The 2016-17 Dallas Chapter Officers:

PresidentJohn Byars, JByars at nutechenergy.com

VP/Technology, Mriganko Sarkar, Mriganko.Sarkar at pxd.com

Secretary, Violeta Lujan, violeta.lujan at gmail.com

TreasurerRay Wydrinski, Ray.Wydrinski at pxd.com

Past PresidentRay Wydrinski, Ray.Wydrinski at pxd.com

Publicity & Promotion, Jim Lewis, jlewis1 at gmail.com

Monthly Chapter Meeting:

GREAT NEWS!!  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 first 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 Violeta Lujan (mailto:dallasspwla@yahoo.com?subject=RSVP) to receive future meeting notifications by email and for making luncheon reservations (RSVP).


Next meeting - 11 May 2017  ( 2nd Thursday )


Petrophysical Cut Off Definition Based on Dynamic Reservoir Parameters

presented by

Serge V Galley 


Petrophysicists use cut-offs for calculation of average values that are often part of STOIIP and reserve computations. Generally these cutoff parameters are not rigorously defined.  Cutoffs are most commonly based on static parameters like porosity, saturation and shale content. These may be based on local knowledge about reservoir performance, or might simply be used because “it has always has been done that way”. Of interest here are static and dynamic cutoff parameters that will affect the assessment of pay.  The authors propose a workflow based on application of saturation-height calculations, combined with fractional flow computations, to estimate initial water cut.  The saturation-height calculations utilize property-based Techlog capillary pressure models, and the fractional flow calculations link this through a Python Script to the relative permeability models used by the reservoir engineer. This provides a consistent way to introduce a dynamic element to a pay cutoff definition – for instance by requiring pay to produce only dry oil or requiring pay to be defined as having a minimum initial water cut.  There are numerous parameters which can characterize subsurface rocks and fluids but essentially all of them are directed at one purpose, which is to provide an answer to one question, will this well be economical? The proposed tool allows petrophysicist to help answer this question.

Speaker Biography:

Serge V. Galley is a Petrophysicist, a member of SPWLA and a registered Geoscientist of APEGA. He started his career as logging engineer and petrophysicist in various entities of USSR Ministry of Oil. He received his PhD in 1991 at SoyuzPromGeophysics Institute in Russia. Since that time he has worked as Operational Manager of Western Atlas and VP of American International Petroleum Corporation, responsible for planning and conducting exploration strategy, managing drilling, seismic, logging, testing and production operations and later became Head of G&G Department of Caspian Gas Corporation and Geoscientist for ODS Company. Since 2007 he is a Senior Petrophysicist working for Shell in Houston with his main area of interest being thin bed, low resistivity (TBLR) pay characterization.


Dallas , TX, United States

32° 46' 48.504" N, 96° 48' 1.6236" W

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Texas US