| 講演要旨(和文) | | １次元フォワードモデリングを用いてMH混合層と非MH層との組成比や、thin-layerの厚さを変化しながら、モデルの生成と減衰値の算出を繰り返し、貯留層でMH層の組成比や厚さによる減衰値の変化を確率統計的に検討した。 |
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| | 講演要旨(英文) | | To clarify the attenuation properties in methane hydrate-bearing sediments, we estimated seismic attenuation from reflection seismic data acquired at Nankai Trough. We could observe high attenuation in methane hydrate-bearing sediments over the BSR region. This result may be due to tuning or thin-layering effect in inhomogeneously layered methane hydrate reservoir. In our previous study, both the seismic amplitude and the peak frequency are changed under tuning condition, and these results also influenced on the attenuation results. In this study, we carried out a seismic 1D forward modeling to see how thin-layering effect influences on seismic attenuation estimation. We simulated 500 realizations of randomly layered models for fixed MH/non-MH layers ratio. |
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