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Quantitative CO2 saturation estimation from time lapse sonic logs by consideration of uniform and patchy saturation by Hiroyuki Azuma; Chisato Konishi; Dai Nobuoka; Zique Xue; Jiro Watanabe is a Engineering article available to read on EtoBox.

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An appropriate assumption of gas saturation state is very important to estimate CO 2 saturation from P-wave velocity changes. By careful observation of velocity and porosity logs, we found that P-wave velocity decrease gradually with increasing CO 2 saturation, although the P-wave velocity should decrease rapidly at very small CO 2 saturation in the case of uniform saturation. Thus we expected that the CO 2 saturation state in pore space is patchy or heterogeneous saturation. Furthermore existence of critical saturation was expected from the log data. In order to confirm our idea, we calculated theoretical curves of the relation between velocity and CO 2 saturation for each saturation state, uniform, patchy, and the heterogeneous saturation expressed by Brie's equation using rock physics modelling. In this study, we use Friable-sand model (Dvorkin and Nur, 1996) for dry frame and grain bulk and shear modulus are calculated by Hill's average of quartz and clay. Additionally, we employed the critical saturation and modified each saturation equation using this critical saturation. Comparing the data and theoretical curves, we confirmed that the curves for patchy saturation or heteroge

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Author

Hiroyuki Azuma; Chisato Konishi; Dai Nobuoka; Zique Xue; Jiro Watanabe

Publisher

Elsevier ; Elsevier BV (ISSN 1876-6102)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)