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| | Abstract | | Time-lapse data processing flow was applied to 4-components seismic data sets obtained before and after the flow test in the 2nd offshore methane hydrate production test in the Eastern Nankai Trough. As the methane hydrate in sediments undergoes dissociation into water and gas, P-wave and S-wave velocity in sediments decrease. These velocity decreases are predicted to cause the changes in seismic images. In order to evaluate changes of physical properties caused to methane hydrate dissociation, a good repeatability in time-lapse data sets should be required. Integration of some approaches including 4D-binning, 4D-amplitude balancing and other methods was useful for suppressing non-repeatable noise and enhancing 4D signal. |
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