Abstract
Tight unconventional rocks are often associated with the presence of laminations, preferentially oriented cracks, and an interconnected network of compliant minerals. Such anisotropic features can be mechanically affected by the pressure depletion during production period. The deformation of the rock fabric leads to the change of tensorial elastic stiffnesses and mechanical parameters, which ultimately impacts directional fluid transport properties. To predict pressure- and direction-dependent physical properties in the rock, we developed an anisotropy template using an integrative approach of rock physics models that considers heterogeneity, texture, and material compliance. In constructing the template, we adopted Thomsen’s anisotropy parameters (ε and γ) to describe the anisotropy of the effective medium. We also integrated the Backus averaging technique and Hudson’s crack model to calculate the effective elastic moduli of the medium, which is constituted by stiff and compliant layers and crack inclusions. We then presented the application of the anisotropy template by using acoustic data of Berea and Bakken Petroleum System cores. Six classifications of rock texture that affect direction-dependent deformation and elastic moduli evolution are discussed. The developed anisotropy template can be utilized for (a) estimating volumetric concentration and spatial distribution of stiff and compliant components, (b) providing an assessment of rock strength and poroelasticity, and (c) predicting the anisotropy magnitude and its evolution path as a function of pressure.
Speaker Biography
Gama crushes rocks in the quest for knowledge. He is currently a Ph.D. candidate in the Petroleum Engineering department at Colorado School of Mines, specializing in the field of advanced rock physics. His research includes characterizing rock-to-rock interaction, rock-to-fluid interaction, and fluid-to-fluid interaction to improve the fracturing design, production forecasting, monitor permeability anisotropy evolution, and optimize stimulation planning in both conventional and unconventional fields, using simultaneous laboratory experimentation with rock physics modeling. He has been investigating the significance of pressure-dependent anisotropic properties by performing an integrative and cohesive experimental approach to characterize pore structure evolution. Apart from geophysical attributes, Gama also observes petrophysical properties in the laboratory such as porosity and permeability at elevated pressures, specific surface area, pore size distribution, micro-CT scan, and mineralogy.
Before taking his Ph.D., Gama joined Tiger Energy Services in 2015 and worked as a wireline engineer specializing in downhole video and camera projects. He was deployed to downhole video/camera selected projects, such as gas storage wells in Texas, geothermal wells, onshore gas fields, offshore oil and condensate wells in Indonesia.
He holds M.Sc (Petroleum Engineering) from Texas A&M University related to unconventional reservoirs. In his research, he investigated the impact of maturity on electrical resistivity of kerogen in organic-rich shales. M.Sc (Petroleum Economics and Management) from Institut Francais du Petrole (IFP), with an intriguing thesis topic of: “Why Are the Companies Still Drilling in Bakken?” and B.Sc (Petroleum Engineering) from Institut Teknologi Bandung, Indonesia.
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Regular luncheon reservation: 
Vegetarian luncheon reservation:
Use one of the PayPal links above to make your luncheon reservation.
If you are registering for someone else or using a PayPal account that is not in your name, please click here to send us an email with the correct registrant information. You should also use this link if you are registering multiple people; please provide the name and company affiliation for each registrant.
Forward this newsletter to a friend to invite them to the luncheon.
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When
Tuesday, February 15, 2021
11:20 am - 1:30 pm
Where
Wynkoop Brewing Company
(tell me how to get there)
Cost
$25 per person
$30 at the door (space permitting)
Next Month's Talk
Robert Lieber
Corsair Petrophysics
The Lyons Sandstone – A Case History of a Conventional Reservoir in an Unconventional Basin
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From the President
Yulia Faulkner
January flew by with a wink of an eye, we had a great January Luncheon/get-together, conversations and great company are always nice to have, especially after having meetings over the screen for most of the time.
A couple of dates for you to keep in mind are April 13-14th – DWLS Spring workshop, details to come.
We are in February, the shortest month of the year. Everything seems quiet in O&G, like after Christmas, nobody is ready to shop yet. Will this be a year for Oilfield Service Companies to drive the changes, rebound, bring long waited AI to life? Oilfield Service companies have always been a technology-driven industry: developing technologies, improving process and performance, setting new goals, making technology efficient and far less data-driven. These technologies and systems were very much capable of generating more information than was immediately applicable, so the data was left unexplored. The latest downturn brought negative oil prices, demolished the need for technology or equipment or even processes. During the downturn, while technology was not used a large need for intelligence, automation, democratizing the data, which was available and not utilized for a long time. We are seeing HAL, SLB, Baker coming up with cloud-based platforms which can help to design, develop, and deploy any Oil and Gas journeys as they wish to. We are seeing IA for predictive maintenance from real-time data, solving problems before they occur. Great developments are ahead of us in the Oil and Gas industry.
Thank you for your continuing support!
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From the VP - Technology
Jenny LaGesse
In the months to come our luncheons will feature:
- February 15, 2022: Gama Firdaus, CSM, “Anisotropy Template for Transversely Isotropic Rocks”
- March 15, 2022: Robert Lieber, Corsair Petrophysics. “The Lyons Sandstone – A Case History of a Conventional Reservoir in an Unconventional Basin”
- April 19, 2022: Scott Jacobson, NoHiddenPay LLC, “Dielectric-Spectroscopy Observations while Drilling in U.S. Unconventional Reservoirs”
- May 17, 2022: Isaac Easow, Geolog Americas Inc., “Advanced Surface Logging Techniques Provide Cost-Optimized Solutions for Reservoir Characterization”
Please register online and we look forward to seeing you there!
We are also very pleased to announce our 2022 Spring Workshop on Cased Hole Formation Evaluation (CHFE), featuring Jim Hemingway (NoHiddenPay, LLC), who is both a former SPWLA President (2020–2021) and former SPE Distinguished Speaker. It will be a 2-day workshop held April 13–14, 2022 at the Tabor Center in downtown Denver. Jim will lead the short course, which will cover older CHFE methods as well as newer technologies, focusing specifically on formation evaluation applications. A detailed course description, as well as pricing for members and non-members, will be available soon.
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Calendar of Events
Click the calendar to the right to view events on the web.
Other Important Events
2022 SPWLA Annual Symposium, June 13-15, 2022 (Stavanger, Norway)
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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 * |
277 |
314 |
| # that are New members |
1 |
15 |
| # that are Students * |
8 |
7 |
| # that are Lifetime Members * |
256 |
261 |
| September luncheon meeting attendance |
25 |
46 |
| October luncheon meeting attendance |
17 |
37 |
| November luncheon meeting attendance |
34 |
28 |
| Holiday party attendance |
n/a |
38 |
| January luncheon meeting attendance |
28 |
43 |
| February luncheon meeting attendance |
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54 |
| March luncheon meeting attendance |
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38** |
| April luncheon meeting attendance |
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43** |
| May luncheon meeting attendance |
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48 |
* 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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