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Soft Rock Seminar: Julio Leva
Start:December 3, 2012 at 12:00 pm
End:
December 3, 2012 at 1:00 pm
Location:
JGB 3.222
Contact:
Rattanaporn Fongngern (Jah), rattanapornf@utexas.edu
BEG Friday Seminar Series: Dr. Osareni Ogiesoba, BEG
Start:December 7, 2012 at 9:00 am
End:
December 7, 2012 at 10:00 am
Location:
J.J. Pickle Research Campus, Bldg. 130, room #1.202
Video Streaming: Not available for this seminar
SEISMIC INVERSION FOR SHALE GAS/OIL IN THE AUSTIN CHALK AND EAGLE FORD SHALE IN A SUBMARINE VOLCANIC TERRAIN, MAVERICK BASIN, SOUTH TEXAS
Osareni (Chris) Ogiesoba
Bureau of Economic Geology (STARR)
Hydrocarbon exploration in the Austin Chalk began in 1916 with the discovery of hydrocarbon traps located in and around volcanic centers (serpentine plugs) encased by Austin Chalk. Owing to the occurrence of hydrocarbons around these serpentine plugs, exploration efforts were focused on identifying surface as well as subsurface locations of volcanic centers within the Austin Chalk. However, with the realization of the existence of fault-related, fractured reservoirs within the Austin Chalk in the 1980’s, fault zones became the main target of exploration—and the drilling spree started. To date, more than 2,000 horizontal wells have been drilled within the Austin Chalk.
Although some of these wells were successful, many others failed either because they did not penetrate hydrocarbon sweet spots, or hydrocarbon-source-rock distribution within and outside the Austin Chalk was unknown. In this project, seismic inversion studies was conducted by combining seismic data with wireline logs to determine sweet spots and predict resistivity distribution (using the deep-induction log) within the Austin Chalk and Eagle Ford Shale in South Texas.
Results show that >90% of productive zones are in the lower part of the Austin Chalk and are associated with Eagle Ford vertical-subvertical en echelon faults, suggesting hydrocarbon migration from the Eagle Ford Shale. Furthermore, the lower Austin Chalk and upper Eagle Ford Shale together appear to constitute a continuous (unconventional) hydrocarbon play.
In addition, local accumulations within the Austin Chalk may be related to Austin TOC-rich zones or migration from the Eagle Ford through fractures. The quality-factor attribute (Q) can serve as a tool for detecting high-water saturated zones. Although Q was not selected as one of the primary attributes for predicting resistivity, it nevertheless can serve as a good reconnaissance tool for predicting resistivity and brittle zones. Wells that have high water production do so because the water-bearing middle Austin Chalk that sits on the downthrown side of Eagle Ford regional faults constitutes a large section of the horizontal well, as evidenced by the Q attribute. Finally, based on the seismic stratigraphic positions of identified submarine volcanic mounds within the Austin Chalk, volcanic activity probably continued up middle Campanian time.
JSG Fall Graduation
Start:December 8, 2012 at 1:00 pm
End:
December 8, 2012 at 3:00 pm
Location:
McCullough Theatre (in the Performing Arts Complex)
Contact:
Erin Negron, erin.negron@jsg.utexas.edu, 512-471-5870
View Event
Event: The Jackson School of Geosciences 2012 Fall Commencement Ceremony and Reception
Speaker: Brewster McCracken
Reception: Immediately following ceremony, at Holland Family Student Center (JGB), refreshments will be served
DeFord Lecture | Emily BrodskySeptember, 24 2026Time: 3:30 PM - 4:30 PMLocation: JGB 2.324 How Earthquakes Organize Stress by Emily Brodsky, professor at the University of California, Santa Cruz Abstract: Stress is not uniform in the Earth. Therefore, we must use natural experiments to measure the distribution of stresses and related quantities, rather than single values. For instance, dynamic triggering shows that faults are uniformly distributed over their loading cycles in Southern California. The probability that a fault ruptures across a barrier measures the in situ energy distribution. Fault roughness reflects the distribution of strength. These natural experiments produce observable distributions that are surprisingly consistent and suggest some degree of self-organization in the Earth’s crust. Once established, the functional form of the distributions can be used to track changes in response to earthquakes as well as to distinguish fundamentally different fault systems. Transient fault locking before stress release in laboratory experiments can be interpreted as a consequence of self-organization of fault stress. The robust self-organization of multiple variables in earthquake systems suggests that the most consequential mechanical outcome of earthquakes may be the redistribution of stress and the strain energy associated with it. The low friction on a fault during seismic slip as inferred by temperature measurements of the Tohoku earthquake is consistent with dissipation playing a secondary role to this redistribution process. Through stress redistribution and interaction, subduction zone faults tend to synchronize, perhaps due to their geometric simplicity, while the continental system of Southern California cannot synchronize, perhaps due to the complexity of the fault network. Earthquakes organize stress in the crust and produce a suite of well-defined, consistent distributions. |
DeFord Lecture | Courtney SchumacherOctober, 01 2026Time: 3:30 PM - 4:30 PMLocation: JGB 2.324 How Stratiform Rain Shapes Weather, Climate, and the Geological Record by Courtney Schumacher, professor at Texas A&M University |
Bureau of Economic Geology Seminar SeriesOctober, 02 2026Time: 1:00 PM - 2:00 PMLocation: BEG Bldg 130, VR Room 1.116C BEG Seminar presented by Chas Bolton, UTIG, in person. Topic: TBD |
Bureau of Economic Geology Seminar SeriesOctober, 09 2026Time: 1:00 PM - 2:00 PMLocation: https://utexas.zoom.us/j/93201377630?pwd=KzF3TW53SFYzSUg4SUZVNGtxd3JvZ BEG Seminar presented by Bruce Hart, Western University, virtual Topic: TBD |
DeFord Lecture | Ching-Yao LaiOctober, 15 2026Time: 3:30 PM - 4:30 PMLocation: JGB 2.324 |
AI and Your Best SelfOctober, 16 2026Time: 5:30 AM - 8:15 AMLocation: Welch Grand Hallway and 2.224 Auditorium Artificial intelligence is breaking free of chatbots and computer screens and moving into the physical world around us. Next-generation AI systems are learning to see, understand, and act in the world the way a person would. In this Hot Science - Cool Talks, pioneer Dr. Kristen Grauman will explore how these systems will one day coach you through a new skill, guide you through an unfamiliar place, or help with everyday tasks by watching and offering real-time feedback, making personalized learning more accessible. Join us for a look at a future where AI is a part of your environment, helping everyone learn, discover, and navigate the world more easily. |
Bureau of Economic Geology Seminar SeriesOctober, 16 2026Time: 1:00 PM - 2:00 PMLocation: BEG Bldg 130, VR Room 1.116C BEG Seminar presented by Ruthie Halberstadt, JSG, in person. Topic: TBD |