Stephen Slivicki

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Stephen Slivicki
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BSc Geology

Stephen Slivicki graduated with a Bachelor of Science in geology in 2020. His first research internship was at the Lunar Planetary Institute, where he conducted geochemical research on the hydrothermally altered impact melts from the Chicxulub crater. The following year he shifted his focus from geochemistry to geophysics having been accepted as a summer intern for the Incorporated Research Institutions for Seismology (IRIS). He worked at Boise State University (BSU) that summer assisting in a multichannel analysis of surface waves (MASW) for data that was gathered in the Seattle area. The concluding fall semester was spent abroad in Italy at the University of Bologna as an undergraduate research assistant assisting with gravity and horizontal-to-vertical spectral ratio (HVSR) surveys in Bolzano and HVSR and MASW surveys in Irpinia. Stephen is currently pursuing a Masters in geophysics at BSU.

Stephen’s research interests involve examining the Crystal Geyser in southeast Utah and the CO2 charged aquifers the geyser draws from. He is interested in using time-lapse active source seismic data to understand the cycling of CO2 content in the reservoirs as the Crystal Geyser progresses through its eruption cycles. Time-lapse active source is the ideal tool for tackling this problem because the seismic properties of the reservoir rock should change through time as the gas content changes. In addition to the time-lapse component of this research, a deployed 200 seismic nodal array captures passive signals in the area. Stephen also will be studying this dataset to determine if there are passive signals associated with the geyser eruptions or the phase change of CO2 from supercritical to gas phase as it migrates from depth.

2021 SEG Near Surface Research Award Recipient

Time-lapse Active Source Seismic Response of Natural CO2 Gas Migration Through a Shallow Reservoir

Abstractː I propose to monitor natural CO2 gas migration within shallow reservoirs near the Little Grand Wash fault in east-central Utah using time-lapse active source surface seismic data. CO2-charged eruptions from the Crystal Geyser, and CO2 flux measurements along a 2-km length of the fault, show near-continuous outgassing from three or more shallow and independent sandstone reservoirs. Previous pressure, temperature, and microbial borehole studies suggest each reservoir produces a unique set of eruption characteristics, with cycles that repeat every two to four days. The presumed source reservoirs range from 100 to 600 m in depth, and large impedance reservoir boundaries have been seismically imaged in high resolution. Results from a 12-hour pilot study show multi-hour-scale amplitude and travel time changes of first arrival and reflection signals through portions of a geyser eruption cycle. I hypothesize that the first arrival travel time differences resulted from changes in water table elevation within the fault zone. These water elevation changes are likely driven by hydrostatic pressure changes. Furthermore, I hypothesize that reflection amplitude changes at reservoir depths have resulted from migrating CO2. I suggest that these amplitude changes will influence different reflectors as gas migrates through different reservoirs. Integrated with pressure and temperature measurements in the nearby boreholes, I propose a 6-day active source time-lapse field campaign to deploy geophones across the Little Grand Wash fault to systematically test these hypotheses. This field campaign can be conducted with a small field crew and equipment housed at Boise State University.

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Stephen Slivicki
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