Calgary Branch PD Evening: Demystifying Geophysics for Engineers
5:30 pm - 9:00 pm
Register by January 6, 2019
Geophysics is the application of physics to geology. This presentation assumes a basic understanding of Newtonian physics and will expand on that to demonstrate that a geophysical seismic shoot is a geomechanical experiment. It will be shown how the geomechanical properties of seismic data can be used to determine elastic properties of rocks, such as Poisson’s ratio, Young’s modulus, compressibility, and rigidity. Compressibility and rigidity are used to interpret oil and gas reservoir properties, such as sand and shale proportions, and fluids that cause the seismic response. Both the elastic and reservoir properties can be compared to known reservoirs and modern geology to interpret the depositional setting and determine the best analogues to use in developing reservoir models. The net result of this presentation should be to demystify the use of geophysics, and particularly seismic.
About the Presenter
In 2015, David Gray, P.Geoph., was honoured for his contributions to value in geophysics as the honoree of the fourth annual Canadian Society of Exploration Geophysicists (CSEG) Symposium. David is the 2018-19 CSEG Distinguished Lecturer. David has made significant contributions to: quantitative interpretation, where three AVO equations have his name on them; seismic fracture characterization, where in 1999 he related azimuthal variations in 3D seismic to fractures in the borehole and where he holds a patent; and in seismic geomechanics, where in 2009 he showed that all three principal stresses can be estimated from 3D seismic data and where he also holds a patent.
David joined Nexen, now CNOOC International, in 2010. He moved to the CNOOC International’s Global Exploration and International Development group in 2016 as a Senior Geophysical Advisor. David spends the bulk of his time working on AVO in Guyana, offshore Canada, and 4D’s from across Nexen’s portfolio. In his previous 6 years at Nexen, David worked in their Oil Sands division. Prior to that, David did 17 years of research for Veritas and CGG in reservoir characterization and seismic signal analysis using experience gained as AVO specialist and seismic data processor for Veritas, Geo-X Systems, and Seismic Data Processors, as well as from his internship in the special projects group at Gulf Canada.
David received a Bachelor of Science in Honours Geophysics from the University of Western Ontario (1984) and a Masters of Mathematics in Statistics from the University of Waterloo (1989). David is a member of SPE, SEG, CSEG, EAGE, and APEGA. He has published and presented about 140 papers within these societies’ journals and conferences and holds three patents. He is a registered Professional Geophysicist in the province of Alberta.
In his spare time, David likes to spend time with his family, write and present technical papers, work with students and young professionals, and participate in volleyball and grassroots motorsports.
Windsor Conference Centre
Calgary, AB T2P 2W1
January 9, 2019
5:30 p.m. to 9:00 p.m.
Registration & Light Refreshments: 5:30 p.m.
Presentation: 6:00 p.m.
David Gray, P.Geoph.
Senior Geophysical Advisor
January 6, 2019