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!

James Howard presenting at SPWLA Tulsa Chapter luncheon meeting

November 14, 2019

Paul Craddock -Schlumberger, North America

Thermal maturity-adjusted log interpretation (TMALI) in organic shales

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

Abstract: The petrophysical interpretation of downhole logs requires knowledge of accurate matrix properties.   In organic-rich mudrocks (shale), the presence of abundant kerogen (solid, insoluble organic matter) has a particularly large and variable impact on matrix properties.   Matrix properties are highly sensitive to kerogen properties because kerogen is compositionally distinct from minerals that comprise the remainder of the matrix.  In practice, kerogen properties must be accurately known to separate tool responses to kerogen (in the matrix volume) and fluids (in the pore volume), to arrive at accurate volumetric interpretations.  Unfortunately, relevant petrophysical properties of kerogen are nearly always unknown in the formation of interest, and otherwise impractical or impossible to measure.

In this talk, I will present the petrophysical properties of kerogen from the study of more than 50 global shale samples.  The determined kerogen properties include measured chemical composition and absolute density, as well as calculated nuclear properties such as apparent log density, hydrogen index, thermal and epithermal neutron porosities, photoelectric factor, macroscopic capture cross-section (Sigma), and fast neutron cross-section.  For kerogen samples relevant to the petroleum industry (predominantly type II with thermal maturity ranging from immature to dry gas), it is found that petrophysical properties are controlled mainly by thermal maturity, with differences between basins/formations having relatively little effect on kerogen properties.  As a result, universal curves can be established that relate kerogen properties to thermal maturity.  This thermal maturity-adjusted log interpretation (TMALI) establishes a consistent framework to evaluate organic shales globally, requiring only knowledge of the thermal maturity of the play of interest, and provides more accurate, robust, and confident estimates of critical formation parameters including porosity, saturation, and hydrocarbon-in-place.

Biographic: Paul Craddock is a geochemist and Senior Research Scientist in the Applied Math & Data Analytics Department at Schlumberger-Doll Research Center in Cambridge, Massachusetts. His research provides solutions for reservoir characterization using nuclear, X-ray, and infrared spectroscopy methods, such as to derive saturation in low-resistivity pay in conventional reservoirs using nuclear spectroscopy; identify favorable pay for well placement and production in unconventional resources (“RPI”); integrate cuttings and logs for enhanced petrophysics in shale (“DRIFTS”); and optimize kerogen endpoints for global shale interpretations (“TMALI”). Paul received a PhD in chemical oceanography from Massachusetts Institute of Technology/Woods Hole Oceanographic Institution in 2009 and has co-authored more than 40 technical journal and conference publications. Paul is twice a SPWLA Distinguished Speaker and his paper “Thermal maturity-adjusted log interpretation (TMALI) in organic shales” was awarded Best Oral Presentation at the 2019 SPWLA 60th Annual Logging Symposium.

DECEMBER 12, 2019

Please join us Thursday evening, December 12th at 6 p.m.

We will be gathering at Roosevelt's on Cherry Street.  This place goes all out at Christmas-time! 
Bring your beautiful face to this beautiful space, please bring a friend, too. 
There is no cost to attend.  Please do give us an RSVP on so that we can get a head-count for tables.

Roosevelt's is found at:
1551 East 15th Street, Tulsa OK 74120

January 16, 2020

March 12, 2020  TBA

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