The 2018-19 Dallas Chapter Officers:

PresidentMriganko Sarkar (Pioneer Natural Resources), Mriganko.Sarkar@PXD.com

VP/TechnologySteve Brakeen (Primexx Corp.), Steve.Brakeen@Primexx.com

Secretary, Aaron Green (Schlumberger), AGreen@SLB.com

TreasurerRay Wydrinski (Pioneer Natural Resources), Ray.Wydrinski@PXD.com

Publicist, Jim Lewis(GCC, Great Crew Change), jlewis1@gmail.com

Next Monthly Chapter Meeting:   April 11, 2019,  2rd Thursday

 The Dallas chapter will continue to meet in the DeGolyer & MacNaughton sponsored business conference room located in the Providence Towers building at  5001 Spring Valley Road in North Dallas. Located north of LBJ (I-635), south of Belt Line Road, and on the west side of the North Dallas Tollway, this building has the large open archway in its middle and has a red granite facade. The meeting room is located on the 1st floor of the East Tower. Parking is underground ($1) and can be accessed from either Spring Valley Road or from the southbound service road of the tollway. 

Please RSVP early in order that enough food is ordered and that the chapter does not order too much!! 

Meetings start at 11:30 for a social gathering, followed by a catered buffet at noon (cost $20, students $10). Please contact Dallas SPWLA (mailto:dallasspwla@yahoo.com?subject=RSVP) to receive future meeting notifications by email and for making luncheon reservations (RSVP).

Improved Interpretation of Electrical Resistivity Measurements
in Mixed-Wet Rocks:
 An Experimental 
Core-Scale Application and Model Verification
presented by 
Chelsea Newgord 
(Petroleum Engineering Master’s student in the Hildebrand Department of Petroleum and Geosystems Engineering at The University of Texas at Austin

Interpretation of electrical resistivity measurements for assessing hydrocarbon saturation in mixed-wet and hydrocarbon-wet rocks often requires extensive recalibrations of resistivity models. In these conventional resistivity models, the impact of wettability is not reliably incorporated. Recently, we analytically derived a new resistivity model that incorporates parameters to account for wettability and complexity of pore structure. This new model requires experimental verification to enhance its applicability in core- and log-scale domains. In this paper we (1) experimentally quantify the influence of wettability on electrical resistivity measurements, (2) improved and verified our analytically derived resistivity model in rocks with different levels of wettability at different water saturations, and (3) demonstrated the physical meaning of the parameters related to wettability in the resistivity model. We altered the wettability of selected core samples from the same rock type. To prepare the core samples as mixed-wet, a surfactant solution was injected into the samples and then they were aged in decane. These approaches created a range of wettability states in the samples. To quantify the altered wettability of the samples, we used the combined USBM and Amott-Harvey method along with sessile drop contact angle measurements. Next, we used a centrifuge to vary the water saturation in the core samples. We then measured the electrical resistivity of each sample. Finally, we improved the recently introduced resistivity model and compared the estimates of resistivity index from the improved model against the experimentally measured resistivity indices. We successfully verified the reliability of the improved resistivity model for mixed-wet carbonate core samples. The wettability of the core samples  was altered to be in the range of 0.1 to 0.4 on the Amott wettability scale. We also demonstrated that all the coefficients required by the improved  resistivity model are physically meaningful. One of the unique contributions of this paper is the introduction of a new interpretation diagram, called the wettability triangle. This diagram can potentially be used to quantify wettability from resistivity measurements, if combined with other geophysical measurements. The outcomes of this work are promising for reliable interpretation of resistivity logs in mixed-wet formations for improved assessment of hydrocarbon saturation with minimal calibration efforts.

Speaker Biography:

Chelsea Newgord is petroleum engineering Master’s student in the Hildebrand Department of Petroleum and Geosystems Engineering at The University of Texas at Austin. Previously, she worked as a reservoir geophysicist at Sigma Cubed Integrated Reservoir Services in Denver from 2012 to 2017. Her work included building reservoir models from seismic and well-log data to identify drilling targets. She graduated in 2012 with a BS degree in Geophysical Engineering from Colorado School of Mines, with minors in geology and public affairs. She is a current member of SPWLA, SPE, and SEG. Her research interests include core-analysis, petrophysics, and integrated reservoir characterization.

Meeting Location

Dallas , TX, United States

32° 46' 48.504" N, 96° 48' 1.6236" W

See map: Google Maps

Texas US