Events

JSG Happenings

Events

February 2019 April 2019
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DeFord Lecture: Yi Ming

February, 21 2019

Time: 4:00 PM - 5:00 PM
Location: JGB 2.324

UTIG Seminar Series: Baole Wen, UT ICES

February, 22 2019

Time: 10:30 AM - 12:00 PM
Location: PRC ROC Room 1.603

Click to watch the seminar online.

Speaker: Baole Wen, Bureau of Economic Geology, Jackson School of Geosciences & Center for Petroleum & Geosystems Engineering, Institute for Computational Engineering and Sciences, The University of Texas at Austin

Host: Kehua You

Title: Modeling of convective CO2 dissolution in a closed porous media system: from low-pressure ideal-gas to high-pressure real-gas conditions

Abstract: Motivated by geological carbon dioxide (CO2) storage, many recent studies have investigated the fluid dynamics of solutal convection in porous media. Here we study the convective dissolution of CO2 in a closed porous media system, where the pressure in the gas declines as convection proceeds. This introduces a negative feedback that reduces the convective dissolution rate even before the brine becomes saturated. We analyze the case of an ideal gas with a solubility given by Henry’s law, in the limits of very low and very high Rayleigh numbers. The equilibrium state in this system is determined by the dimensionless dissolution capacity, ?, which gives the fraction of the gas that can be dissolved into the underlying brine. Analytical approximations of the pure diffusion problem with ? > 0 show that the diffusive base state is no longer self-similar and that diffusive mass transfer declines rapidly with time. Direct numerical simulations at high Rayleigh numbers show that no constant flux regime exists for ? > 0; nevertheless, the quantity F/Cs2 remains constant, where F is the dissolution flux and Cs is the dissolved concentration at the top of the domain. Simple mathematical models are developed to predict the evolution of Cs and F for high-Rayleigh-number convection in closed systems. Finally, the modeling is extended to high-pressure & real-gas conditions and verified using laboratory experiments.

UTIG Special Seminar: Xiaotao Yang

February, 25 2019

Time: 11:00 AM - 12:00 PM
Location: PRC ROC Room 2.201

Join us for an informal special seminar in the second floor conference room at UTIG.

Speaker: Xiaotao Yang, Postdoctoral Researcher, University of Massachusetts Amherst

Host: Thorsten Becker

Title: Seismic imaging of slab segmentation and correlation with volcano distribution along the Aleutian-Alaska subduction zone

Abstract: The along-strike variation (segmentation) of downgoing slabs and surface volcanic activity has been observed globally. However, the influence of slab segmentation on volcano distribution is poorly understood. The diverse magmatism and the presence of volcanic gaps make the Aleutian-Alaska subduction zone an ideal place to investigate this question. Using full-wave ambient noise tomography, we present a high-resolution shear-wave velocity model in Aleutian/Alaska. The new model reveals a distinct high-velocity Pacific slab along the Aleutian arc, subducting at a steeper angle than the Yakutat slab beneath southcentral Alaska. The change in slab geometry and mantle wedge velocities correlate with the non-uniform distribution of volcanic activities. In contrast to the back-arc and forearc low velocities within the Aleutian mantle wedge, the seismically fast mantle wedge beneath the Denali volcanic gap may indicate the lack of melt. Our findings provide direct evidence for the correlation between slab segmentation and magmatism at subduction zones.

UTIG Seminar Series: Pascal Audet, University of Ottawa

March, 01 2019

Time: 10:30 AM - 12:00 PM
Location: PRC ROC Room 1.603

Click to watch online.

Speaker: Pascal Audet, University of Ottawa

Host: Thorsten Becker

De Ford Lecture Series: Mark Jellinek

March, 05 2019

Time: 4:00 PM - 5:00 PM
Location: JGB 2.324

UTIG Brown Bag Seminar: Ian Dalziel, UTIG

March, 05 2019

Time: 12:00 PM - 1:00 PM
Location: PRC ROC Room 1.603

Informal weekly presentations by UTIG students and researchers. Bring your lunch!

Speaker: Ian Dalziel, Research Professor, UTIG

Guest speaker: Tamara Pico

March, 07 2019

Time: 12:30 PM - 2:00 PM
Location: JGB 4.102

De Ford Lecture Series: Bette Otto-Bliesner

March, 07 2019

Time: 4:00 PM - 5:00 PM
Location: JGB 2.324

UTIG Seminar Series: Sarah Hörst, Johns Hopkins University

March, 08 2019

Time: 10:30 AM - 12:00 PM
Location: PRC ROC Room 1.603

Click to watch online.

Speaker: Sarah Hörst, Johns Hopkins University

Host: Krista Soderlund

UTIG Brown Bag Seminar: Brandon Shuck, UTIG

March, 12 2019

Time: 12:00 PM - 1:00 PM
Location: PRC ROC Room 1.603

Informal weekly presentations by UTIG students and researchers. Bring your lunch!

Speaker: Brandon Shuck, Graduate Research Assistant, UTIG

UTIG Seminar Series: Alexander Evans, Brown University

March, 15 2019

Time: 10:30 AM - 12:00 PM
Location: PRC ROC Room 1.603

Click to watch online.

Speaker: Alexander Evans, Brown University

Host: Krista Soderlund