The Good, The Bad, and The Ugly of Multi-frequency Pad Based image Tools
Westside Houston
Speaker:
Seminar Date: Apr 23 2026
Registration Opens: Apr 08 2026 - Apr 24 2026
Time: 11:30 AM - 01:00 PM (US CDT)
Admission/Registration Link: None
Donation Link: None
Meeting/Webinar Link: None
Contact: QinShan “Shan” Yang (VP Westside, SPWLA Houston Chapter)
Corresponding: vpwestside@spwla-houston.org
Fees: FREENOTES:
Speaker : Bernd Ruehlicke
Date : Thursday, April 23th, 2026
Time : 11:30 am – 1:00 pm (US CDT)
Venue : SLB, 6350 West Sam Houston Parkway North, Houston, TX 77041
Admission : This activity will include a boxed lunch.
The seminar is sponsored by SLB so there
is no charge for registration,
However, you still need to register using
the applicable links below.
Parking Info : Guest parking is available free of charge. Upon arrival, please proceed to the front desk to check in
Please register by one day before the event to reserve lunch using the above provided link.
Contact : QinShan (Shan) Yang (SPWLA Houston VP Westside)
Corresponding vpwestside@spwla-houston.org
ABSTRACT:
Back in ~2001/2002 Baker Atlas wrote a paper for the 43rd SPWLA Annual Symposium in Japan introducing the EARTH Imager, a new micro-resistivity imaging device for use in oil-based mud. The idea (simply put) was to model the mud and rock as a capacitor and resistor in an AC circuit allowing to derive rock resistivity from the complex sensor signal. It was a major technological step up from the OBMI/OMRI/COI image log tools on the market at that time. A 2nd generation tool was released around 2008/2009 leveraging multiple frequencies to address not just high-resistive rocks but also low-resistive rocks. SLB’s 8 arm NGI (Quanta Geo) was released around 2014 and Halliburton released its STX (StrataXaminer) around 2021 both with 6 and 8 arm setups – all recording complex impedance at multiple frequencies. The presentation will address what delivery one should expect, and tries to, at least partly, help in de-mystifying how to leverage the full breadth of acquired data (real, imaginary, magnitude, phase angle) to support interpretation of detected features and to put them into geological context. Image examples will be given to represent some of the good, bad and ugly of this technology to foster a discussion and might therefore be thought-provoking on purpose. A few mathematical equations may be un-avoidable, but nothing more complicated than Pythagoras, basic trigonometry and vector calculus.
BIOGRAPHY:
Bernd Ruehlicke is the president of Eriksfiord, Inc. He leads the numerical group in Eriksfiord as senior image and sonic log specialist with 30 years of experience in the processing and application of image and sonic logs to geology and geomechanics. Bernd’s first exposure to Image Logs was in 1993 when joining Z&S Geologi in Stavanger to develop geological applications for RECALL(Halliburton). Bernd was president of the SPWLA-Houston chapter (2022-2024) and was a SPWLA distinguished speaker 2021-22. He holds a MSc in theoretical Mathematics, a BSc in Computer Science from Aarhus University, Denmark and an MBA from the University of Houston-Victoria.