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The Oklahoma City Chapter of the SPWLA has its technical luncheon meetings on the second Tuesday of each month at 11:30 am to 1:00 pm (September through May).  The meetings are held at the Petroleum Club of Oklahoma City; 100 North Broadway Oklahoma City, OK 73102 (on the 35th floor of the Chase Building – Downtown OKC).

Annual dues for the OKC SPWLA Chapter are $25.  Checks can be made payable to: OKC SPWLA

SPWLA - Oklahoma City Chapter P.O. Box 2741  Oklahoma City, OK 73101

The OKC SPWLA will have its next technical lunch meeting on Tuesday, April 8th, 2014. The meeting will be on the 35th floor of the Chase Building – Petroleum Club – Downtown OKC at 11:30 am. Lunch for OKC-SPWLA Chapter members with reservations $25; non-members will be charged $30. 

For reservations call Nora Fitzpatrick (Baker Hughes) 917-6791



Core Petrophysics in Unconventional Reservoirs 


John Keller, Schlumberger Reservoir Laboratories





Unconventional reservoirs have become an important source of hydrocarbon production in North America and recent years have seen a dramatic increase in global exploration. Accurate assessments of porosity, permeability, and fluid saturation are vital to understanding overall reservoir quality and production potential. There are, however, a number of complicating characteristics of unconventional rocks that render conventional methods of core and log analysis unusable. These include the high degree of vertical and lateral heterogeneity, artifacts as a result of coring induced micro-fractures, small pores (typically less than one micron in size), and poorly understood transport mechanisms. To address these challenges, we employ an integrated approach utilizing statistical analysis of log data for representative sampling and specialized lab techniques for measuring core properties.


Fluid saturation and porosity are determined using thermal extraction by retort at three distinct temperature steps. We measure both free and clay-bound water as well as mobile oil and bound hydrocarbon (bitumen). We also measure an additional water volume due to expulsion of hydroxyl ions from clay molecules. We compare these data to various other measurements including Karl Fischer titration, thermo-gravimetric analysis (TGA), and Dean Stark toluene combined thermal and solvent extraction. The retort, TGA, and Karl Fischer data generally agree while the Dean Stark data show significantly more water. Oil producing shales pose additional problems for determining saturation due to phase transformation and loss of volatile components. We have developed a method for extracting and characterizing all of the hydrocarbons associated with the rock in order to determine in-situ oil saturation and composition. We integrate core measurements with log data to generate continuous profiles of reservoir properties. Comparisons between log and lab measured properties using these methods show a high degree of correlation.








John Keller is currently a Business Development Manager with Schlumberger Reservoir Laboratories in Salt Lake City, Utah. He previously served as the Core Analysis Division manager for TerraTek, a Schlumberger Company, responsible for all well site core retrieval activities, laboratory core processing, petrophysical and fluid-rock interaction measurements. John holds a Bachelors degree in Geology from the University of Utah. He has extensive experience in tight rock analysis, routine and special core analysis measurements specifically focused on unconventional reservoir rocks (organic-rich mudstones).  John is also very familiar with oil/gas well coring equipment and techniques.  He has been employed at TerraTek since 1989.






The Oklahoma City SPWLA Chapter officers are as follows:


John Arney
Devon Energy
333 W. Sheridan
Oklahoma City, Oklahoma 73102 
VP Technology / Education
Eric Murphy
Chesapeake Energy Corporation
6100 N. Western Avenue
Oklahoma City, OK 73118


VP Membership
Adam Haecker
Chesapeake Energy Corporation
6100 N. Western Avenue
Oklahoma City, OK 73118
Secretary / Treasurer
Craig Mauldin
RKI Exploration & Production
210 Park Ave. # 900
Oklahoma City, Oklahoma 73102

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