San Joaquin Well Logging Society - Bakersfield, CA

Our next meeting is Wednesday, May 17th, 2017, 11:30 AM at CRC 10000 Stockdale Hwy. We hope to see you there!

Next Talk: May 17th, 2017

Physics Based Model for the Dielectric Response of Shaly Sands
Presented by: Denise Freed


Multifrequency dielectric measurements can be used to determine the water-filled porosity, the water salinity, and the tortousity of the water phase.  In addition, the dielectric response is sensitive to the cation exchange capacity (CEC), particularly in low salinity formations.  To account for the effect of the CEC, we introduce a new physics-based model for the dielectric response of shaly sands in the frequency range of 20 MHz to 1 GHz.  To obtain this model, the polarization of the double layer of the clay particle has been developed from first principles. The new model uses a minimal number of parameters to describe the essential macroscopic properties of shaly sands, and reduces back to a widely accepted dielectric model for clean formations, where the effect from the formation CEC on the dielectric response is negligible. The inversion of the multifrequency data with this model provides a continuous log of CEC, water-filled porosity, salinity, and a water phase tortuosity exponent, which, for fully water saturated rocks, is analogous to the Archie m parameter. To validate the model, we present inversion results of the dielectric measurements from both core and log data. The new model provides reliable results for the determination of water-filled porosity, water salinity, water-phase tortuosity exponent, and CEC in fresh water formations. In particular, the value of the CEC from inversion agrees well with that from core measurements. The low-frequency invaded zone resistivity Rxo can also be predicted based on the inverted parameters, and agrees with independently measured shallow resistivity


Denise Freed is a principal research scientist at Schlumberger-Doll Research. Her current research involves the study of the dielectric response of porous media and the characterization of oilfield fluids by NMR measurements. She holds a PhD in theoretical physics from Princeton University. Before joining Schlumberger in 1997, Denise held a postdoctoral position at the Center for Theoretical Physics at MIT, taught at Wellesley College for a year and had research fellowships at the Bunting Institute at Harvard University and at the Princeton Materials Institute at Princeton University.

Meeting Prices:
Lunch (Member): $25.00 - PayPal
Lunch (Non-Member): $30.00 - PayPal
Lunch (Student): $5.00 - 

Attendees may either pay at the door with cash, credit card, or check (checks payable to: San Joaquin Well Logging Society) or pay in advance through PayPal using the appropriate links above.

Please RSVP by Monday, May 15th by paying in advance or emailing the SJWLS Secretary at

Meeting Location:

10000 Stockdale Hwy Room 390
Bakersfield , CA 93309
United States

Meeting Schedule:
11:00AM: Doors open
11:30AM: Lunch
11:50AM: Society announcements and speaker introduction
12:00PM: Talk
1:00PM: Meeting concludes

Thank you to our previous 2016-2017 sponsors!

December 2016 - Tracerco

Previous Talks:
April 2017: Boqin Sun, "Using NMR to Characterize Fluids in Tight Rock Unconventional and Shale Formations"
March 2017: Richard Merkel, "Advanced Log Interpretation in Field Development"
February 2017: Tom Bratton, "Practical Geomechanics - A Focus on California"
January 2017: Don Nelson, "UIC Project by Project Review"
December 2016: Jon Spencer, "Technical Advances in Tracer Technologies"
November 2016: Mayank Malik, "How Can Microfracturing Improve Reservoir Management?"
October 2016: Robert Lee, "Characterization of Core Using High-Frequency NMR"

San Joaquin Well Logging Society 2016-2017 Committee Members:

President Co-Vice President Co-Vice President
Robert Gales, CRC Katy Jensen-Doescher, CRC David Barnes, Chevron

Secretary Treasurer Publicity
Sara Maloney, LINN Energy Christopher Lalonde, Core Lab Masood Khan, Schlumberger