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2020 Vol.57, Issue 1 Preview Page

Technical Report

Parallel Elastic wave Modeling Considering the Effects of Orthorhombic Anisotropy

사방정계 형태의 이방성을 고려한 병렬 탄성파 모델링 연구

Ju-Won Oh1*
오 주원1*
1전북대학교 자원․에너지공학과
* Corresponding Author
29 February 2020. pp. 86-96
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Abstract

Orthorhombic anisotropy is a practical model to understand the propagation of seismic waves through the real Earth. In this study, I propose an efficient three-dimensional (3D) parallel elastic wave modeling algorithm, which takes into consideration complex orthorhombic anisotropy. First, the geological background of seismic anisotropy in the sedimentary basin was assessed, and then the influence of anisotropic parameters was analyzed according to the phase velocities of P-, SV-, and SH-waves in the orthorhombic media. To develop a parallel elastic modeling algorithm considering the effects of orthorhombic anisotropy, a staggered-grid finite difference method with domain decomposition was utilized. To verify the accuracy and efficiency of the orthorhombic modeling algorithm, I compared numerical wavefields with an analytic wavefront and performed a scalability test. Finally, the orthorhombic elastic modeling is employed in a modified, 3D SEG/EAGE overthrust model to determine the applicability of the algorithm to the complex model.

Keywords
Seismic modeling
orthorhombic anisotropy
message-passing interface
high-performance computing

사방정계 형태의 이방성 매질은 퇴적분지에서 나타날 수 있는 현실적인 이방성 모델로, 이 연구에서는 복잡한 사방정계 형태의 이방성을 고려할 수 있는 효율적인 3차원 병렬 모델링 알고리듬을 제안한다. 사방정계 형태의 이방성은 셰일층의 이방성, 파장에 비해 얇은 지층의 교호, 수직적으로 배열된 방향성을 갖는 균열망이 복합적으로 존재할 때 나타날 수 있으며, 각각의 원인에 대한 지질학적인 근거를 제시하고자 하였다. 다음으로 기존의 연구결과를 토대로 사방정계 이방성 매질에서의 전파 방향에 따른 P파, SV파, SH파의 위상속도 분석을 통하여 이방성 변수가 사방정계 매질에서의 파동 전파에 미치는 영향을 논의하였다. 사방정계 형태의 이방성을 고려한 탄성파 모델링 알고리듬을 개발하기 위하여 먼저 3차원 탄성 파동방정식을 엇격자 유한차분법을 이용하여 수치해석적으로 계산하였고, 멀티코어를 활용한 영역분할법을 이용하여 알고리듬을 병렬화하였다. 알고리듬의 정확성 검증을 위하여 균질한 사방정계 이방성 모델에 대한 수치모델링을 수행하고 그 결과를 P, SV, SH파의 위상속도에 대한 이론해와 비교하였다. 또한 확장성 실험을 통해 멀티코어 환경에서의 병렬 모델링 알고리듬의 효율성을 검토하였다. 마지막으로 3차원 SEG/EAGE 오버스러스트 모델에 대해 개발된 알고리듬을 적용함으로써, 복잡한 사방정계 이방성 모델에 대한 적용성을 검토하였다.

키워드
탄성파 모델링
사방정계 이방성
MPI
고성능컴퓨팅
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 57
  • No :1
  • Pages :86-96
  • Received Date : 2019-12-31
  • Revised Date : 2020-01-22
  • Accepted Date : 2020-02-21
  • DOI :https://doi.org/10.32390/ksmer.2020.57.1.086
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