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• W2462222731 abstract "요약: 탄성파 자료의 영상화 과정에서 입력자료인 속도 모델에 불연속면이 있는 경우 반사파에 의해 참반사보정(migration) 결과가 왜곡될 수 있다. 따라서 참반사보정을 위한 속도 모델은 지층 경계면에서 샘 파동장과 수신기 파동장을 구할 때 발생하는 반사파를 제거하기 위해 평활화(smoothing)하여 사용하는 것이 일반적이다. 그러나 속도 모델을 평활화할 경우 지층 경계면에서 속도 정보가 달라져 지하구조 영상이 왜곡될 가능성이 있다. 본 연구에서는 이러한 단점을최소화하기 위해 속도가 불연속인 층간의 음향 임피던스를 일정하게 만들어 샘 파동장과 수신기 파동장을 구할 때 발생하는 반사파를 줄이고자 하였다. 음향 임피던스를 일정하게 만들기 위해 속도 차이를 보상하는 가상의 밀도(fake density)를 정의하고 참반사보정에 사용하였다. 음향 임피던스가 모든 층에서 일정할 때, 반사면에서 수직 입사파의 반사계수가영이 되고 반사파가 최소화되어 참반사보정 결과를 향상시킬 수 있다. 이를 검증하기 위해 셀기반 유한차분법을 이용하여 거꿀시간 참반사보정(reverse-time migration) 알고리듬을 구현하였다. 수치예제를 통해 속도 대비가 큰 지층 경계면에서 참반사보정 영상의 품질이 향상되는 것을 확인할 수 있고, 특히 천부 지층에서 성능 개선효과가 큰 것을 관찰할 수 있다.주요어: 참반사보정, 반사파, 음향 임피던스, 가상 밀도, 셀기반 유한차분법Abstract: Migration image can be distorted due to reflected waves in the source and receiver wavefields whendiscontinuities of input velocity model exist in seismic imaging. To remove reflected waves coming from layer interfaces,it is a common practice to smooth the velocity model for migration. If the velocity model is smoothed, however, thesubsurface image can be distorted because the velocity changes around interfaces. In this paper, we attempt to minimizethe distortion by reducing reflection energy in the source and receiver wavefields through acoustic impedancehomogenization. To make acoustic impedance constant, we define fake density model and use it for migration. Whenthe acoustic impedance is constant over all layers, the reflection coefficient at normal incidence becomes zero and theminimized reflection energy results in the improvement of migration result. To verify our algorithm, we implement thereverse-time migration using cell-based finite-difference method. Through numerical examples, we can note that themigration image is improved at the layer interfaces with high velocity contrast, and it shows the marked improvementparticularly in the shallow part. Keywords: Migration, reflection energy, acoustic impedance, fake density, cell-based finite-difference method" @default.
• W2462222731 created "2016-07-22" @default.
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• W2462222731 date "2016-05-31" @default.
• W2462222731 modified "2023-09-27" @default.
• W2462222731 title "Improvement of Reverse-time Migration using Homogenization of Acoustic Impedance" @default.
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• W2462222731 doi "https://doi.org/10.7582/gge.2016.19.2.076" @default.
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