Abstract
Hydrocarbon´s accumulations are encountered in conventional reservoirs (sandstones, conglomerates, and carbonates), in unconventional reservoirs (cherts, chalks, diatoms, heavy oils, tar sands, oil shale, shale gas/oil, tight, methane hydrates, and coal bed methane, among others) and in naturally fractured reservoirs.
In each case is possible to apply different methodologies to characterize the reservoirs. Formation evaluation understood as the data integration from open and cased holes, rock samples, mud logging, geophysical info, test and production data has a key role when estimating lithology, shaliness, organic matter, rock quality, flow zones, type, and amount of fluids, porosity, permeability, cutoffs, perf intervals, geomechanics, net to gross, completion programs and lumping/reduced parameters.
Consequently, all the mentioned variables are crucial when performing static and dynamic modeling, resource and reserve estimations, and for properly develop and manage oil and gas fields from primary to secondary and tertiary production.
From a methodological point of view, data can be treated following deductive and inductive methods to get the most from both approaches.
Deductive methods comprise those methodologies that seek to differentiate the data by the computation of a set of component proportions whose identification is linked with wireline log data by some suite of response equations. The model is built considering the number of components and the number of variables (data curves). Normally, measures to detect mismatches and gross errors are included in the techniques although mathematical consistency is not a guarantee of geological accuracy. This situation is well represented by standard log analysis including: volume of shale/clay, total and effective porosity, water saturation, permeability, TOC, Poisson, Young, Biot, Reservoir Quality Index -RQI-, Flow Zone Indicator -FZI-, Flow Unit Characterization Factor -Ht-, cutoffs and pay flags, among others.
On the contrary, inductive methods establish their classes or transformations based on the data set and do not depend on any predetermined correlation among the components. These methods tend to isolate distinctive patterns and to derive classifications or new variables that can be interpreted with a physical meaning. As a result of the great amount of data processed and compared methodologies associated with big data, data mining, artificial intelligence, machine learning, and deep learning are part of them. This type of methodology is adequate for dealing with a large amount of data normally used for characterizing geological characteristics of the reservoirs such as depositional environment, cyclicity, sedimentation rate, electrofacies, spatial distribution of the flow units, among others. Likewise, this approach is performed when reconstructing missing logs and to predict properties.
Examples of inductive methods are cluster analysis, principal component analysis, factor analysis, correspondence analysis, canonical correlation, multidimensional scaling, linear regression, neural networks, and fuzzy logic.
This talk develops both methodologies and provides a helpful way of understanding which approach could be the best one for specific problems. It also shows that deductive and inductive methodologies do not compete and when applied together can provide better results.
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When
Tuesday, April 20, 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
Characterization of Kerogen and Solid Organics of Unconventional Source Rocks Using Solid-Type 20MHz NMR Techniques
Harry Xie
Core Laboratories
Forward this newsletter to a friend to invite them to the webinar.
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From the President
Yulia Faulkner
Greetings DWLS Members and Friends,
Welcome to the Spring Season, April is busy for DWLS and filled with interesting luncheon Talk, Spring Workshop and in addition, DWLS is hosting MiT (Members in Transition) talk. Check our website to mark your calendars for those events of interest to you. If you have not already done so, sign up for email alerts so you won't miss anything.
We are seeing job postings, things slightly started to improve, keep communicating with the peers in the industry, help out when you can. More vaccination sites are opening up and a lot of people getting vaccinated, we are hoping 2021/2022 DWLS season will bring us back to having in-person luncheons and workshops. Please vote for the DWLS board.
As always, reach out, try to attend DWLS talks, and the workshop.
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From the VP - Technology
Jenny LaGesse
Thank you to everyone who attended our March webinar with Greg Salter from Core Laboratories. His presentation on shale reservoir permeability and EUR provided an insightful discussion into where petrophysics and production engineering overlap. As always, we appreciated the lively Q&A participation from our audience!
Registration is open for this month’s webinar featuring SPWLA Distinguished Speaker Luis Stinco (Olempetra), "Formation Evaluation Applying Deductive an Inductive Methodologies: Which one to use when Characterizing Reservoirs." The webinar will be Tuesday, April 20, 2021. This event is free but you must register to attend: https://attendee.gotowebinar.com/register/891529518292350480
We will be wrapping up our 2020-2021 speaker season with our final talk next month:
Tuesday, May 25, 2021:
- Harry Xie (Core Laboratories), "Characterization of Kerogen and Solid Organics of Unconventional Source Rocks Using Solid-Type 20MHz NMR Techniques.” Please note: this date is a week later than our usual meeting to accommodate the SPWLA meeting the week prior. Registration: https://attendee.gotowebinar.com/register/7515645073893961742
DWLS is pleased to host the Rockies MiT (Members in Transition) webinar series on April 22 from 12-1pm. Dr. Amanda Kolker (National Renewable Energy Lab) will speak on “Geothermal 101: Resources, Utilization, and Project Development.” Rockies MiT is a joint effort of members of AAPG, COGA, CU Global Energy Management, DERL, DIPS, DWLS, RMAG, SPE, WENCO, WGA, and WOGA in the Rocky Mountain region to help association members in the midst of a career transition. Registration is free: https://attendee.gotowebinar.com/register/2315117803621292047
Registration for the DWLS 2021 Spring Workshop is open!
Join us for the all-day workshop: “Horizontal Petrophysics: Applications and Interpretation Techniques in Reservoir Characterization.” Attendees will get the latest in original research on the challenges of high-angle log and core analysis from our nine expert speakers, including 3 SPWLA Distinguished Speakers, Denver locals, as well as international guests. It will be held online Thursday, April 29, 2021, from 9 am – 4 pm. Please see the agenda and abstracts online for more details.
Registration will include a workshop PDF with speaker abstracts, bios, and presentation slides. Register today: https://attendee.gotowebinar.com/register/3903816446859566349
Workshop registration fees:
Non-members: $100
DWLS members: $75
Students: $20
If you are a DWLS member or a student, your discount code was emailed to your member email address on March 17. Enter the discount code at the payment screen for your reduced cost. If you are not a member, today is a great day to join!
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From the Past President
Patricia Rodrigues
It is that time of the year when we ask you to vote for the next year's Board of Directors. Because our 2020-2021 had low activity, the majority of the BOD decided to continue serving for 2021-2022. However, we still need to have a significant number of votes to be able to continue operating so we truly appreciate your participation. Please, take few minutes and cast your vote!
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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 * |
279 |
348 |
| # that are New members0 |
1 |
15 |
| # that are Students * |
7 |
7 |
| # that are Lifetime Members * |
260 |
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 |
56 |
48 |
| February luncheon meeting attendance |
36 |
60 |
| March luncheon meeting attendance |
50 |
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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