Integrated Active and Passive Seismic Monitoring at the Decatur CCS Project

19 Pages Posted: 10 Apr 2019

See all articles by Bettina Goertz-Allmann

Bettina Goertz-Allmann

NORSAR

D. Kühn

NORSAR

K. Iranpour

NORSAR

M. Jordan

World Bank

Benjamin Udo Emmel

SINTEF Energy Research

R. Bauer

Illinois State Geological Survey

V. Oye

NORSAR

S. Greenberg

Illinois State Geological Survey

Abstract

For holistic seismic monitoring of the progressing CO2 plume within the Mt. Simon sandstone reservoir at the Illinois Basin - Decatur CCS project, we aim to integrate passive microseismic data with complementary surface- and VSP data from active seismic surveys. A detailed microseismic analysis allows for spatial mapping of attenuation Q around the injection area. We identify time periods of possible reservoir changes in between active seismic time-lapse monitors and we can increase the temporal resolution of the 4D signal. In addition, finite-difference FD modeling of microseismic events can help explain the details of the observed waveforms including different phase arrivals for up- and downgoing waves. This, in turn, is essential to improve the depth resolution of microseismic event location and determine whether seismic activity is confined to the injection zone or growing outward. The discrimination of ray paths from FD modelling also allows to select the most relevant waveform phases for 4D time-lapse studies and is an important pre-processing step. In combination with simultaneous tomographic inversion of the velocity- and attenuation structure, it has the potential to maximize the resolution of 4D changes in the medium.

Keywords: Monitoring: geophysical methods, GHGT-14

Suggested Citation

Goertz-Allmann, Bettina and Kühn, D. and Iranpour, K. and Jordan, M. and Emmel, Benjamin Udo and Bauer, R. and Oye, V. and Greenberg, S., Integrated Active and Passive Seismic Monitoring at the Decatur CCS Project. 14th Greenhouse Gas Control Technologies Conference Melbourne 21-26 October 2018 (GHGT-14) , Available at SSRN: https://ssrn.com/abstract=3365916 or http://dx.doi.org/10.2139/ssrn.3365916

D. Kühn

NORSAR

Kjeller
Norway

K. Iranpour

NORSAR

Kjeller
Norway

M. Jordan

World Bank

1818 H Street, NW
Washington, DC 20433
United States

Benjamin Udo Emmel

SINTEF Energy Research

Kolbjørn Hejes vei 1A
Trondheim, NO-7034
Norway

R. Bauer

Illinois State Geological Survey

615 E Peabody Dr
Champaign, IL 61820
United States

V. Oye

NORSAR

Kjeller
Norway

S. Greenberg

Illinois State Geological Survey

615 E Peabody Dr
Champaign, IL 61820
United States

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