Previous Talks

Wednesday April 16, 2014

Mechanical Characterization in Unconventional Reservoirs: A Facies Based Methodology

Dave Amendt, ConocoPhillips


A new core testing protocol has been created to characterize rock mechanical parameters based on lithologic composition and rock texture. The goal is to characterize the main rock types using the geologic model as the integration point. High quality mechanical core test calibration data is a fundamental requirement to reduce stress analysis uncertainty, the workflow presented includes systematic quality control measures to ensure rock mechanics data integrity. A four step quality control process using CT scan of core material, elastic repeatability and rock compressive failure criteria will be reviewed and discussed.

The mechanical data supports log-based stress models by providing the static to dynamic transforms of the elastic properties. The elastic transforms can be used to calibrate common frac gradient models. The data also supports facies based geological models, such as those requiring layer-by-layer properties, using the concepts of mechanical lithofacies and mechanical stratigraphy. The mechanical stratigraphy is constructed by integrating the mechanically characterized rock types with a stratigraphic layering model created from core or log descriptions. This geologically conditioned mechanical facies model containing elastic, inelastic, and failure properties is developed as an alternative but complimentary mechanical methodology to the standard log-derived elastic model.

Speaker Biography

Dave Amendt is a Principal Petrophysicist for the Structure & Geomechanics team in GRE Technology at ConocoPhillips. He joined ConocoPhillips in 2004 with the Canadian Business Unit and relocated to Houston in 2008. Prior to ConocoPhillips, Dave spent 14 years at Schlumberger in various technical and operational roles. In his current position, Dave coordinates mechanical testing for non-conventional cores and develops mechanical stratigraphy applications for Geomechanical stress models. Dave has a Bachelor’s Degree in Physics and a Master’s Degree in Nuclear Physics both from the University of Saskatchewan. Dave has been invited to participate in the 2013-2014 SPWLA Distinguished Speaker Series, his 2013 SPWLA conference paper was selected for the Petrophysics Special Issue: ‘Best of 2013 Symposium’.