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Estimation of Anisotropy Parameters, delta and epsilon: An Application to Borehole and Seismic Data from Ketzin, Germany
Chiang Mai Univ, Dept Geol Sci, Chiang Mai 50200, Thailand..
Chiang Mai Univ, Dept Geol Sci, Chiang Mai 50200, Thailand..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Chiang Mai Univ, Dept Geol Sci, Chiang Mai 50200, Thailand..
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2016 (English)In: CHIANG MAI JOURNAL OF SCIENCE, ISSN 0125-2526, Vol. 43, no 6, 1299-1305 p.Article in journal (Refereed) Published
Abstract [en]

Weak anisotropy was indicated in a previous investigation of the 3D baseline seismic data acquired through the EU funded CO2 SINK project at the Ketzin pilot site for CO2 storage, Germany. Fourth order velocity analysis yielded the Alkhalifah anellipticity factor, or eta (eta), ranging from -0.2399 to 0.1341 for the whole study area. Although application of the simple eta term in the moveout correction allowed reflections to be flattened at far offsets, resulting in an improved seismic stacked section, the Thomsen parameters, delta (delta) and epsilon (epsilon) are of greater interest from a rock physics perspective. Borehole data from Ketzin were introduced to estimate delta and epsilon using known relationships between sonic wave velocity, NMO velocity, eta,delta and epsilon. In this paper, delta and epsilon estimations were performed using data from three wells; the CO2 injection well and two observation wells. Preliminary estimates of the Thomsen parameters give delta ranging from -0.2658 to -0.1270, while epsilon ranges from -0.2611 to -0.1141. These delta and epsilon values also indicate the presence of weak vertical transverse isotropy at the site, which is consistent with the previous study.

Place, publisher, year, edition, pages
CHIANG MAI UNIV , 2016. Vol. 43, no 6, 1299-1305 p.
Keyword [en]
seismic anisotropy, borehole, reflection, Ketzin
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-321275ISI: 000395907600009OAI: oai:DiVA.org:uu-321275DiVA: diva2:1092372
Conference
7th International Conference on Applied Geophysics (Geophysics), JAN 14-15, 2016, Bangkok, THAILAND
Funder
EU, European Research Council, 502599
Available from: 2017-05-02 Created: 2017-05-02 Last updated: 2017-05-02Bibliographically approved

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