플럭스 보정기법을 이용한 병렬 3차원 탄성파 모델링 연구
A Study on Parallel 3D Elastic Wave Modeling Using Flux-corrected Transport
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초록
본 연구에서는 대규모 3차원 해저면 탐사자료 구현을 위한 효율적인 병렬 3차원 탄성파 모델링 알고리듬을 제안한다. 제안된 병렬 탄성파 모델링 기술은 다중노드-다중코어 클러스터 환경에서 영역분할법 기반의 고성능 컴퓨팅 기술을 기반으로 3차원 탄성파동방정식의 수치해를 계산하고, 플럭스 보정기법을 적용하여 상대적으로 큰 공간격자를 사용하더라도 P파와 S파의 운동학적 특성(도달시간)을 정확하게 구현할 수 있다는 장점이 있어서 대규모 3차원 다성분 해저면 탐사자료를구현하기에 적합하다. 2차원 모델에 대해서 플럭스 보정기법의 원리를 소개하고, 3차원 2층 모델에대한 적용성을 검토하였다. 마지막으로 북해 볼브 유전 지역의 속도 모델에 대해 제안한 기술을 적용함으로써 대규모 3차원 해저면 탐사자료 구현에 활용가능한지 검토하였다.
Abstract
In this study, we propose an efficient parallel 3D elastic wave modeling algorithm that is suitable for simulating large-scale 3D ocean-bottom seismic data. The proposed parallel 3D seismic modeling algorithm, which is based on domain decomposition using high-performance computing techniques in multi-node and multi-core cluster environments, can provide numerical solutions efficiently. By integrating flux-corrected transport in parallel 3D elastic wave modeling, our algorithm provides kinematically reliable S-wave motions with less numerical dispersions using larger grid sampling, which enables simulating large-scale 3D elastic wave propagations. We first demonstrate the mechanism of the flux-corrected transport in 2D elastic wave propagation and then extend the proposed methods to large-scale 3D elastic problems on a two-layered model. Finally, we verify the applicability of the proposed algorithm to a more realistic 3D elastic Earth model constructed from the Volve oilfield in the North Sea.
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