Denver Well Logging Society Chapter of the SPWLA

Meeting Information

"Subsurface fluid characterization using downhole and core NMR t1t2 maps combined with pore-scale imaging techniques"

Margaret Lessenger
Newfield Exploration Company

Characterization of the subsurface fluid types, porosity, saturations, and wettability are critical for understanding the type and volumes of fluids that will be produced during primary completions and secondary recovery.

Newfield has approximately a dozen wells with NMR T1, T2, and diffusion data in the producing section of Monument Butte Field (Utah, USA). We have identified patterns of NMR, dielectric, and standard triple-combo log data that are associated with differences in estimation of clay-bound water volumes from NMR and XRD data. We present results from pore-scale imaging, NMR core-flood experiments, USBM (United States Bureau of Mines) measurements of wettability, and 2.5D inversion of NMR data used to characterize the variable wettability of GMBU sandstone reservoirs.

We found that the sandstone reservoirs are mixed-wet at the micro- and macro-pore scales, including presence of oil-wet clays. Mixed-wettability complicates estimation of fluid types and volumes from NMR data using standard interpretation techniques.

About the Speaker

Margaret Lessenger is a petrophysicist for Newfield Exploration Company in Denver. She has over 30 years of experience as a geophysicist, geologist and petrophysicist working in various basins in the Rockies, North Sea and Gulf of Mexico. She has worked for the Superior Oil Company, ARCO Oil and Gas, Platte River Associates, the Colorado School of Mines Department of Geology, and Williams Exploration prior to joining Newfield. Lessenger holds a BS in Geophysical Engineering, MS in Geophysics, and PhD in Geology from the Colorado School of Mines. She is a member of SPWLA, AAPG, SPE and SCA.

From the President

Suzanne Heskin

Hello!  I hope everyone is enjoying the beautiful autumn our great state is having.  The DWLS year has started off well, and I encourage all of you to continue attending the luncheons that Bob has been doing a great job of organizing.  Bring a co-worker, even if they aren't a petrophysicist, as they may learn something that will help them or help in communications between disciplines.

If you happened to attend SEG recently and saw/heard/learned something that might be of interest to DWLS members, let the board know and we can find a way to share that information.

A short thank-you to the board, and specifically Katarina for doing such a great job this fall.  We have a fantastic group of board members this year.


From a Vice President - Membership

Aaron Fisher (Tracker Resources)

Hello everyone!

November is right around the corner, which means that the yearly renewal process is almost up.  Those of you who have not renewed your yearly dues can do so by clicking on the following link: (  November marks the end of the grace period for yearly members to renew.  If you do not renew you will be dropped from the monthly newsletter.  Don't miss out on hearing about the spring workshop and all the monthly talks.

Some good news: 2015 has been a difficult year for many of us, however, DWLS membership has continued to grow.  Currently we have 378 members of which 308 are lifetime members, up from 351 and 296 last year!


SPWLA Events

2016 Annual Symposium, June 25-29, 2016 (Reykjavik, Iceland)

Meeting Details

Beverage Sponsor
Please thank The Leeds Group for sponsoring the free beverage tickets this month (beer, wine or soda)!

11:20 am - 1:30 pm
Wynkoop Brewing Company
(tell me how to get there)
$20 per person
$25 at the door (space permitting)
Must be made on-line at before 5 PM on Thursday, . Or click below to go directly to PayPal.

Please note that the room has a maximum capacity of about 100 people. We have generally allowed walk-ins in the past. However, if we approach this limit with paid reservations, walk-ins will be turned away!
Cancellations must be made no later than 5 PM the Friday prior to the talk, or you will be responsible for the full cost of the luncheon!  or contact Lisa Gregor at 303-770-4235.  Our full cancellation/wait list policy is available on the website.
Luncheon Talk
"Impact of experimental studies on unconventional reservoir mechanisms (SPE 168965)"

Richard Rosen

Calendar of Events

Click to view the calendar on the web.

Chapter Statistics


This Year


# of Active
378 345
# that are
New members
8 27
# that are
11 9
# that are
Lifetime Members
308 275
September luncheon
meeting attendance
80 81
October luncheon
meeting attendance
83 63
November luncheon
meeting attendance
December holiday party attendance   59
January luncheon
meeting attendance
February luncheon
meeting attendance
March luncheon
meeting attendance
April luncheon
meeting attendance
May luncheon
meeting attendance
June summer social attendance   31



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