| 講演要旨(和文) | | マイグレーション実施後に「重合前」データ、すなわち共通イメージ点ギャザーを扱うことにより、マイグレーション後の速度解析、すなわち適用した速度モデルが適切だったかの評価や、いわゆるAVO解析への適用などを実施することが可能である.本報告では波動伝搬に特性曲線法を適用し、その計算過程から伝搬方向を算出することによりマイグレーション後共通アングルギャザー(アングル領域共通イメージ点ギャザー)を作成する手法に関して言及する。 |
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| | 講演要旨(英文) | | Post migration angle domain common image point gathers provide useful data about the sub-surface, such as seismic velocity and amplitude versus offset (AVO) information. However, the disadvantage of shot-profile migration, which is including to reverse time migration, is the difficulty in dealing with common image point gather. In this article, we tried to generate angle domain common image point gather during reverse time migration. Incident angle of seismic wave to reflector is calculated as a half of the angle between the propagation direction of shot wavefield and receiver wavefield. The propagation direction is estimated from special derivative and temporal derivative of pressure field. These derivatives are calculated while wave propagation simulation using characteristic curve method. |
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