Abstract
Wells in the Piceance Basin show anomalous large-magnitude (up to 200 millivolts), large-interval (greater than 2000 ft (610 m)) self-potential (SP) log responses in the Mesaverde gas producing interval that can be best explained by electrokinetic potential resulting from water flow towards producing Mesaverde wells. Water flow is compartmentalized by capillary seals that are formed when gas generated from coals saturates adjacent thinly bedded sandstones and shales. Capillary seals can be identified by shifts in the SP baseline. The first wells drilled in an area with no previous Mesaverde production have very little SP response, as is expected in tight sandstones with single- to double-digit microdarcy permeability. After Mesaverde production is established in a new area, the SP log begins to show stepwise changes to more negative values beginning in the upper Mesaverde and becoming increasing more negative with increased depth. The magnitude of the change to more negative values increases with time in an area of active Mesaverde production; some of the more recent SP logs have negative deflections of over 200 millivolts. This type of SP anomaly has not been reported before, and these anomalies can be used to identify large-scale water movement within a reservoir. Examples of similar SP anomalies have been identified in the Wasatch-Green River and Mesaverde in the Uinta Basin, in the Granite Wash in the Anadarko Basin, the Niobrara in the DJ Basin, and the Pictured Cliffs in the San Juan Basin.
Speaker Biography
Steve Cumella is a consulting geologist in Denver, Colorado, working primarily for Whiting since 2014. He received his bachelors and masters in geology at University of Texas at Austin and started his career with Chevron in 1981. Steve worked the Piceance Basin and other Rocky Mountain basins at Barrett Resources, Williams, Bill Barrett Corporation, and Endeavour International. He was awarded Rocky Mountain Association of Geologists’ Outstanding Scientist Award in 2005 and AAPG’s Robert H. Dott, Sr. Memorial Award for Best Special Publication in 2010. He was an AAPG Distinguished Lecturer in 2011. He is past executive editor of the Mountain Geologist and was president of the Grand Junction Geological Society in 1991. Steve has authored several publications, given numerous presentations, and led several field trips.
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From the Past President
Bob Lieber
I am pleased and proud to place in nomination a slate of officers for the DWLS 2018 / 2019 Board of Directors. Some of these individuals are holdovers from the 2017 / 2018 Board of Directors and we thank them for their continuing dedication by volunteering to serve. The BOD candidates are:
- President - Shannon Higgins (Schlumberger)
- Past President - Sam Fluckiger (SM Energy)
- VP Technology - Patricia Rodrigues (Whiting)
- VP Membership - Stefani Brakenhoff (The Discovery Group)
- Treasurer - Peter Kaufman (QEP)
- Secretary - Rebecca Johnson (QEP)
- Director (Social Events) - Jesse Havens (FractureID)
- Director (Petrophysics Magazine) - Jenny LaGesse (consultant)
- Director (At Large) - Katerina Yared (QEP)
- Editor - Dominic Holmes (Digital Formation)
- Webmaster - Tony Holmes (Digital Formation)
The nominations for next year’s Board of Directors are still open. If you wish to place someone who you think would be a good board member (and if you have their permission) please contact me at Past_President@dwls.spwla.org or give me a call at 720-966-9511. Nominations close April 5, 2018 at 9:00 AM.
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From the President
Sam Fluckiger
Spring is in the air and as always, I hope this message finds you in good health and good spirits. I would like to thank Bill Donovan for his monthly Luncheon talk relating to Mudlogging. Registration has now closed for our spring workshop on Core analysis and I am looking forward to this event on April 10th. The DWLS Board met and decided this month to sign the SPWLA Charter agreement thereby solidifying our relationship with the SPWLA during the years to come. The DWLS will maintain its current membership structure but there will be some changes in how we do certain things such as our election process in 2019. For the most part, these are minor changes that will be the responsibility of the incoming 2018/2019 board to implement but will have a minimal impact on our membership as a whole. I very much appreciate those of you that took the time to provide your feedback on this important decision. I also want to extend my appreciation to everyone that has stepped up and thrown their name in the hat for the 2018/2019 DWLS Board first time and particularly those that have offered to continue in their current capacity. It is your willingness to offer up your time and energy that has and will continue to keep the DWLS going strong.
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Calendar of Events
Click the calendar to the right to view events on the web.
Other Important Events
2018 SPWLA Annual Symposium, June 3-6, 2018 (London, England)
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DWLS Sponsors
Click here to view the sponsors on the website, or click on any image to contact a sponsor.
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Chapter Statistics
Statistic
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This Year
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3-Year Average
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| # of Active members * |
305 |
375 |
| # that are New members |
16 |
12 |
| # that are Students * |
3 |
11 |
| # that are Lifetime Members * |
259 |
311 |
| September luncheon meeting attendance |
53 |
60 |
| October luncheon meeting attendance |
33 |
71 |
| November luncheon meeting attendance |
53 |
60 |
| Holiday party attendance |
29 |
44 |
| January luncheon meeting attendance |
72 |
65 |
| February luncheon meeting attendance |
54 |
67 |
| March luncheon meeting attendance |
41 |
53 |
| April luncheon meeting attendance |
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54 |
| May luncheon meeting attendance |
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49 |
| Summer social attendance |
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22 |
* Note that we did a thorough cleanup of bad email addresses that resulted in some of our members being removed until they can be tracked down again. So this year's membership numbers are going to be a bit lower.
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The DWLS Newsletter is published monthly September through June by the Denver Well Logging Society. For information on membership or advertising, contact the editor. For other inquiries, contact a member of the Board of Directors.
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