlation between compositional, mineralogical and geomechanical properties of unconventional shale plays and wireline log signature. Our approach enables the extrapolation of compositional and mechanical reservoir properties into areas where drill core is lacking but wireline logs are available. We illustrate our workflow using a case study from the Duvernay unconventional shale play in western-central Alberta (Canada). Our analysis reveals a high degree of correlation between core-measured mineral components and two wireline logs: pulsed neutron spectroscopy (PNS) and spectral gamma ray (SGR). In particular, we show that PNS-derived calcium, aluminum and silicon concentrations and SGR-derived thorium and potassium concentrations may be used to identify silica-rich, clay-rich and carbonate-rich intervals, respectively, within the reservoir. We show that these intervals exhibit distinct mechanical properties, suggesting that they are also characterized by distinct hydraulic fracturing efficiency. Since well logs are generally more abundant than drill cores, our approach may prove critical in assessing predrill reservoir potential not only in the Duvernay, but in similar unconventional plays worldwide.
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