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The relationship of soil-moisture saturation and time-lapse static shifts-An example from the Ketzin pilot site

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Authors
Bergmann, P.
Ivandic, M.
Kashubin, A.
Lüth, S.
Ivanova, A.
Juhlin, Christopher
Date
2014
Type
Conference Paper

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Bergmann, P. and Ivandic, M. and Kashubin, A. and Lüth, S. and Ivanova, A. and Juhlin, C. 2014. The relationship of soil-moisture saturation and time-lapse static shifts-An example from the Ketzin pilot site, in Proceedings of the 76th EAGE Conference and Exhibition 2014: Experience the Energy, Jun 16-19 2014, pp. 712-716. Amsterdam: European Association of Geoscientists & Engineers.
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76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014
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Department of Exploration Geophysics
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Abstract

Changes in the near surface are a major problem for land time-lapse seismic projects. Three seismic surveys at the Ketzin pilot site for CO2 storage in Germany demonstrated the importance of removing the variations in the shallow subsurface by applying spatially variable, relative time shifts to the different vintages prior to 4D interpretation. The main reason for these time shifts is a change in seismic velocities in the ground layer above the water table due to different soil-moisture saturation at the times of acquisition. We compared the variation in precipitation, groundwater level and trace-to-trace time shifts between the baseline and two monitor surveys and revealed that delays in reflected energy are in a qualitative sense, proportional to the moisture content in the soil.