The members and officers of the SPWLA Tulsa Chapter are proud to revive one of the founding chapters of this prestigious International Society.  Please join us as we continue to promote and advance the science of formation evaluation.

Meetings will be held on 2nd Thursdays (except January will be the 3rd Thursday) bimonthly beginning September 12, 2019, 
11:30am – 1:30pm

The University of Tulsa, Room 121 of Helmerich Hall

800 S Tucker Dr, Tulsa, OK 74104

Interactive campus and parking maps at


Lunch will be provided

$25 for professionals and FREE for students with student ID

 Registration  LINK ( Click here) SPWLA account is required or you will need to create an Account


For catering purposes, reservations must be made no later than 5 days prior to the meeting.

Make your reservations online through the Tulsa Chapter web page at or by emailing

A parking pass will be sent to you prior to the meeting.

Cash and checks only will be accepted at the door.  A credit/debit card link will be available through the Tulsa Chapter web page in the very near future.

SPWLA Tulsa Chapter 2019-2020 Luncheon Speakers:

September 12, 2019

James J. Howard - DigiM Solution  
Machine Learning Methods: Analysis of Rock Images and Beyond

We had a great turnout for the first luncheon meeting of the restarted SPWLA Tulsa Chapter.  It was a full house!  Thank you to our wonderful inaugural speaker who drew guests from as far away as Norman and Oklahoma City.  Thank you to everyone who came to the event and made it a huge success!

November 14, 2019

Paul Craddock Schlumberger-Doll Research Center, North America
Thermal maturity-adjusted log interpretation (TMALI) in organic shales

Authors: Paul Craddock, Rick Lewis, Jeff Miles, and Drew Pomerantz (Schlumberger)

Tulsa Chapter’s November meeting was well-attended for Paul Craddock’s presentation on Thermal maturity-adjusted log interpretation (TMALI) in organic shales…and we got to make tamale jokes.  Again, we had someone drive all the way from Oklahoma City to attend.

DECEMBER 12, 2019
It was a beautiful Tulsa evening, perfect for gathering with friends!

January 16, 2020

Melanie Durand - Shell
Crushed Rock Analysis Workflow Based on Advanced Fluid Characterization for Improved Interpretation of Core Data

Sustained E&P activity levels and slim margins on highly-valued Permian Basin acreage drive operators to leverage information as much as possible and in ways not seen in the recent past. Data accuracy, especially in this fast-paced, competitive environment, is strongly desired. Core analyses provide subsurface static calibration, but the thick stratigraphic section comprised largely of sub-log scale facies, challenges a cost-effective approach to collect sufficient calibration data.

Saturation determination is a key petrophysical deliverable that has multiple uses, including landing zone assessment. Calibration of saturation models may originate in several ways: proprietary or JV core, industry consortia databases, data trades with other operators, government databases, or publications. Internal and external reviews of subsurface model inputs have repeatedly shown that Permian Basin saturations in particular have a wide distribution and large uncertainty. Accurately measuring core fluid saturations in tight rock continues to pose significant challenges originating from the currently accepted lab methods, assumptions used to interpret those data and more broadly, due to increased relative uncertainty associated with tight, low-porosity formations.

For example, crushing core samples, which enhances fluid extraction in tight rocks, causes systematic fluid losses in the case of core samples of liquid rich mudstone formations which are not typically quantified.  Instead, as-received air-filled porosity is commonly assumed to represent hydrocarbons that were forced from core during acquisition/retrieval due to gas expansion.  Additionally, fluid extraction from commercially available retorting systems have widely variable fluid collection efficiencies (<100%) resulting in significant inconsistencies between the weight of collected fluids and sample weight loss during retorting experiments.  

The Dean-Stark technique removes not only water and oil, but an unknown volume of solvent-extractable organic matter, and it only allows for direct quantification of the extracted water volume.  Finally, fluid and solid losses during handling in the lab are unassessed in current commercial lab procedures. The reconciliation of fluid volumes with fluid and sample weight data delivered by either of the two techniques, i.e. retort or Dean-Stark, requires numerous assumptions about pore fluid properties which are typically not verified through direct measurements. We demonstrate that such assumptions can lead to extreme uncertainty in estimates of water saturation. 

To address such critical uncertainties, a new retort-based core analysis workflow using improved core characterization and fluid extraction techniques was developed.  In one advancement, this workflow employs NMR measurements systematically performed on all as-received and crushed samples to quantify fluid losses during crushing.   This approach also uses a specially developed fluid collection apparatus with close to 100% fluid collection efficiency.  In addition to these advances in measurements, the workflow is optimized to avoid fluid losses during sample handling and includes repeated grain density and geochemical measurements at different stages for QC. As a result, the new workflow reduces the uncertainties in acquired data and better addresses the assumptions (i.e. parameter corrections for fluid losses) in interpreting measured data into core total porosity and core fluid saturations.  The workflow is demonstrated for a set of Delaware Basin Wolfcamp A samples and the results suggest that previous crushed rock core analysis protocols underestimate water saturation by at least 30 % or ~15 su for this liquid rich mudstone formation.


Melanie Durand is a Petrophysicist on Shell’s Permian Asset. After joining Shell in 2012, Melanie has worked on projects in Brazil, Argentina, and Colombia before transitioning to the Permian Basin. Melanie has a deep breadth of operational experience in both wireline and core acquisition. She has a B.S. in Mathematics from the University of Louisiana at Lafayette.

March 12, 2020 

Chelsea Newgord - UT Austin
A new workflow for joint interpretation of electrical resistivity and NMR measurements to simultaneously estimate wettability and water saturation

May 14, 2020  TBA

Reach out to us with any questions you may have regarding membership in SPWLA, our luncheon meetings and distinguished speakers, or just drop us a message and let us know how you are and what you are doing.  We would love to hear from you!

SPWLA Tulsa Chapter's email address is

...or you can send a letter to our post office box: 
SPWLA Tulsa Chapter, PO Box 14495, Tulsa OK 74104-9998


President: Elizabeth Dickinson

Vice President of Technology: Maureen McCollum

Treasurer/Secretary: Patrick Ryan