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:   May 16, 2019,  3rd Thursday (new date!)

 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).

Integration and Comparison of Physical and Digital Rock Properties from a Delaware Basin Well
presented by 
Dr. Joel Walls  
(Director of Unconventional Technology with Ingrain, a Halliburton Service

A core analysis program was conducted on a Delaware basin well in west Texas. The 2nd Bone Spring and Wolfcamp formations were selected for a core testing program. The main objective was to understand reservoir quality, including porosity, fluid saturation, mineralogy, pore size, and pore type. An additional objective was to compare scanning electron microscope- (SEM) based digital rock analysis (DRA) results to physical laboratory tests, such as Gas Research Institute (GRI) crushed rock porosity and total organic carbon (TOC).

Plug samples were obtained for X-ray diffraction (XRD) mineralogy, pyrolysis, TOC, DRA, and retort analysis. DRA included Fourier transform infrared (FTIR) mineralogy, argon-ion milling, SEM imaging, image processing, and segmentation. The pore size and volume fraction of organic porosity, inter- and intra-granular porosity, and solid organic matter were computed. Rock material from near each plug was used for Dean-Stark extraction (Sw, So) and helium porosity. Thus, the relationships between key rock properties, such as clay content vs. TOC, bulk volume water vs. clay content, and bulk volume oil vs. porosity associated with organic matter (PAOM), were determined.

In these samples, TOC was observed to be related to clay content, but not linearly. Rather, TOC increases with clay content up to approximately 30% by weight clay, then begins to decrease. Total clay, silica, and carbonate from XRD and FTIR were in good agreement, although XRD indicated slightly higher clay content than FTIR. As reported elsewhere, SEM-derived porosity is generally lower than helium porosity. In addition, the difference between the two is strongly related to total clay, suggesting that clay-bound water may be a key factor. This is supported by GRI and XRD data that show bulk volume water is directly correlated to total clay with a near-zero intercept.

Understanding that a sweet spot for TOC exists at approximately 30% clay content in these formations may help to target the best reservoir.
Although image resolution and damage to organic porosity from ion-milling are commonly provided explanations for why SEM porosity on ion-milled samples is routinely lower than helium porosity, this work suggests a different reason: capillary-bound water on clay mineral surfaces. This water is driven off in Dean-Stark and retort methods, thus counted as part of total porosity. However, the SEM images do not resolve this adsorbed layer of water on clay surfaces.
When clay-bound water volume is added to SEM porosity and plotted vs. GRI porosity, a linear fit with a slope of near 1 and a correlation coefficient r2 of approximately 0.8 is obtained.

Speaker Biography:

Joel Walls is director of unconventional technology with Ingrain, a Halliburton Service. He has extensive experience in research, development, and commercialization of advanced technology products and services for the upstream oil and gas industry. He joined Ingrain in 2010 to develop services focused unconventional reservoirs. (Ingrain was acquired by Halliburton in 2017.) He is also a co-founder and the first president of the Society of Core Analysts, and is a member of AAPG, SPE, SPWLA, and SEG. He has authored many industry publications and holds four US patents in the fields of digital rock properties and seismic reservoir characterization. Dr. Walls holds a BS degree in physics from Texas A&M University–Commerce, Texas, and MS and PhD degrees in geophysics from Stanford University.

Meeting Location

Dallas , TX, United States

32° 46' 48.504" N, 96° 48' 1.6236" W

See map: Google Maps

Texas US