Abstract
Tight oil reservoirs present a unique opportunity for dielectric dispersion logging. Dielectric logging is sensitive to the water content and provides water-filled porosity without having to know Archie’s empirical parameters or water salinities, as is required with resistivity log interpretation. Moreover, because of the extremely low permeability of the shale reservoirs, there is effectively no invasion of the borehole fluids into the formation. Thus, in these reservoirs, dielectric dispersion logging directly provides the water-filled porosity of the undisturbed zone. In this paper, we investigate the interpretation of the dielectric dispersion measurements in tight oil formations. A representative core collection was obtained from two intervals in a field. The core material was characterized in terms of lithology and total organic carbon (TOC) content. The cores were cleaned and saturated with brines that match the formation water salinities. Next, the dielectric dispersion measurements on cores were obtained under controlled laboratory conditions of pressure, temperature, and brine salinity. On the basis of the analysis we conducted on these data, we have developed a new method for the interpretation of multifrequency dielectric logs in tight oil reservoirs. The new method has a significant advantage over the existing approaches because it does not require input for either matrix or hydrocarbon permittivities, including kerogen permittivity, to derive water-filled porosity as is the case with the existing approaches. The new method enables the elimination of all associated uncertainties with formation mineral models in complex lithologies, unknown mineral permittivity endpoints, and, most importantly, the poorly defined permittivity of kerogen. The new method requires only the relatively well-known input of formation temperature. Thus, the new method provides a more robust, streamlined, and consistent interpretation of the dielectric dispersion logs in tight oil and reduces the uncertainty on the estimate of hydrocarbon in place.
Speaker Biography
Nikita Seleznev received his PhD in Petrophysics from the Delft University of Technology in The Netherlands. He joined Schlumberger-Doll Research in 2000 and held various positions, including Petrophysics Program Manager and Principal Scientist. During his tenure, Nikita conducted research and led R&D projects on various aspects of petrophysics, including nuclear spectroscopy, petrophysical evaluation systems, and dielectric as well as resistivity logging tools and techniques. Additionally, he studied applications of the induced polarization measurements for formation evaluation and a joint interpretation of the electromagnetic measurements across a wide frequency band. He has published more than 30 papers and holds 9 US patents. Nikita served as an SPWLA Technology Committee member from 2017-2019.
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When
Tuesday, January 19, 2021
11:00 am - 12:00 pm
Cost
At this time we are not going to charge anything for these webinars. We reserve the right to change this in the future.
Webinar reservation: 
Next Month's Talk
Reservoir Pressure in Tight Gas Formations from a Pressurized Core System
Luis Quintero
Halliburton
SPWLA Distinguished Speaker
Forward this newsletter to a friend to invite them to the webinar.
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From the President
Yulia Faulkner
Dear DWLS Members, Colleagues, and Friends,
Happy New Year! I would like to wish you and your family a safe, healthy, and hopefully prosperous 2021!
Welcome back to DWLS 2021 year, I hope you all had a great holiday break, took some time off to re-charge, rest, and ready to tackle anything that comes your way. With COVID-19 vaccine being available and being distributed to front line people, I have a hope that we will see some stability in 2021, we will see small improvements in O&G industry, we can start traveling again and have Face to Face meetings. With that being said, we are still planning to host our January through May luncheons via web in hopes that they become in person for the Fall of 2021.
As the challenging times in our industry will certainly remain in 2021, let us continue working together while keeping a positive attitude for a successful year ahead. We will keep you informed on any further developments that benefit those members that need more of our support. As always, please, do not hesitate to let us know how we can serve you better.
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From the VP - Technology
Jenny LaGesse
Happy new year from DWLS! We hope you are ready to dive into 2021, as we have several excellent speakers with engaging talks. We’re also looking forward to the annual DWLS Spring Workshop, right around the corner in April.
Thank you to everyone who attended the DWLS winter social last month. We had over 30 partygoers at our interactive webinar who enjoyed the presentation from Trevor Sloan and Ian Nieboer of Enverus. It was an informal event, and attendees and presenters chatted over their favorite beverages.
We broke another DWLS record in December with Tom Bratton’s talk “How to Use Dipole Sonic Velocities in Quantitative Petrophysics: Moving beyond the Wyllie and Raymer-Hunt-Gardner Equations”. His presentation had over 70 attendees – making it our best-attended webinar of 2020 – and sparked a marathon of a Q&A session. We thank Tom and all the participants for a great luncheon to wrap up 2020.
Registration is open for this month’s talk with Nikita Seleznev (Schlumberger), an SPWLA Distinguished Speaker. He will present: “Determining Water-Filled Porosity of Tight Oil Reservoirs with a New Interpretation Method for Dielectric Dispersion Measurements” on Tuesday, January 19, 2021. You can register at this link: https://attendee.gotowebinar.com/register/1598991583486169360
In February we are pleased to present another SPWLA Distinguished Speaker, Luis Quintero (Halliburton), and his talk “Reservoir Pressure in Tight Gas Formations from a Pressurized Core System”. His presentation will be held Tuesday, February 16, 2021. Please register at this link: https://attendee.gotowebinar.com/register/4834879592798702096
Last Call for Abstracts! Abstracts for the Spring Workshop are due January 15, 2021! Get yours in today to share your research and expertise with the DWLS community. The workshop will be held online this April 29, 2021, and the topic is: “Horizontal Petrophysics: Applications and Interpretation Techniques in Reservoir Characterization.” Please send abstract submissions to: VP_Technology@dwls.spwla.org.
We welcome abstracts in the following categories:
- Deviated/horizontal well petrophysics
- Applications to geosteering
- Vertical log concepts as applied to horizontal targets
- Applications to reservoir characterization in unconventional reservoirs
- Applications to optimizing completions, production, and estimating OOIP
- LWD interpretation techniques
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Calendar of Events
Click the calendar to the right to view events on the web.
Other Important Events
2021 SPWLA Annual Symposium, May 15-19, 2021 (Boston,MA) - Note this will be held virtually
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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 * |
285 |
348 |
| # that are New members0 |
0 |
15 |
| # that are Students * |
7 |
7 |
| # that are Lifetime Members * |
266 |
263 |
| September luncheon meeting attendance |
49 |
48 |
| October luncheon meeting attendance |
31 |
37 |
| November luncheon meeting attendance |
42 |
32 |
| Holiday party attendance |
30 |
21 |
| January luncheon meeting attendance |
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48 |
| February luncheon meeting attendance |
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60 |
| March luncheon meeting attendance |
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35** |
| April luncheon meeting attendance |
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29** |
| May luncheon meeting attendance |
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64 |
* 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.
** These numbers are skewed due to COVID-19 luncheon cancellations.
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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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