LABORATORY INVESTIGATION OF PETROPHYSICAL APPLICATIONS OF MULTI-FREQUENCY INDUCTIVE COMPLEX CONDUCTIVITY TENSOR MEASUREMENTS - NOV 11 2015
Speaker: Carlos Torres-Verdín, University of Texas at Austin
Date and Time: Lunch 11:30 am, presentation: 12:00 pm, Nov. 11th
Location: BP Plaza Westlake 4 - Room 107, 14110 Grisby Rd. Houston, TX 77079
Cost: Free! Lunch is not provided. Bring you own or purchase in BP cafeteria.
Unaccounted electrical conductivity anisotropy, dielectric permittivity anisotropy, and interfacial polarization of reservoir rocks can adversely affect the conventional resistivity interpretation of laboratory and subsurface electromagnetic (EM) measurements. In order to better quantify the electrical properties of reservoir rocks, we developed and tested an experimental EM laboratory apparatus, herein referred to as the Whole Core EM Induction Tool (WCEMIT). It is used for high-resolution multi-frequency measurement of complex conductivity tensor of 2-ft long, 4-inch diameter whole cores, cylindrical volumes, or test samples in the EM induction frequency range of 10 kHz to 300 kHz. The tensor functionality of this tool is sensitive to the directional nature of electrical conductivity (σ) and dielectric relative permittivity (εr) of geomaterials, whereas its multi-frequency functionality is sensitive to the dielectric-dispersive characteristic of the geomaterials.
We present five laboratory-scale petrophysical applications of the WCEMIT. Various synthetic whole cores, resembling homogeneous, layered, laminated, dipping, vuggy, or conductive-mineral-rich formations were created and used for investigating the WCEMIT’s proposed petrophysical applications.
One application involves a method to measure and model the multi-frequency complex conductivity of whole cores containing disseminated conductive minerals that exhibit large dielectric permittivity and substantial frequency dispersion due to interfacial polarization phenomena. Our laboratory investigations indicate that mixtures containing uniformly-distributed conductive minerals exhibit dielectric permittivity anisotropy and a resultant electrical conductivity anisotropy.
Carlos Torres-Verdín received a Ph.D. in Engineering Geoscience from the University of California at Berkeley in 1991. During 1991-1997, he held the position of Research Scientist with Schlumberger-Doll Research. From 1997-1999, he was Reservoir Specialist and Technology Champion with YPF (Buenos Aires, Argentina). Since 1999, he has been affiliated with the Department of Petroleum and Geosystems Engineering of the University of Texas at Austin, where he is currently Full Professor, holds the Brian James Jennings Memorial Endowed Chair in Petroleum Engineering, and conducts research on borehole geophysics, formation evaluation, well logging, and integrated reservoir characterization. Dr. Torres-Verdín is the founder and director of the Research Consortium on Formation Evaluation at the University of Texas at Austin, which is currently sponsored by 32 companies. He has published over 140 refereed journal papers and 180 conference papers, and is author of 2 patents, has served as Guest Editor for Radio Science, as Associate Editor for the Journal of Electromagnetic Waves and Applications, SPE Journal, and Petrophysics (SPWLA) and is currently Assistant Editor for Geophysics and chair of the editorial board of The Leading Edge (SEG). Dr. Torres-Verdín is recipient of the 2014 Gold Medal for Technical Achievement from the SPWLA, of the 2006 Distinguished Technical Achievement Award from the SPWLA, of the 2008 Formation Evaluation Award from the SPE (Society of Petroleum Engineers), of the 2003, 2004, 2006, and 2007 Best Paper Awards in Petrophysics by the SPWLA, of the 2006 and 2014 Best Presentation Awards and the 2007 Best Poster Award by the SPWLA.