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. 

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

A handsome group turned out for Melanie's presentation.  We hope to have her back to update us on her ongoing research.

February - March 2020
Nomination and Election of Officers for 2020-2021 
Make sure your SPWLA National Membership is current to participate
Our Nominating Committee will be reaching out to membership soon!!!

March 12, 2020
 - NOTE: This meeting will be held in Studio Blue, 2nd floor of Helmerich Hall...follow the signs

Register/Pay Online:

Chelsea Newgord - UT Austin
A New Workflow for Joint Interpretation of Electrical Resistivity and NMR Measurements to Simultaneously Estimate Wettability and Water Saturation

Chelsea Newgord, Artur Posenato Garcia, and Zoya Heidari, The University of Texas at Austin


Wettability of rocks can be assessed from interpretation of borehole geophysical measurements such as electrical resistivity and Nuclear Magnetic Resonance (NMR). These wettability models often require additional inputs (e.g., water saturation, porosity, and pore-geometry-related parameters), which are difficult to obtain independently. Consequently, a multi-physics workflow that integrates resistivity and NMR measurements can reduce the number of input parameters, resulting in a more accurate and robust wettability assessment. The objectives of this work are (i) to introduce the workflow for joint interpretation of resistivity and NMR measurements to simultaneously estimate wettability and water saturation, and (ii) to verify the reliability of estimates of wettability and water saturation by comparison to experimentally measured contact angles, Amott Indices, and gravimetrically assessed water saturation.

The new workflow for assessing wettability and water saturation combines non-linear resistivity- and NMR-based rock physics models. The inputs to the resistivity-based wettability model include the resistivity of the rock-fluid system and brine, porosity, and pore-geometry-related parameters. The NMR-based wettability model requires the transverse (T2) responses of the rock-fluid system, of the saturating fluids, and of water-wet water-saturated and oil-wet oil-saturated rocks. To verify the reliability of the new integrated workflow, we perform resistivity and NMR measurements on core samples from different rock types, covering a range of wettability and water saturation levels. These measurements are inputs to the non-linear models, which are simultaneously solved to estimate wettability and water saturation for each core sample. We verify the reliability of wettability estimates by comparison to the Amott Index and contact angle measurements, and the water saturation estimates by comparison to the gravimetrically measured water saturation.

We successfully verified the reliability of the new method for joint interpretation of resistivity and NMR measurements to estimate wettability and water saturation of limestone and sandstone core samples. For water saturation levels ranging from irreducible water saturation to residual oil saturation, we observed an average relative error of 11% between the gravimetrically assessed and the model-estimated water saturation. It is challenging to estimate water saturation in rocks with multi-modal pore-size distribution uniquely from the interpretation of NMR measurements. The introduced integrated workflow improved the accuracy of water saturation estimates in rocks with complex pore structure. For the wettability ranging from oil-wet to water-wet, we observed an average absolute difference of 0.15 between the experimentally measured Amott Index and the model-estimated wettability. These model-estimated wettability values were also consistent with the contact angle measurements. It should be noted that the new workflow relies on physically-meaningful and measurable parameters, which minimizes calibration efforts. Furthermore, the multi-physics workflow eliminates the non-uniqueness associated with wettability and water saturation estimates obtained from independent interpretation of NMR and resistivity measurements.



Speaker Biography:

Chelsea Newgord recently received her MS in petroleum engineering from The University of Texas at Austin. She currently works in the Formation Evaluation group at ExxonMobil in Houston. Previously, she worked as a reservoir geophysicist at Sigma Cubed Integrated Reservoir Services in Denver from 2012–2017. She holds a BS degree (2012) in geophysical engineering from Colorado School of Mines, with minors in geology and public affairs. She was designated as a Distinguished Speaker for 2018–2019 and 2019–2020 by SPWLA. She is a member of SPWLA, SPE, and SEG. Her research interests include core analysis, formation evaluation, and multi-disciplinary reservoir characterization.

May 14, 2020

Michael P. Smith, PhD - Advanced Hydrocarbon Stratigraphy (AHS)
AHS VAS Cuttings Well Logs

AHS’s VAS technology marketed by Baker Hughes is a breakthrough patented cuttings and core analytical technology providing high value well logs having a multitude of information at low cost and without the cost of any additional rig time.

The goals of our cuttings Volatiles analyses include:
1) Providing Well Logs generated from cuttings detailing a host of attributes for horizontal wells, and vertical wells, at a low cost, and for which there is no additional Rig time required.
2) Picking landing sites from pilot holes in real time,
3) 24-hour analyses of cores on a 3 foot sampling basis for oil saturation, relative Permeability, and Mechanical strength

We work on new cuttings, old cuttings, OBM and WBM wells, PDC and Rock bits, and cores. Samples from both horizontal and vertical wells are evaluated. We analyze either sealed at well samples, or washed and dried samples that we load in the lab.

We have developed unique capabilities for quantitative analyses of formation water in cuttings that allows us to map pay by generating total water Sw logs, as well as macro Sw and micro Sw curves from cuttings (patents pending).

Our 2 main focuses are Pay and Reservoir.

For pay we focus on where is the pay, what is the pay, what is the pay’s quality, how much will the well produce, how will the stages produce, and which if any stages have been already drained by parent-child interactions, or natural conduits such as faults.

For reservoir our focus is permeable versus tight, Mechanical Strength, geohazards especially faults, and we are developing a natural tracer product from our cuttings analyses to evaluate/predict stage performance.

Formic and Acetic organic acids, and inorganic gases including He, CO2, and a variety of Sulfur gases are also analyzed and integrated into our pay and reservoir evaluation.
We analyze the very small amounts of present day product still held in the PDC cuttings. Our sample prep and analyses are very gentle so as to preserve and analyze all the oil and gas still held in the cuttings

Mike Smith, the inventor of VAS, received a PhD. In Geology and Geophysics from the University of Hawaii in 1981. Mike was at Amoco Research for 10 years where he invented FIS, Fluid Inclusion Stratigraphy, now owned and marketed by Schlumberger. Mike resigned from Amoco and started AHS in 1994. At AHS Mike invented FIV, Fluid Inclusion Volatiles. Mike sold FIV to ExxonMobil URC in 1999, and consulted for URC on and off until 2009. Mike restarted AHS in 2010 and developed VAS, Volatile Analytical Services, which analyzes trace amounts of present day formation fluids in cuttings and cores. AHS teamed up with BH to market VAS worldwide in 2018.

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