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2011 Vol.48, Issue 4
Prestack Reverse Time Migration for Vertical Transversely Isotropic Media

횡적등방성 매질에서 중합전 역시간 구조보정

Doan Huy Hien, 장성형

Doan Huy Hien and Seonghyung Jang

31 August 2011. pp. 407-419
PDF Citation
Abstract
Reverse Time Migration (RTM) is a method for imaging subsurface using crosscorrelation between source wavefields extrapolation in forward and recorded receiver wavefields extrapolation in backward. RTM is widely used for complex subsurface structures in isotropic media. However, since the earth interior is intrinsically anisotropy, we need to consider anisotropic problem for migration. In this study we developed two RTM algorithms in vertical transversely isotropic (VTI) media. The one is the inner product of the partial derivative wavefields and observed wavefields, the other is the inner product of the virtual source and back propagation wavefields. Numerical model test for a simple anisotropic geological model shows that the results from two algorithms are almost the same to each other. This means that the latter one is more effective than the first one. We can apply the VTI RTM to complex geological structures with horizontal velocity variations in VTI media without calculation of partial derivative wavefields.
Keywords
VTI
Prestack depth migration
Reverse time migration
Shot domain
Receiver domain
역시간 구조보정은 음원영역 파동장 외삽과 수진기영역 파동장 외삽의 상호상관으로 지층구조를 영상화하는 방법으로 복잡한 등방성 매질 층서구조를 영상화하는데 주로 이용된다. 그러나 일반적으로 지구내부 지층구조는 이방성 특성을 지니고 있으므로 이방성을 고려한 구조보정 기술이 필요하다. 여기에서는 편미분 파동장과 음원모음의 내적에 의한 알고리즘과 가상음원과 역전파 파동장과의 내적에 의한 알고리즘을 이용하여 횡적등방성 매질에서 역시간 구조보정 기술을 개발하고자 하였다. 단순 이방성 지층모델에 대한 수치모형실험 결과, 두 가지 방법에 의한 지층단면도 영상은 거의 차이가 없어 가상음원과 역전파 파동장과의 내적으로 구조보정을 실시하는 것이 효과적임을 알 수 있었다. 수평적으로 속도가 변하는 이방성 매질 지층구조에서 편미분 파동장을 구하지 않고 영상화 할 수 있음을 알 수 있었다.
키워드
횡적등방성 매질
중합전 심도 구조보정
역시간 구조보정
음원영역
수진기영역
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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 for Geosystem Engineering
  • Journal Title(Ko) :한국지구시스템공학회지
  • Volume : 48
  • No :4
  • Pages :407-419
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