The 2018-19 Dallas Chapter Officers:
President, Mriganko Sarkar (Pioneer Natural Resources), Mriganko.Sarkar@PXD.com
VP/Technology, Steve Brakeen (Primexx Corp.), Steve.Brakeen@Primexx.com
Secretary, Aaron Green (Schlumberger), AGreen@SLB.com
Treasurer, Ray Wydrinski (Pioneer Natural Resources), Ray.Wydrinski@PXD.com
Publicist, Jim Lewis(GCC, Great Crew Change), firstname.lastname@example.org
Next Monthly Chapter Meeting: March 14, 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:email@example.com?subject=RSVP) to receive future meeting notifications by email and for making luncheon reservations (RSVP).
Distinguishing Drilling- Induced from Natural Fractures in Core
Scott P. Cooper, Founding partner with FractureStudies LLC
Induced fractures are common in cores, and some types provide important information on the in situ stress orientation. However, to be useful, they must be distinguished from the natural fractures that form the fracture-permeability system in a reservoir.
Several criteria need to be recognized and utilized to assess the origin of fractures, and several similar fractures may need to be assessed together before making an interpretation. Even mineralization, considered to be definitive of natural fractures, must be assessed carefully since apparent mineralization can consist of artificial materials such as rock flour created during slabbing, glue that is sometimes used to hold a core together during slabbing, and efflorescent minerals deposited on induced fracture faces as pore fluids in the core evaporate. A second criterion, plume structure, occurs on both natural and induced fractures, but on induced fractures the plume axes commonly follow the core axis whereas on natural extension fractures the plume axes more commonly cut across a vertical core.
Induced petal fractures occur in a variety of shapes and sizes, ranging from isolated structures to well-developed families of nested, paired sets on opposite sides of a core; petal fractures always dip downwards towards the center of a core. Petal fractures also, commonly, provide a locus for the origin of centerline fractures. Induced centerline fractures can exploit parallel-striking natural fractures, resulting in composite natural-induced structures with both natural and induced features, complicating interpretations. Both petal and centerline fractures provide an orientation reference since they strike parallel to the maximum horizontal in situ compressive stress. Natural extension fractures are more likely to terminate at bedding boundaries than induced fractures, but the same is not true of natural shear fractures. Distinguishing between natural extension fractures and shear fractures is also important as they can have significantly different effects on the vertical continuity of reservoir permeability, the lateral interconnectivity of a fracture system, and the interaction between natural fractures and hydraulic stimulation fractures.
Scott Cooper is a founding partner with FractureStudies LLC, a consulting firm with expertise in naturally fractured reservoir characterization issues in sandstones, carbonates and shales around the world from Alaska throughout the continental USA to South America, North Africa and Iraq. In 2018, he and John Lorenz co-authored the “Atlas of Natural and Induced Fractures in Core” recognized in an editorial review by The Geological Society (of London) as “A high quality text that should be an essential text in any and all core facilities and essential reading for anyone who spends time looking at core”. Earlier in his career was a Senior Member of the Technical Staff at Sandia National Laboratories (a U.S. Department of Energy facility), working on government and industry-supported energy-related research projects. Scott worked in the tourism, ranching and trout-wrangling fields in the Black Hills of South Dakota before becoming a geologist. He received a BS in geology from the South Dakota School of Mines and a MS in geology from the New Mexico Institute of Mining and Technology. His thesis work involved characterization and modeling of natural fractures in strata at Teapot Dome, a basement-cored anticline in central Wyoming, the database developed from that work continues to be used as a teaching tool in various industry fracture-modeling programs. Scott presently serves as an AAPG delegate. Detailed descriptions, and links to projects, published papers, open-file reports, short courses, core workshops, fieldtrips, webinars and the new Atlas are available at www.fracturestudies.com
Dallas , TX, United States
32° 46' 48.504" N, 96° 48' 1.6236" W
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